I don't know why but I ordered another V6 board - I now have four, this is a sickness... :-\? HF signals must finally have all of the kinks worked out as I cabled it up and immediately had a working radio!? This is the first one that I didn't have to to any alignments to!? :-)
I plan on? leaving this one with the original screen and using a different alternative firmware that does not require a Nextion display.
73,
Justin B.
|
Re: Easy 20 Watts with any qrp
#bitx40
Well, I "paid my dues" in the homebrew department over 50 years
ago.? A world war 2 ARC-5 TVI generator for the PA tube &
socket, an old TV set for its power transformer, plate loading
coil wound on a plastic pill vial, an old auto air filter gave the
perforated metal for the PA tube compartment cover, I'm sure you
get the picture.? I stick to operating these days & let the
younger folks do the design & building.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-28 00:43, Siegfried
Jackstien wrote:
toggle quoted message
Show quoted text
yes .. rs918 is mchf clone
but it was our group that included freedv in mchf and it WAS ME
WHO HAD THE IDEA!!
dg9bfc sigi
Am 28.03.2023 um 00:49 schrieb Gerald
Sherman:
The RS918 is the Chinese copy of M0NKA's McHF.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-27 18:40, Siegfried
Jackstien wrote:
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest
is history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have
found out that the freedv hardware solution .. smartmic ..
sm1000 .. has an stm32 chip and the mchf also has that stm32
inside ... then i brought david rove in contact of our user
group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb
Ashhar Farhan:
The digital voice mode that could possibly
replace ssb is freedv. It is actually two things that work
together.
First, the voice is converted into a
stream of very few bits per second. A usual voice stream
like that of telephone uses about 64,000 bits per
second. Freedv codec reduces it to 700 bits per second.
This is at the cost of reduced quality. However, it is
much better that SSB on 80 meters.
The second thing is an HF modem that can
work at 700 bits per second. This is a weird one. On HF
as signals bounce off the ionosphere and arrive at the
rx antenna, you can have a situation where the same
signal can arrive taking different paths and hence at
different times , overlapping itself. This reduces the
number of times you can rapidly change the frequency of
the signal. This is why FT8 works so well, it is so slow
that fading, et al doesnt affect it. So, what the freedv
modem does is that it transmits a number of parallel ft8
like signals as separate tones within the same audio
which when added up give you higher bandwidth. There is
a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx,
making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat
had an article how students in England were
fascinated by Morse code. When asked why, they
replied that "voice" (SSB) didn't interest them
because they could do that with their cell phone.
But Morse was "better" because their parents
couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have
observed some thing very fascinating among
middle schoolers in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF
radios
Don¡¯t even get me thinking about
digital.
What they absolutely go crazy over,
what they will grab onto and play with
until you have to pull them away kicking
and screaming with their parents,
Is a Morse code key!!!
At every school open house that we hold
we now always provide multiple Morse code
keys and it is a big draw.
We will provide them at this year¡®s
field day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10
words per minute. I sent 30 minutes worth
of code to them two weeks ago?
It is astonishing the attraction that
Morse code has for these middle schoolers
Meanwhile, across town, at the school
devoted to future police and fire high
schoolers, they have an extremely active
contesting high school I am radio club and
I am told that their best operator can do
over 30 words per minute and they
routinely make hundreds and hundreds of
contacts at voice and CW in contests. ?
Our local ham radio club would have a
hard time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain
number of us who really love the auditory
and tactile tickling that only Morse code
gives¡. And by the way it is the first
digital, the only digital that can be
decoded by the human brain without much
else.? End it enjoys an order of magnitude
or two advantage over voice In terms of
threshold signal to noise ratio!!!?
On Mar 26, 2023,
at 13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both
CW old timers.? So far we have lost
about half of the CW people without any
real replacements coming along, but you
and I came along during a certain era.
Best wishes.? ? ?
?73, Dan
Eventually there will be something that
replaces analog single side band voice.
But it¡¯s not yet here. ? And I think I
have been doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26,
2023, at 11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have
been sending Morse code now for
57 years, and I will just
continue to send Morse code, but
since you seem to be very
knowledgeable is there a digital
voice modulation system that
will eventually replace SSB?
Thank
you.? ? ? ? ? 73, Dan, N7DE?
Single side band typically
requires a 10 DB signal to noise
ratio for useful communications in
a disaster.? That is, the
efficient transfer of information
My contrast, using the same
base noise in that bandwidth,
data communications of moderate
speed can tolerate SNR into low
single digits, and still move
efficient communications far
faster than voice
Low data rate redundant
digital communications can
tolerate signal to noise ratios
a couple orders of magnitude
lower SNR
These comparisons are widely
available
It¡¯s no secret why people who
are very involved in the (voice)
national traffic system often
have kilowatt amplifiers. ?
And people who are into JS8
?don¡¯t need them
So there are different
requirements for different parts
of our hobby
On Mar
26, 2023, at 11:33, Dan
Eggers N7DE <N7DE@...>
wrote:
?
I
used 20 watts for a long
time, and I have had a
number of people refuse
to talk to me, because
my signal was too week,
so more power is
needed.? I have written
a booklet about solar
cells, and maybe you use
solar cells and power
conversion, and that is
also a very interesting
area, but I also want to
be able to talk to
people.
?
? ? 73, Dan, N7DE? ?
With respect, Dan,
"need" isn't an actionable
or useful concept,
especially in QRP land.
I live on a sailboat and
am currently in Tampa Bay.
With a couple of meters of
tinn
On Sat, Mar 25, 2023 at
01:55 PM, Dan Eggers N7DE
wrote:
20 w is -7 dB, and that is too far down.? it is
getting close to -10
dB down.? You need
to be at 50 w, and
that is only -3 dB
down.? What I have
used for low cost
has been an MRF455
in an EB63A board
from Communications
Concepts, and it
works very well.
?
However, the Chinese are selling a 100-w
amplifier with a
heatsink that has
had the level set,
and they also sell a
lowpass filter board
XDT LPF200 for 3 -
30 MHz at a
reasonable price
that works very
well, so these days
there really isn't
any reason to "build
your own"
amplifier.?
?
The main thing I am saying is that you need more
power so that you
can be heard.? I
went through enough
Electrical
Engineering courses
that I am now an
Electrical Engineer,
but I do not think I
am going to try
design amplifiers
from scratch myself.
?
I am very grateful for all of the people who
helped produce the
UBITX 6, because I
think that has been
the only low cost
real general
coverage transceiver
that is out there.?
? ? ? ? ? ?73, Dan,
N7DE
?
Hi Ted
Thanks. Incidentally
the FET is? IRFP150?
And Not IRF150 , sorry
for the typo.
I will edit at the end
of the video..
The FET i have used is
Harris IRFP 150
It works great with
not much heat at 35 V
.
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: Easy 20 Watts with any qrp
#bitx40
yes .. rs918 is mchf clone
but it was our group that included freedv in mchf and it WAS ME
WHO HAD THE IDEA!!
dg9bfc sigi
Am 28.03.2023 um 00:49 schrieb Gerald
Sherman:
toggle quoted message
Show quoted text
The RS918 is the Chinese copy of M0NKA's McHF.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-27 18:40, Siegfried
Jackstien wrote:
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest
is history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have
found out that the freedv hardware solution .. smartmic ..
sm1000 .. has an stm32 chip and the mchf also has that stm32
inside ... then i brought david rove in contact of our user
group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb
Ashhar Farhan:
The digital voice mode that could possibly
replace ssb is freedv. It is actually two things that work
together.
First, the voice is converted into a stream
of very few bits per second. A usual voice stream like
that of telephone uses about 64,000 bits per second.
Freedv codec reduces it to 700 bits per second. This is at
the cost of reduced quality. However, it is much better
that SSB on 80 meters.
The second thing is an HF modem that can
work at 700 bits per second. This is a weird one. On HF as
signals bounce off the ionosphere and arrive at the rx
antenna, you can have a situation where the same signal
can arrive taking different paths and hence at different
times , overlapping itself. This reduces the number of
times you can rapidly change the frequency of the signal.
This is why FT8 works so well, it is so slow that fading,
et al doesnt affect it. So, what the freedv modem does is
that it transmits a number of parallel ft8 like signals as
separate tones within the same audio which when added up
give you higher bandwidth. There is a very impressive name
for it that escapes me now.
Our plan is to add freedv into the sbitx,
making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated
by Morse code. When asked why, they replied that
"voice" (SSB) didn't interest them because they
could do that with their cell phone. But Morse was
"better" because their parents couldn't understand
what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have
observed some thing very fascinating among
middle schoolers in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF
radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what
they will grab onto and play with until you
have to pull them away kicking and screaming
with their parents,
Is a Morse code key!!!
At every school open house that we hold
we now always provide multiple Morse code
keys and it is a big draw.
We will provide them at this year¡®s field
day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words
per minute. I sent 30 minutes worth of code
to them two weeks ago?
It is astonishing the attraction that
Morse code has for these middle schoolers
Meanwhile, across town, at the school
devoted to future police and fire high
schoolers, they have an extremely active
contesting high school I am radio club and I
am told that their best operator can do over
30 words per minute and they routinely make
hundreds and hundreds of contacts at voice
and CW in contests. ?
Our local ham radio club would have a
hard time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain
number of us who really love the auditory
and tactile tickling that only Morse code
gives¡. And by the way it is the first
digital, the only digital that can be
decoded by the human brain without much
else.? End it enjoys an order of magnitude
or two advantage over voice In terms of
threshold signal to noise ratio!!!?
On Mar 26, 2023,
at 13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW
old timers.? So far we have lost about
half of the CW people without any real
replacements coming along, but you and I
came along during a certain era.
Best wishes.? ? ?
?73, Dan
Eventually there will be something that
replaces analog single side band voice. But
it¡¯s not yet here. ? And I think I have been
doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023,
at 11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57
years, and I will just continue to
send Morse code, but since you
seem to be very knowledgeable is
there a digital voice modulation
system that will eventually
replace SSB?
Thank you.?
? ? ? ? 73, Dan, N7DE?
Single side band typically requires
a 10 DB signal to noise ratio for
useful communications in a
disaster.? That is, the efficient
transfer of information
My contrast, using the same
base noise in that bandwidth, data
communications of moderate speed
can tolerate SNR into low single
digits, and still move efficient
communications far faster than
voice
Low data rate redundant digital
communications can tolerate signal
to noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who
are very involved in the (voice)
national traffic system often have
kilowatt amplifiers. ?
And people who are into JS8
?don¡¯t need them
So there are different
requirements for different parts
of our hobby
On Mar
26, 2023, at 11:33, Dan Eggers
N7DE <N7DE@...>
wrote:
?
I
used 20 watts for a long
time, and I have had a
number of people refuse to
talk to me, because my
signal was too week, so
more power is needed.? I
have written a booklet
about solar cells, and
maybe you use solar cells
and power conversion, and
that is also a very
interesting area, but I
also want to be able to
talk to people.
? ?
? 73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or
useful concept, especially
in QRP land.
I live on a sailboat and am
currently in Tampa Bay. With
a couple of meters of tinn
On Sat, Mar 25, 2023 at
01:55 PM, Dan Eggers N7DE
wrote:
20
w is -7 dB, and that
is too far down.? it
is getting close to
-10 dB down.? You need
to be at 50 w, and
that is only -3 dB
down.? What I have
used for low cost has
been an MRF455 in an
EB63A board from
Communications
Concepts, and it works
very well.
?
However,
the Chinese are
selling a 100-w
amplifier with a
heatsink that has had
the level set, and
they also sell a
lowpass filter board
XDT LPF200 for 3 - 30
MHz at a reasonable
price that works very
well, so these days
there really isn't any
reason to "build your
own" amplifier.?
?
The
main thing I am saying
is that you need more
power so that you can
be heard.? I went
through enough
Electrical Engineering
courses that I am now
an Electrical
Engineer, but I do not
think I am going to
try design amplifiers
from scratch myself.
?
I
am very grateful for
all of the people who
helped produce the
UBITX 6, because I
think that has been
the only low cost real
general coverage
transceiver that is
out there.? ? ? ? ? ?
?73, Dan, N7DE
?
Hi Ted
Thanks. Incidentally the
FET is? IRFP150? And Not
IRF150 , sorry for the
typo.
I will edit at the end
of the video..
The FET i have used is
Harris IRFP 150
It works great with not
much heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: Easy 20 Watts with any qrp
#bitx40
I thought that I could do everything myself when we were working with vacuum tubes, and when transistors came along early on it seemed like you could still do things yourself, but now with integrated circuits
and firmware it is impossible to do everything yourself.? That is why I am grateful for all of you.
? ? ? ? ?73, Dan, N7DE
toggle quoted message
Show quoted text
Sigi,
What a fun way to do it. It is so much more enlightening when you have a bunch of friends to do it with.
?I wish we could dumb down an ssb radio to the point that people with soldering skills could sit down with a bag of parts and solder it up over a few evenings. That was my attempt with the original bitx20. However, we seem to be moving to more
and more complex radios that work less and less transparently.
Yesterday, while trying to debug a pesky problem on the new sbitx, I was cursing myself for not understanding how it works (after working on it for 4 years)...
On Tue, Mar 28, 2023, 4:19 AM Gerald Sherman < ve4gks@...> wrote:
The RS918 is the Chinese copy of M0NKA's McHF.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-27 18:40, Siegfried Jackstien wrote:
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest is history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However,
it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths
and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that
it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better"
because their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.
They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,
Is a Morse code key!!!
At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of someone sending Morse code
We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?
It is astonishing the attraction that Morse code has for these middle schoolers
Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make
hundreds and hundreds of contacts at voice and CW in contests. ?
Our local ham radio club would have a hard time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives¡. And by the way it is the first digital, the only digital that can be decoded by
the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?
On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:
?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.
Best wishes.? ? ? ?73, Dan
Eventually there will be something that replaces analog single side band voice. But it¡¯s not yet here. ? And I think I have been doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:
?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?
Thank you.? ? ? ? ? 73, Dan, N7DE?
Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information
My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice
Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR
These comparisons are widely available
It¡¯s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?
And people who are into JS8 ?don¡¯t need them
So there are different requirements for different parts of our hobby
On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:
?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power
conversion, and that is also a very interesting area, but I also want to be able to talk to people.
? ? ? 73, Dan, N7DE? ?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.
I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts,
and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really
isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers
from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
It should tune in 0.05 (50 Hz) increments.? ?I'm running my modified code on my v6.1, but I didn't change the increment in the stock software, and mine does 0.05 increments.? ?If you want to modify code, the increment could be changed to 0.01.
|
Re: Easy 20 Watts with any qrp
#bitx40
Sigi, What a fun way to do it. It is so much more enlightening when you have a bunch of friends to do it with. ?I wish we could dumb down an ssb radio to the point that people with soldering skills could sit down with a bag of parts and solder it up over a few evenings. That was my attempt with the original bitx20. However, we seem to be moving to more and more complex radios that work less and less transparently. Yesterday, while trying to debug a pesky problem on the new sbitx, I was cursing myself for not understanding how it works (after working on it for 4 years)...
On Tue, Mar 28, 2023, 4:19 AM Gerald Sherman < ve4gks@...> wrote:
The RS918 is the Chinese copy of M0NKA's McHF.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-27 18:40, Siegfried
Jackstien wrote:
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest is
history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have found
out that the freedv hardware solution .. smartmic .. sm1000 ..
has an stm32 chip and the mchf also has that stm32 inside ...
then i brought david rove in contact of our user group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb Ashhar
Farhan:
The digital voice mode that could possibly
replace ssb is freedv. It is actually two things that work
together.
First, the voice is converted into a stream of
very few bits per second. A usual voice stream like that of
telephone uses about 64,000 bits per second. Freedv codec
reduces it to 700 bits per second. This is at the cost of
reduced quality. However, it is much better that SSB on 80
meters.
The second thing is an HF modem that can work
at 700 bits per second. This is a weird one. On HF as
signals bounce off the ionosphere and arrive at the rx
antenna, you can have a situation where the same signal can
arrive taking different paths and hence at different times ,
overlapping itself. This reduces the number of times you can
rapidly change the frequency of the signal. This is why FT8
works so well, it is so slow that fading, et al doesnt
affect it. So, what the freedv modem does is that it
transmits a number of parallel ft8 like signals as separate
tones within the same audio which when added up give you
higher bandwidth. There is a very impressive name for it
that escapes me now.
Our plan is to add freedv into the sbitx,
making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated by
Morse code. When asked why, they replied that "voice"
(SSB) didn't interest them because they could do that
with their cell phone. But Morse was "better" because
their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed
some thing very fascinating among middle
schoolers in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what
they will grab onto and play with until you
have to pull them away kicking and screaming
with their parents,
Is a Morse code key!!!
At every school open house that we hold we
now always provide multiple Morse code keys
and it is a big draw.
We will provide them at this year¡®s field
day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words
per minute. I sent 30 minutes worth of code to
them two weeks ago?
It is astonishing the attraction that Morse
code has for these middle schoolers
Meanwhile, across town, at the school
devoted to future police and fire high
schoolers, they have an extremely active
contesting high school I am radio club and I
am told that their best operator can do over
30 words per minute and they routinely make
hundreds and hundreds of contacts at voice and
CW in contests. ?
Our local ham radio club would have a hard
time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain
number of us who really love the auditory and
tactile tickling that only Morse code gives¡.
And by the way it is the first digital, the
only digital that can be decoded by the human
brain without much else.? End it enjoys an
order of magnitude or two advantage over voice
In terms of threshold signal to noise
ratio!!!?
On Mar 26, 2023, at
13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW
old timers.? So far we have lost about half
of the CW people without any real
replacements coming along, but you and I
came along during a certain era.
Best wishes.? ? ?
?73, Dan
Eventually there will be something that
replaces analog single side band voice. But
it¡¯s not yet here. ? And I think I have been
doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023,
at 11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57 years,
and I will just continue to send
Morse code, but since you seem to be
very knowledgeable is there a
digital voice modulation system that
will eventually replace SSB?
Thank you.? ?
? ? ? 73, Dan, N7DE?
Single side band typically requires a
10 DB signal to noise ratio for useful
communications in a disaster.? That
is, the efficient transfer of
information
My contrast, using the same base
noise in that bandwidth, data
communications of moderate speed can
tolerate SNR into low single digits,
and still move efficient
communications far faster than voice
Low data rate redundant digital
communications can tolerate signal
to noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who are
very involved in the (voice)
national traffic system often have
kilowatt amplifiers. ?
And people who are into JS8
?don¡¯t need them
So there are different
requirements for different parts of
our hobby
On Mar 26,
2023, at 11:33, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I
used 20 watts for a long
time, and I have had a
number of people refuse to
talk to me, because my
signal was too week, so more
power is needed.? I have
written a booklet about
solar cells, and maybe you
use solar cells and power
conversion, and that is also
a very interesting area, but
I also want to be able to
talk to people.
? ? ?
73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or useful
concept, especially in QRP
land.
I live on a sailboat and am
currently in Tampa Bay. With a
couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55
PM, Dan Eggers N7DE wrote:
20
w is -7 dB, and that is
too far down.? it is
getting close to -10 dB
down.? You need to be at
50 w, and that is only
-3 dB down.? What I have
used for low cost has
been an MRF455 in an
EB63A board from
Communications Concepts,
and it works very well.
?
However,
the Chinese are selling
a 100-w amplifier with a
heatsink that has had
the level set, and they
also sell a lowpass
filter board XDT LPF200
for 3 - 30 MHz at a
reasonable price that
works very well, so
these days there really
isn't any reason to
"build your own"
amplifier.?
?
The
main thing I am saying
is that you need more
power so that you can be
heard.? I went through
enough Electrical
Engineering courses that
I am now an Electrical
Engineer, but I do not
think I am going to try
design amplifiers from
scratch myself.
?
I
am very grateful for all
of the people who helped
produce the UBITX 6,
because I think that has
been the only low cost
real general coverage
transceiver that is out
there.? ? ? ? ? ? ?73,
Dan, N7DE
?
Hi Ted
Thanks. Incidentally the
FET is? IRFP150? And Not
IRF150 , sorry for the
typo.
I will edit at the end of
the video..
The FET i have used is
Harris IRFP 150
It works great with not
much heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: Easy 20 Watts with any qrp
#bitx40
The RS918 is the Chinese copy of M0NKA's McHF.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-27 18:40, Siegfried
Jackstien wrote:
toggle quoted message
Show quoted text
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest is
history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have found
out that the freedv hardware solution .. smartmic .. sm1000 ..
has an stm32 chip and the mchf also has that stm32 inside ...
then i brought david rove in contact of our user group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb Ashhar
Farhan:
The digital voice mode that could possibly
replace ssb is freedv. It is actually two things that work
together.
First, the voice is converted into a stream of
very few bits per second. A usual voice stream like that of
telephone uses about 64,000 bits per second. Freedv codec
reduces it to 700 bits per second. This is at the cost of
reduced quality. However, it is much better that SSB on 80
meters.
The second thing is an HF modem that can work
at 700 bits per second. This is a weird one. On HF as
signals bounce off the ionosphere and arrive at the rx
antenna, you can have a situation where the same signal can
arrive taking different paths and hence at different times ,
overlapping itself. This reduces the number of times you can
rapidly change the frequency of the signal. This is why FT8
works so well, it is so slow that fading, et al doesnt
affect it. So, what the freedv modem does is that it
transmits a number of parallel ft8 like signals as separate
tones within the same audio which when added up give you
higher bandwidth. There is a very impressive name for it
that escapes me now.
Our plan is to add freedv into the sbitx,
making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated by
Morse code. When asked why, they replied that "voice"
(SSB) didn't interest them because they could do that
with their cell phone. But Morse was "better" because
their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed
some thing very fascinating among middle
schoolers in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what
they will grab onto and play with until you
have to pull them away kicking and screaming
with their parents,
Is a Morse code key!!!
At every school open house that we hold we
now always provide multiple Morse code keys
and it is a big draw.
We will provide them at this year¡®s field
day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words
per minute. I sent 30 minutes worth of code to
them two weeks ago?
It is astonishing the attraction that Morse
code has for these middle schoolers
Meanwhile, across town, at the school
devoted to future police and fire high
schoolers, they have an extremely active
contesting high school I am radio club and I
am told that their best operator can do over
30 words per minute and they routinely make
hundreds and hundreds of contacts at voice and
CW in contests. ?
Our local ham radio club would have a hard
time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain
number of us who really love the auditory and
tactile tickling that only Morse code gives¡.
And by the way it is the first digital, the
only digital that can be decoded by the human
brain without much else.? End it enjoys an
order of magnitude or two advantage over voice
In terms of threshold signal to noise
ratio!!!?
On Mar 26, 2023, at
13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW
old timers.? So far we have lost about half
of the CW people without any real
replacements coming along, but you and I
came along during a certain era.
Best wishes.? ? ?
?73, Dan
Eventually there will be something that
replaces analog single side band voice. But
it¡¯s not yet here. ? And I think I have been
doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023,
at 11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57 years,
and I will just continue to send
Morse code, but since you seem to be
very knowledgeable is there a
digital voice modulation system that
will eventually replace SSB?
Thank you.? ?
? ? ? 73, Dan, N7DE?
Single side band typically requires a
10 DB signal to noise ratio for useful
communications in a disaster.? That
is, the efficient transfer of
information
My contrast, using the same base
noise in that bandwidth, data
communications of moderate speed can
tolerate SNR into low single digits,
and still move efficient
communications far faster than voice
Low data rate redundant digital
communications can tolerate signal
to noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who are
very involved in the (voice)
national traffic system often have
kilowatt amplifiers. ?
And people who are into JS8
?don¡¯t need them
So there are different
requirements for different parts of
our hobby
On Mar 26,
2023, at 11:33, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I
used 20 watts for a long
time, and I have had a
number of people refuse to
talk to me, because my
signal was too week, so more
power is needed.? I have
written a booklet about
solar cells, and maybe you
use solar cells and power
conversion, and that is also
a very interesting area, but
I also want to be able to
talk to people.
? ? ?
73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or useful
concept, especially in QRP
land.
I live on a sailboat and am
currently in Tampa Bay. With a
couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55
PM, Dan Eggers N7DE wrote:
20
w is -7 dB, and that is
too far down.? it is
getting close to -10 dB
down.? You need to be at
50 w, and that is only
-3 dB down.? What I have
used for low cost has
been an MRF455 in an
EB63A board from
Communications Concepts,
and it works very well.
?
However,
the Chinese are selling
a 100-w amplifier with a
heatsink that has had
the level set, and they
also sell a lowpass
filter board XDT LPF200
for 3 - 30 MHz at a
reasonable price that
works very well, so
these days there really
isn't any reason to
"build your own"
amplifier.?
?
The
main thing I am saying
is that you need more
power so that you can be
heard.? I went through
enough Electrical
Engineering courses that
I am now an Electrical
Engineer, but I do not
think I am going to try
design amplifiers from
scratch myself.
?
I
am very grateful for all
of the people who helped
produce the UBITX 6,
because I think that has
been the only low cost
real general coverage
transceiver that is out
there.? ? ? ? ? ? ?73,
Dan, N7DE
?
Hi Ted
Thanks. Incidentally the
FET is? IRFP150? And Not
IRF150 , sorry for the
typo.
I will edit at the end of
the video..
The FET i have used is
Harris IRFP 150
It works great with not
much heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: UBITX v4 - transmission power problem with FT8 emission.
I have two uBITX v6's and one uBITX v4. My digital crosspatch works great when plugged into the microphone input on either one of the v6's but I get less than ONE watt out of the v4 using the same crosspatch and connection cable. The v4 works fine on SSB with the same microphone that I use on the v6's. I can't see any differences between the schematics for the mic circuits between the two versions. Something is different but I have given up trying to figure it out. The v4 is sitting on the shelf collecting dust now. I am also interested in any suggestions for a solution to the problem.
--
Stephen, KO4CVU
|
Re: Easy 20 Watts with any qrp
#bitx40
nope .. its the second
first is/was mchf (and now its cloned from china)
i brought david and our programming group together ... rest is
history :-)
the guy with the laptop on very right is me ;-)
i have often used freedv with pc on shortwave and i have found
out that the freedv hardware solution .. smartmic .. sm1000 .. has
an stm32 chip and the mchf also has that stm32 inside ... then i
brought david rove in contact of our user group
dg9bfc sigi
Am 27.03.2023 um 01:35 schrieb Ashhar
Farhan:
toggle quoted message
Show quoted text
The digital voice mode that could possibly replace
ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of
very few bits per second. A usual voice stream like that of
telephone uses about 64,000 bits per second. Freedv codec
reduces it to 700 bits per second. This is at the cost of
reduced quality. However, it is much better that SSB on 80
meters.
The second thing is an HF modem that can work at
700 bits per second. This is a weird one. On HF as signals
bounce off the ionosphere and arrive at the rx antenna, you
can have a situation where the same signal can arrive taking
different paths and hence at different times , overlapping
itself. This reduces the number of times you can rapidly
change the frequency of the signal. This is why FT8 works so
well, it is so slow that fading, et al doesnt affect it. So,
what the freedv modem does is that it transmits a number of
parallel ft8 like signals as separate tones within the same
audio which when added up give you higher bandwidth. There is
a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making
it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated by
Morse code. When asked why, they replied that "voice"
(SSB) didn't interest them because they could do that
with their cell phone. But Morse was "better" because
their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed
some thing very fascinating among middle schoolers
in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they
will grab onto and play with until you have to
pull them away kicking and screaming with their
parents,
Is a Morse code key!!!
At every school open house that we hold we
now always provide multiple Morse code keys and
it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words per
minute. I sent 30 minutes worth of code to them
two weeks ago?
It is astonishing the attraction that Morse
code has for these middle schoolers
Meanwhile, across town, at the school devoted
to future police and fire high schoolers, they
have an extremely active contesting high school
I am radio club and I am told that their best
operator can do over 30 words per minute and
they routinely make hundreds and hundreds of
contacts at voice and CW in contests. ?
Our local ham radio club would have a hard
time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain number
of us who really love the auditory and tactile
tickling that only Morse code gives¡. And by the
way it is the first digital, the only digital
that can be decoded by the human brain without
much else.? End it enjoys an order of magnitude
or two advantage over voice In terms of
threshold signal to noise ratio!!!?
On Mar 26, 2023, at
13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW old
timers.? So far we have lost about half of the
CW people without any real replacements coming
along, but you and I came along during a
certain era.
Best wishes.? ? ? ?73,
Dan
Eventually there will be something that
replaces analog single side band voice. But it¡¯s
not yet here. ? And I think I have been doing CW
for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at
11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57 years,
and I will just continue to send Morse
code, but since you seem to be very
knowledgeable is there a digital voice
modulation system that will eventually
replace SSB?
Thank you.? ? ?
? ? 73, Dan, N7DE?
Single side band typically requires a 10
DB signal to noise ratio for useful
communications in a disaster.? That is,
the efficient transfer of information
My contrast, using the same base
noise in that bandwidth, data
communications of moderate speed can
tolerate SNR into low single digits,
and still move efficient
communications far faster than voice
Low data rate redundant digital
communications can tolerate signal to
noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who are
very involved in the (voice) national
traffic system often have kilowatt
amplifiers. ?
And people who are into JS8 ?don¡¯t
need them
So there are different requirements
for different parts of our hobby
On Mar 26,
2023, at 11:33, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I used
20 watts for a long time, and
I have had a number of people
refuse to talk to me, because
my signal was too week, so
more power is needed.? I have
written a booklet about solar
cells, and maybe you use solar
cells and power conversion,
and that is also a very
interesting area, but I also
want to be able to talk to
people.
? ? ?
73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or useful
concept, especially in QRP land.
I live on a sailboat and am
currently in Tampa Bay. With a
couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55
PM, Dan Eggers N7DE wrote:
20
w is -7 dB, and that is
too far down.? it is
getting close to -10 dB
down.? You need to be at
50 w, and that is only -3
dB down.? What I have used
for low cost has been an
MRF455 in an EB63A board
from Communications
Concepts, and it works
very well.
?
However,
the Chinese are selling a
100-w amplifier with a
heatsink that has had the
level set, and they also
sell a lowpass filter
board XDT LPF200 for 3 -
30 MHz at a reasonable
price that works very
well, so these days there
really isn't any reason to
"build your own"
amplifier.?
?
The
main thing I am saying is
that you need more power
so that you can be heard.?
I went through enough
Electrical Engineering
courses that I am now an
Electrical Engineer, but I
do not think I am going to
try design amplifiers from
scratch myself.
?
I
am very grateful for all
of the people who helped
produce the UBITX 6,
because I think that has
been the only low cost
real general coverage
transceiver that is out
there.? ? ? ? ? ? ?73,
Dan, N7DE
?
Hi Ted
Thanks. Incidentally the FET
is? IRFP150? And Not IRF150
, sorry for the typo.
I will edit at the end of
the video..
The FET i have used is
Harris IRFP 150
It works great with not much
heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
ah ... a clone of our mchf (M0NKA was built in our local club
from a dozen users)
it was me who brought david and our programming group together
i have seen that the mchf and the stm1000 share the stm32 chip
and thought a qrp rig is the right thing to have freedv inside ..
rest is history
(ask in the mchf user group about details, how we squeezed the
mchf firmare that small that the chip can run freedv in parallel)
dg9bfc sigi
Am 27.03.2023 um 03:25 schrieb Ashhar
Farhan:
toggle quoted message
Show quoted text
Gaah, they beat us to it. The good news is, in
open source, we just get to use it all the same! I am off to
read the code...
- f
On Mon, Mar 27, 2023, 6:52 AM
Gerald Sherman < ve4gks@...>
wrote:
I am expecting delivery in a few days of an RS918
(originally designed by M0NKA).? It supports Freedv, just
for your information.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-26 23:35, Ashhar Farhan wrote:
The digital voice mode that could possibly
replace ssb is freedv. It is actually two things that
work together.
First, the voice is converted into a
stream of very few bits per second. A usual voice
stream like that of telephone uses about 64,000 bits
per second. Freedv codec reduces it to 700 bits per
second. This is at the cost of reduced quality.
However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can
work at 700 bits per second. This is a weird one. On
HF as signals bounce off the ionosphere and arrive at
the rx antenna, you can have a situation where the
same signal can arrive taking different paths and
hence at different times , overlapping itself. This
reduces the number of times you can rapidly change the
frequency of the signal. This is why FT8 works so
well, it is so slow that fading, et al doesnt affect
it. So, what the freedv modem does is that it
transmits a number of parallel ft8 like signals as
separate tones within the same audio which when added
up give you higher bandwidth. There is a very
impressive name for it that escapes me now.
Our plan is to add freedv into the
sbitx, making it the the first radio to support it
natively.
- f
Gordon:
Either RadComm or Sprat
had an article how students in England were
fascinated by Morse code. When asked why, they
replied that "voice" (SSB) didn't interest them
because they could do that with their cell
phone. But Morse was "better" because their
parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have
observed some thing very fascinating among
middle schoolers in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF
radios
Don¡¯t even get me thinking about
digital.
What they absolutely go crazy over,
what they will grab onto and play with
until you have to pull them away kicking
and screaming with their parents,
Is a Morse code key!!!
At every school open house that we
hold we now always provide multiple
Morse code keys and it is a big draw.
We will provide them at this year¡®s
field day
The news media always want a picture
of someone sending Morse code
We have two 6th graders in a very
small school that are already doing
about 10 words per minute. I sent 30
minutes worth of code to them two weeks
ago?
It is astonishing the attraction that
Morse code has for these middle
schoolers
Meanwhile, across town, at the school
devoted to future police and fire high
schoolers, they have an extremely active
contesting high school I am radio club
and I am told that their best operator
can do over 30 words per minute and they
routinely make hundreds and hundreds of
contacts at voice and CW in contests. ?
Our local ham radio club would have a
hard time beating them!!!!
So I wouldn¡¯t quite give up yet.
?human nature is the same. And there are
certain number of us who really love the
auditory and tactile tickling that only
Morse code gives¡. And by the way it is
the first digital, the only digital that
can be decoded by the human brain
without much else.? End it enjoys an
order of magnitude or two advantage over
voice In terms of threshold signal to
noise ratio!!!?
On Mar 26,
2023, at 13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both
CW old timers.? So far we have lost
about half of the CW people without
any real replacements coming along,
but you and I came along during a
certain era.
Best wishes.? ?
? ?73, Dan
Eventually there will be something
that replaces analog single side band
voice. But it¡¯s not yet here. ? And I
think I have been doing CW for 55 years
or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26,
2023, at 11:51, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I have
been sending Morse code now
for 57 years, and I will just
continue to send Morse code,
but since you seem to be very
knowledgeable is there a
digital voice modulation
system that will eventually
replace SSB?
Thank
you.? ? ? ? ? 73, Dan, N7DE?
Single side band typically
requires a 10 DB signal to noise
ratio for useful communications
in a disaster.? That is, the
efficient transfer of
information
My contrast, using the same
base noise in that bandwidth,
data communications of
moderate speed can tolerate
SNR into low single digits,
and still move efficient
communications far faster than
voice
Low data rate redundant
digital communications can
tolerate signal to noise
ratios a couple orders of
magnitude lower SNR
These comparisons are
widely available
It¡¯s no secret why people
who are very involved in the
(voice) national traffic
system often have kilowatt
amplifiers. ?
And people who are into JS8
?don¡¯t need them
So there are different
requirements for different
parts of our hobby
On
Mar 26, 2023, at 11:33,
Dan Eggers N7DE <N7DE@...>
wrote:
?
I
used 20 watts for a
long time, and I have
had a number of people
refuse to talk to me,
because my signal was
too week, so more
power is needed.? I
have written a booklet
about solar cells, and
maybe you use solar
cells and power
conversion, and that
is also a very
interesting area, but
I also want to be able
to talk to people.
?
? ? 73, Dan, N7DE? ?
With respect, Dan,
"need" isn't an
actionable or useful
concept, especially in
QRP land.
I live on a sailboat and
am currently in Tampa
Bay. With a couple of
meters of tinn
On Sat, Mar 25, 2023 at
01:55 PM, Dan Eggers
N7DE wrote:
20 w is -7 dB, and that is too far down.? it is
getting close to
-10 dB down.? You
need to be at 50
w, and that is
only -3 dB down.?
What I have used
for low cost has
been an MRF455 in
an EB63A board
from
Communications
Concepts, and it
works very well.
?
However, the Chinese are selling a 100-w
amplifier with a
heatsink that has
had the level set,
and they also sell
a lowpass filter
board XDT LPF200
for 3 - 30 MHz at
a reasonable price
that works very
well, so these
days there really
isn't any reason
to "build your
own" amplifier.?
?
The main thing I am saying is that you need more
power so that you
can be heard.? I
went through
enough Electrical
Engineering
courses that I am
now an Electrical
Engineer, but I do
not think I am
going to try
design amplifiers
from scratch
myself.
?
I am very grateful for all of the people who
helped produce the
UBITX 6, because I
think that has
been the only low
cost real general
coverage
transceiver that
is out there.? ? ?
? ? ? ?73, Dan,
N7DE
?
Hi Ted
Thanks. Incidentally
the FET is? IRFP150?
And Not IRF150 ,
sorry for the typo.
I will edit at the
end of the video..
The FET i have used
is Harris IRFP 150
It works great with
not much heat at 35
V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: UBITX v4 - transmission power problem with FT8 emission.
I checked, the power is set in WSJTX and JTDX to maximum.
|
Hi
I am thrilled with how well the ubitx v6.1 works but I have a question regarding tuning steps.
I can use fast tuning steps and i can use slow tuning steps but
if i type in 3846 for 80 meters and then use the tuning knob in slow tune it increments it changes by .1 so from 3846.00
it goes to 3846.10 then 3846.20 then 3846.30 etc is there a way to get to 3846.33 ? ie change the last digit of the frequency display ?
If I use RIT it does the same thing.
Thanks
David W9PH
|
Re: UBITX v4 - transmission power problem with FT8 emission.
Check power control option built with wsjtx or Jtdx. It should be maximum to obtain max power.
When transmitting SSB, the radio works with power up to 10W without any problems.
However, when working with the FT8 emission, the power drops to 1W and I am unable to increase it in any way.
The signal strength from the computer is set to maximum.
After connecting another radio to the computer everything works fine.
73!!! Kris
|
UBITX v4 - transmission power problem with FT8 emission.
When transmitting SSB, the radio works with power up to 10W without any problems.
However, when working with the FT8 emission, the power drops to 1W and I am unable to increase it in any way.
The signal strength from the computer is set to maximum.
After connecting another radio to the computer everything works fine.
73!!! Kris
|
Re: Easy 20 Watts with any qrp
#bitx40
The transistor is IRFP 150 that is being used in my easy Bitx after the driver of 2 no's 2n3904 .
By mistake I mentioned the FET as IRF150 it's IRFP150.
The make is Harris .
Picture?attached?
Regards?
Sunil vu3sua
|
Re: Easy 20 Watts with any qrp
#bitx40
toggle quoted message
Show quoted text
On Mon, Mar 27, 2023, 6:07 AM Dan Eggers N7DE < N7DE@...> wrote:
I think that is wonderful, and when you remember the name please send it to me.? I am at the point where I sort of forget things temporairly also, so that is no big deal.? Oh, well.? I am interested in a
lot of different technologies that all take up my time, but of course I intend to continue to stick with CW.? ? ? 73, Dan
??
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However,
it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths
and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that
it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better"
because their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.
They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,
Is a Morse code key!!!
At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of someone sending Morse code
We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?
It is astonishing the attraction that Morse code has for these middle schoolers
Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make
hundreds and hundreds of contacts at voice and CW in contests. ?
Our local ham radio club would have a hard time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives¡. And by the way it is the first digital, the only digital that can be decoded by
the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?
On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:
?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.
Best wishes.? ? ? ?73, Dan
Eventually there will be something that replaces analog single side band voice. But it¡¯s not yet here. ? And I think I have been doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:
?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?
Thank you.? ? ? ? ? 73, Dan, N7DE?
Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information
My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice
Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR
These comparisons are widely available
It¡¯s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?
And people who are into JS8 ?don¡¯t need them
So there are different requirements for different parts of our hobby
On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:
?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power
conversion, and that is also a very interesting area, but I also want to be able to talk to people.
? ? ? 73, Dan, N7DE? ?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.
I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts,
and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really
isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers
from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: Easy 20 Watts with any qrp
#bitx40
My intention to use IRFP150 with 200mw drive was for pure experimentation. Secondly i wanted a solution for changing the mosfet if someone using our kit burns the mosfet either while setting the bias voltage or due to high swr.
?The IRFP150 which I already had for some other project seemed a logical choice for me as it was very convenient to mount on the rear cover and just connect the legs to the pins where the IRF510 inserts, in this way it would be easier to change the FET if somehow it got burnt. The PCB pad is quite delicate and if someone was to remove the FET mounted on the pcb it could damage the pads.
Overall the experiment worked and the RF output was 20 watts with just two numbers of 2n3904 as drivers. keep in mind this FET wan't give much power above 7 MHZ. This is good for lower bands only.
Now it's not my suggestion to use IRFP150 , it depends on your taste as to what you want either the power or the type of FET to use. I just shared my experiment result with you all.
Best of 73's
DE VU3SUA
Sunil Lakhani
/
FUSION RADIO STORE
OUR NEW YAHOO GROUP
Tracking Link For Shipments:
For EMS AND REGISTERED
|
Gaah, they beat us to it. The good news is, in open source, we just get to use it all the same! I am off to read the code... - f
On Mon, Mar 27, 2023, 6:52 AM Gerald Sherman < ve4gks@...> wrote:
I am expecting delivery in a few days of an RS918 (originally
designed by M0NKA).? It supports Freedv, just for your
information.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-26 23:35, Ashhar Farhan
wrote:
The digital voice mode that could possibly replace
ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of
very few bits per second. A usual voice stream like that of
telephone uses about 64,000 bits per second. Freedv codec
reduces it to 700 bits per second. This is at the cost of
reduced quality. However, it is much better that SSB on 80
meters.
The second thing is an HF modem that can work at
700 bits per second. This is a weird one. On HF as signals
bounce off the ionosphere and arrive at the rx antenna, you
can have a situation where the same signal can arrive taking
different paths and hence at different times , overlapping
itself. This reduces the number of times you can rapidly
change the frequency of the signal. This is why FT8 works so
well, it is so slow that fading, et al doesnt affect it. So,
what the freedv modem does is that it transmits a number of
parallel ft8 like signals as separate tones within the same
audio which when added up give you higher bandwidth. There is
a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making
it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated by
Morse code. When asked why, they replied that "voice"
(SSB) didn't interest them because they could do that
with their cell phone. But Morse was "better" because
their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed
some thing very fascinating among middle schoolers
in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they
will grab onto and play with until you have to
pull them away kicking and screaming with their
parents,
Is a Morse code key!!!
At every school open house that we hold we
now always provide multiple Morse code keys and
it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words per
minute. I sent 30 minutes worth of code to them
two weeks ago?
It is astonishing the attraction that Morse
code has for these middle schoolers
Meanwhile, across town, at the school devoted
to future police and fire high schoolers, they
have an extremely active contesting high school
I am radio club and I am told that their best
operator can do over 30 words per minute and
they routinely make hundreds and hundreds of
contacts at voice and CW in contests. ?
Our local ham radio club would have a hard
time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain number
of us who really love the auditory and tactile
tickling that only Morse code gives¡. And by the
way it is the first digital, the only digital
that can be decoded by the human brain without
much else.? End it enjoys an order of magnitude
or two advantage over voice In terms of
threshold signal to noise ratio!!!?
On Mar 26, 2023, at
13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW old
timers.? So far we have lost about half of the
CW people without any real replacements coming
along, but you and I came along during a
certain era.
Best wishes.? ? ? ?73,
Dan
Eventually there will be something that
replaces analog single side band voice. But it¡¯s
not yet here. ? And I think I have been doing CW
for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at
11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57 years,
and I will just continue to send Morse
code, but since you seem to be very
knowledgeable is there a digital voice
modulation system that will eventually
replace SSB?
Thank you.? ? ?
? ? 73, Dan, N7DE?
Single side band typically requires a 10
DB signal to noise ratio for useful
communications in a disaster.? That is,
the efficient transfer of information
My contrast, using the same base
noise in that bandwidth, data
communications of moderate speed can
tolerate SNR into low single digits,
and still move efficient
communications far faster than voice
Low data rate redundant digital
communications can tolerate signal to
noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who are
very involved in the (voice) national
traffic system often have kilowatt
amplifiers. ?
And people who are into JS8 ?don¡¯t
need them
So there are different requirements
for different parts of our hobby
On Mar 26,
2023, at 11:33, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I used
20 watts for a long time, and
I have had a number of people
refuse to talk to me, because
my signal was too week, so
more power is needed.? I have
written a booklet about solar
cells, and maybe you use solar
cells and power conversion,
and that is also a very
interesting area, but I also
want to be able to talk to
people.
? ? ?
73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or useful
concept, especially in QRP land.
I live on a sailboat and am
currently in Tampa Bay. With a
couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55
PM, Dan Eggers N7DE wrote:
20
w is -7 dB, and that is
too far down.? it is
getting close to -10 dB
down.? You need to be at
50 w, and that is only -3
dB down.? What I have used
for low cost has been an
MRF455 in an EB63A board
from Communications
Concepts, and it works
very well.
?
However,
the Chinese are selling a
100-w amplifier with a
heatsink that has had the
level set, and they also
sell a lowpass filter
board XDT LPF200 for 3 -
30 MHz at a reasonable
price that works very
well, so these days there
really isn't any reason to
"build your own"
amplifier.?
?
The
main thing I am saying is
that you need more power
so that you can be heard.?
I went through enough
Electrical Engineering
courses that I am now an
Electrical Engineer, but I
do not think I am going to
try design amplifiers from
scratch myself.
?
I
am very grateful for all
of the people who helped
produce the UBITX 6,
because I think that has
been the only low cost
real general coverage
transceiver that is out
there.? ? ? ? ? ? ?73,
Dan, N7DE
?
Hi Ted
Thanks. Incidentally the FET
is? IRFP150? And Not IRF150
, sorry for the typo.
I will edit at the end of
the video..
The FET i have used is
Harris IRFP 150
It works great with not much
heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
I am expecting delivery in a few days of an RS918 (originally
designed by M0NKA).? It supports Freedv, just for your
information.
Gerry Sherman
Sent by the Linux Thunderbird
On 2023-03-26 23:35, Ashhar Farhan
wrote:
toggle quoted message
Show quoted text
The digital voice mode that could possibly replace
ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of
very few bits per second. A usual voice stream like that of
telephone uses about 64,000 bits per second. Freedv codec
reduces it to 700 bits per second. This is at the cost of
reduced quality. However, it is much better that SSB on 80
meters.
The second thing is an HF modem that can work at
700 bits per second. This is a weird one. On HF as signals
bounce off the ionosphere and arrive at the rx antenna, you
can have a situation where the same signal can arrive taking
different paths and hence at different times , overlapping
itself. This reduces the number of times you can rapidly
change the frequency of the signal. This is why FT8 works so
well, it is so slow that fading, et al doesnt affect it. So,
what the freedv modem does is that it transmits a number of
parallel ft8 like signals as separate tones within the same
audio which when added up give you higher bandwidth. There is
a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making
it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had
an article how students in England were fascinated by
Morse code. When asked why, they replied that "voice"
(SSB) didn't interest them because they could do that
with their cell phone. But Morse was "better" because
their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed
some thing very fascinating among middle schoolers
in our local school.
They are not interested at all in
walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they
will grab onto and play with until you have to
pull them away kicking and screaming with their
parents,
Is a Morse code key!!!
At every school open house that we hold we
now always provide multiple Morse code keys and
it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of
someone sending Morse code
We have two 6th graders in a very small
school that are already doing about 10 words per
minute. I sent 30 minutes worth of code to them
two weeks ago?
It is astonishing the attraction that Morse
code has for these middle schoolers
Meanwhile, across town, at the school devoted
to future police and fire high schoolers, they
have an extremely active contesting high school
I am radio club and I am told that their best
operator can do over 30 words per minute and
they routinely make hundreds and hundreds of
contacts at voice and CW in contests. ?
Our local ham radio club would have a hard
time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human
nature is the same. And there are certain number
of us who really love the auditory and tactile
tickling that only Morse code gives¡. And by the
way it is the first digital, the only digital
that can be decoded by the human brain without
much else.? End it enjoys an order of magnitude
or two advantage over voice In terms of
threshold signal to noise ratio!!!?
On Mar 26, 2023, at
13:23, Dan Eggers N7DE <N7DE@...>
wrote:
?
Thank
you?for the
information.? I see you and I are both CW old
timers.? So far we have lost about half of the
CW people without any real replacements coming
along, but you and I came along during a
certain era.
Best wishes.? ? ? ?73,
Dan
Eventually there will be something that
replaces analog single side band voice. But it¡¯s
not yet here. ? And I think I have been doing CW
for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at
11:51, Dan Eggers N7DE <N7DE@...>
wrote:
?
I have been
sending Morse code now for 57 years,
and I will just continue to send Morse
code, but since you seem to be very
knowledgeable is there a digital voice
modulation system that will eventually
replace SSB?
Thank you.? ? ?
? ? 73, Dan, N7DE?
Single side band typically requires a 10
DB signal to noise ratio for useful
communications in a disaster.? That is,
the efficient transfer of information
My contrast, using the same base
noise in that bandwidth, data
communications of moderate speed can
tolerate SNR into low single digits,
and still move efficient
communications far faster than voice
Low data rate redundant digital
communications can tolerate signal to
noise ratios a couple orders of
magnitude lower SNR
These comparisons are widely
available
It¡¯s no secret why people who are
very involved in the (voice) national
traffic system often have kilowatt
amplifiers. ?
And people who are into JS8 ?don¡¯t
need them
So there are different requirements
for different parts of our hobby
On Mar 26,
2023, at 11:33, Dan Eggers N7DE
<N7DE@...>
wrote:
?
I used
20 watts for a long time, and
I have had a number of people
refuse to talk to me, because
my signal was too week, so
more power is needed.? I have
written a booklet about solar
cells, and maybe you use solar
cells and power conversion,
and that is also a very
interesting area, but I also
want to be able to talk to
people.
? ? ?
73, Dan, N7DE? ?
With respect, Dan, "need"
isn't an actionable or useful
concept, especially in QRP land.
I live on a sailboat and am
currently in Tampa Bay. With a
couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55
PM, Dan Eggers N7DE wrote:
20
w is -7 dB, and that is
too far down.? it is
getting close to -10 dB
down.? You need to be at
50 w, and that is only -3
dB down.? What I have used
for low cost has been an
MRF455 in an EB63A board
from Communications
Concepts, and it works
very well.
?
However,
the Chinese are selling a
100-w amplifier with a
heatsink that has had the
level set, and they also
sell a lowpass filter
board XDT LPF200 for 3 -
30 MHz at a reasonable
price that works very
well, so these days there
really isn't any reason to
"build your own"
amplifier.?
?
The
main thing I am saying is
that you need more power
so that you can be heard.?
I went through enough
Electrical Engineering
courses that I am now an
Electrical Engineer, but I
do not think I am going to
try design amplifiers from
scratch myself.
?
I
am very grateful for all
of the people who helped
produce the UBITX 6,
because I think that has
been the only low cost
real general coverage
transceiver that is out
there.? ? ? ? ? ? ?73,
Dan, N7DE
?
Hi Ted
Thanks. Incidentally the FET
is? IRFP150? And Not IRF150
, sorry for the typo.
I will edit at the end of
the video..
The FET i have used is
Harris IRFP 150
It works great with not much
heat at 35 V .
Regards
Sunil vu3sua
--
Jack, W8TEE
|
Re: Easy 20 Watts with any qrp
#bitx40
I think that is wonderful, and when you remember the name please send it to me.? I am at the point where I sort of forget things temporairly also, so that is no big deal.? Oh, well.? I am interested in a
lot of different technologies that all take up my time, but of course I intend to continue to stick with CW.? ? ? 73, Dan
??
toggle quoted message
Show quoted text
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However,
it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths
and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that
it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f
Gordon:
Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better"
because their parents couldn't understand what was being said.
Any port in a storm...
Jack, W8TEE
Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.
They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don¡¯t even get me thinking about digital.
What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,
Is a Morse code key!!!
At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.
We will provide them at this year¡®s field day
The news media always want a picture of someone sending Morse code
We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?
It is astonishing the attraction that Morse code has for these middle schoolers
Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make
hundreds and hundreds of contacts at voice and CW in contests. ?
Our local ham radio club would have a hard time beating them!!!!
So I wouldn¡¯t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives¡. And by the way it is the first digital, the only digital that can be decoded by
the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?
On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:
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Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.
Best wishes.? ? ? ?73, Dan
Eventually there will be something that replaces analog single side band voice. But it¡¯s not yet here. ? And I think I have been doing CW for 55 years or more. ?
That¡¯s my thought
Gordon Kx4z?
On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:
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I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?
Thank you.? ? ? ? ? 73, Dan, N7DE?
Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information
My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice
Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR
These comparisons are widely available
It¡¯s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?
And people who are into JS8 ?don¡¯t need them
So there are different requirements for different parts of our hobby
On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:
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I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power
conversion, and that is also a very interesting area, but I also want to be able to talk to people.
? ? ? 73, Dan, N7DE? ?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.
I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn
On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts,
and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really
isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers
from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
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Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua
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Jack, W8TEE
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Sunil Lakhani
