?well quite happy to be a beta tester, and I can *always* use a tuner, so just let me know what it costs and I'll send it to you when you are ready......
cheers!!
gordon
toggle quoted message
Show quoted text
Well my company will manufacture the tuner, but i will need a bunch of beta testers to work any bugs out. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it:
email:??bill@...
?
On Dec 31, 2017, at 8:10 AM, Gordon Gibby < ggibby@...> wrote:
?If you guys make this happen, I'm going to be rather amazed.? ?Even if it merely does a clunky search search search algorithm in the beginning......
It can later do the intellituner thing with the smith chart type calculations.? ?
I'm able to actuate my MFJ 993B intellituner easily on 80 meters and usually on 40 and sometimes higher with my uBitx running just 12 volts to the finals and doing digital.? ?But that thing was about $270...........
As Ashhar pointed out....someone should form a company.? ?Crowd-fund it if you wish.? ? Get printed circuit boards.? (I even learned how to do that!)? ?think about how to make sure it works for every possible mode & application.....
For scanning systems like WINLINK, it would be wonderful if it could move to memory positions on RECEIVE (which means the VFO has to output something, or you have to use a frequency counter to watch it)
For ALE, the freuqncy changes are TOO FAST to follow with relays.
Cheers.
gordon
I agree with Rod...it should have its own Nano. The issue really isn't the processing power, but the ?BITX I/O lines are pretty scarce. Plus, you can buy the Nano for $3, so why not? Finally, it would make the
software development a little easier since could be run "alone" during testing.
Jack, W8TEE
William,
Count me in.
I would be inclined to implement it it a separate case to be used with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem if not, I can simply supply a Nano and make the tuner believe it is 'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go
inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ???
?
?
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it:
Like us on Facebook!
?
?
?
?
Good pickups!
?
So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways:
?
1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders
at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.?
?
2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they
work with lots of different kinds of wire.?
?
3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ?
?
4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100
?
5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey.
?
6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from
from 40 meters all the way through 6 meters
?
?
And there are probably many more....
?
Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
|
I am not a professional guinea pig, but I play one on tv.... I'd love to be a beta tester!
On Sun, Dec 31, 2017 at 12:17 PM, Karl Heinz Kremer, K5KHK <khk@...> wrote: I am a professional guinea pig, so of course I am volunteering to be a beta tester :)
--
Karl Heinz - K5KHK
-- W2KAP In any given circuit, the most expensive part will always sacrifice itself to protect the fuse.
|
I am a professional guinea pig, so of course I am volunteering to be a beta tester :)
--
Karl Heinz - K5KHK
|
I would like to be a beta tester too. I have a
BitX40 and uBitX as well as several other qrp units. Steve
kb1chu
On 12/31/2017 12:01 PM, bill richardson
wrote:
toggle quoted message
Show quoted text
I wouldn't mind being a beta tester.. don¡¯t have my uBitx yet but
I did order one on 15 Dec so would think it will arrive soon. I do
have 2 working bitx40¡¯s that are modified to work on ?40-160
Meters so would also test using them. Have other Qrp rigs that I
could test also.
Sent from my iPhone
On Dec 31, 2017, at 11:26 AM, K9HZ < bill@...>
wrote:
Well my company will manufacture the tuner, but i will need a
bunch of beta testers to work any bugs out. ?
Dr.?William
J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
?
Owner
- Operator
Big
Signal Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner
¨C Operator
Villa
Grand Piton - J68HZ
Soufriere,
St. Lucia W.I.
Rent
it:
email:??bill@...
?
On Dec 31, 2017, at 8:10 AM, Gordon Gibby < ggibby@...>
wrote:
?If you guys make this happen, I'm going to be rather
amazed.? ?Even if it merely does a clunky search search
search algorithm in the beginning......
It can later do the intellituner thing with the smith
chart type calculations.? ?
I'm able to actuate my MFJ 993B intellituner easily on
80 meters and usually on 40 and sometimes higher with my
uBitx running just 12 volts to the finals and doing
digital.? ?But that thing was about $270...........
As Ashhar pointed out....someone should form a
company.? ?Crowd-fund it if you wish.? ? Get printed
circuit boards.? (I even learned how to do that!)?
?think about how to make sure it works for every
possible mode & application.....
For scanning systems like WINLINK, it would be
wonderful if it could move to memory positions on
RECEIVE (which means the VFO has to output something, or
you have to use a frequency counter to watch it)
For ALE, the freuqncy changes are TOO FAST to follow
with relays.
Cheers.
gordon
I
agree with Rod...it should have its own Nano. The
issue really isn't the processing power, but the
?BITX I/O lines are pretty scarce. Plus, you can
buy the Nano for $3, so why not? Finally, it would
make the software development a little easier
since could be run "alone" during testing.
Jack,
W8TEE
William,
Count me in.
I would be inclined to implement it it a
separate case to be used with other
rigs,also.
What are your (er) current thoughts on
separate Nano vs integrate into ubitx's
Nano?
Hope it has its own Nano, and does not
rely on the ubitx. No problem if not, I
can simply supply a Nano and make the
tuner believe it is 'talking' to the
ubitx.
Maybe I will come up with a
stand-alone-controller-project for your
tuner, so it can be driven with two
wires, start and done.
I am interested in supporting this
project.
Regards,
Rod KM6SN
On
12/29/2017 07:05 AM, K9HZ wrote:
So after
finishing up most of my projects a
few days ago¡ I really needed
something to do¡ so I put on the
drawing board¡ a 100w automatic
tuner that can work with the uBITx
(intended to go inside the same
case actually) that provides
power, SWR, band memory for same
antennas, low power tune, bypass,
etc. all in a kit form for about
$30.? I¡¯m prototyping the think
now and will work on the
tuning/communications code (to
integrate into the Raduino)
shortly.? I¡¯ve contacted a few of
you off-channel to work out some
protocol/communication issues¡?
but Stay tuned (double play on
words there)! ???
?
?
Dr. William J. Schmidt -
K9HZ J68HZ 8P6HK ZF2HZ
PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton ¨C
J68HZ
Soufriere, St. Lucia
W.I.
Rent it:
Like
us on Facebook!
?
?
?
?
Good pickups!
?
So the ALE
(automatic link establishment)
crowd, much like the WINLINK
crowd, tend to use LOTS of
bands....and thus they find ways
to make their antenna systems work
on mulltiple bands.? ?Here are
some of the most popular ways:
?
1.? ?Fan Dipoles
(time honored technique of tying
multiple dipoles together at the
CENTER, and the energy tends to go
to the correct one, since all the
others present much higher
impedances.? ?The wires "fan" out
with usually wooden spreaders at
the? end and some string involved
to keep them somewhat separate.?
?Been there done that many times,
my college ham club has a 3-band
unit up on the top of an 11 story
building rightnow that I built for
them.? ?Build for yourself, dirt
cheap.?
?
2.? Auto-tuners?
--- everyone makes these now and
many can tune as soon as they see
RF, or even return to previous
settings that were memorized.?
?LDG,? and others.? ?Low power
versions for $100? ?End fed wire
to balanced line fed
dipoles---they work with lots of
different kinds of wire.?
?
3.? Inherently
multiband antennas:? ?example,
full wavelength loops.? ?Build for
yourself.? ?
?
4.? Carefully
tuned end-fed transformer-fed
antennas --- there are now several
of these on the market and they
give an acceptable SWR on
mulltiple harmonically related
bands.? ?Tend to be close to $100
?
5.? (the one I
dislike)? resistively terminated
folded dipoles --- these use a
resistor to make up for what a
folded dipole can't create and
give an SWR that is "acceptable"
literally across EVERY FREQUENCY
in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as
much as 10 db at times.? And they
generally are pricey.
?
6.? There are some
multi-band vertical antennas on
the market that are basically
vertical fan dipoles, but
scrunched up in a nice package.?
?An elderly ham in my city has
one, 32 feet tall....a gang of us
put it up and doggone it does from
from 40 meters all the way through
6 meters
?
?
And there are
probably many more....
?
Gordon
An automatic tuner
protects the rig during TX.?
If the SWR is bad during TX,
some of the signal coming out
of the transmitter is
reflected by the antenna back
into the radio where it can
cause damage.
That said, RX is optimized by
a properly tuned antenna, but
some good amount of signal
still makes into the radio
when receiving, even when the
antenna is not perfect.
So I assume Doc G? is scanning
for radio traffic, and then
when he finds some if he wants
to transmit he does something
about his SWR for that
frequency.
|
Re: uBitx IRF510 to IRF510 physical measurement
Thank you! Sent from my iPhone
toggle quoted message
Show quoted text
On Dec 31, 2017, at 11:56 AM, Jerry Gaffke via Groups.Io < jgaffke@...> wrote: IR510's are placed 1.33" apart, center to center. On Sun, Dec 31, 2017 at 08:50 am, bill richardson wrote:
Can someone (that has a uBitx) measure on center to on center from one irf510 to the other.
|
I wouldn't mind being a beta tester.. don¡¯t have my uBitx yet but I did order one on 15 Dec so would think it will arrive soon. I do have 2 working bitx40¡¯s that are modified to work on ?40-160 Meters so would also test using them. Have other Qrp rigs that I could test also. Sent from my iPhone
toggle quoted message
Show quoted text
On Dec 31, 2017, at 11:26 AM, K9HZ < bill@...> wrote: Well my company will manufacture the tuner, but i will need a bunch of beta testers to work any bugs out. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ? On Dec 31, 2017, at 8:10 AM, Gordon Gibby < ggibby@...> wrote:
?If you guys make this happen, I'm going to be rather amazed.? ?Even if it merely does a clunky search search search algorithm in the beginning......
It can later do the intellituner thing with the smith chart type calculations.? ?
I'm able to actuate my MFJ 993B intellituner easily on 80 meters and usually on 40 and sometimes higher with my uBitx running just 12 volts to the finals and doing digital.? ?But that thing was about $270...........
As Ashhar pointed out....someone should form a company.? ?Crowd-fund it if you wish.? ? Get printed circuit boards.? (I even learned how to do that!)? ?think about how to make sure it works for every possible mode & application.....
For scanning systems like WINLINK, it would be wonderful if it could move to memory positions on RECEIVE (which means the VFO has to output something, or you have to use a frequency counter to watch it)
For ALE, the freuqncy changes are TOO FAST to follow with relays.
Cheers.
gordon
I agree with Rod...it should have its own Nano. The issue really isn't the processing power, but the ?BITX I/O lines are pretty scarce. Plus, you can buy the Nano for $3, so why not? Finally, it would make the
software development a little easier since could be run "alone" during testing.
Jack, W8TEE
William,
Count me in.
I would be inclined to implement it it a separate case to be used with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem if not, I can simply supply a Nano and make the tuner believe it is 'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go
inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ???
?
?
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it:
Like us on Facebook!
?
?
?
?
Good pickups!
?
So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways:
?
1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders
at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.?
?
2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they
work with lots of different kinds of wire.?
?
3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ?
?
4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100
?
5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey.
?
6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from
from 40 meters all the way through 6 meters
?
?
And there are probably many more....
?
Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
|
Re: Crystal Filter Input and Output Impedance Measurements
There has been a lot of interest in crystal filter termination here.
I have done some studies of crystal-filter-shape vs termination impedances, and the attached pictures show the effects of filter termination impedance.
The 30xfil-1.jpg shows shape vs termination resistance on a surplus 10.9 MHz filter I had in the junkbox. The traces clearly show how the ripple improves with better terminations. (IIRC, the termination resistances were probably in the 50 to 750 ohm range). The trace third-down from the top looks pretty good.
After determining the correct resistance, a tuneable L match would probably flatten the passband even more.
Separately, I made two filters for my Minima. I got a batch of 100 crsytals, measured their frequency in an oscillator, put the results in a spread-sheet, sorted the data, and selected the two sets of best-matched. The 20both.jpg file shows the results...not bad filters!
This was all done on homebrew test equipment that cost me less than $100 to build. Details below for those who are curious.
Regards,
Rod KM6SN
The impetus for this project was that I wanted to improve my homebrew crystal filters, and had no method of accurately recording filter sweeps. I needed to record
them for the purpose of comparing filter "improvements", so I built the hardware and the software to do so.
There is a extremely powerful data plotting program called KST. It is open-source (as in free), available for Windows and Linux. It offers a wide array of data visualization tools.
I used a homebrew scalar network analyzer (SNA), which is an Arduino running an AD9850 DDS, and a W7ZOI power meter circuit. The analog output of the power meter is feed into an a/d input on an Arduino, which prepares the frequency-vs-amplitude data and sends it on a serial port to the PC for logging. It is very sweeperino-like.
A companion program on the PC put the data into KST friendly files. Then I manually ran KST to create the plots you see.
All of the hardware was built dead-bug style, and other than the caution used in the W7ZOI power meter (google it), nothing is critical.
|
Re: uBitx IRF510 to IRF510 physical measurement
IR510's are placed 1.33" apart, center to center.
toggle quoted message
Show quoted text
On Sun, Dec 31, 2017 at 08:50 am, bill richardson wrote:
Can someone (that has a uBitx) measure on center to on center from one irf510 to the other.
|
uBitx IRF510 to IRF510 physical measurement
looking to buy a large heatsink to use on my uBitx when it arrives. Can someone (that has a uBitx) measure on center to on center from one irf510 to the other.
looking at using this one:
Aluminum Heat Sink Heatsink Module Cooler Fin for High Power Amplifier Transistor Semiconductor Devices with Dense 24 pcs Fins 5.9"(L) x 2.3"(W) x 0.98"(H) 1pc/ 150 mm (L) x 59mm (W) x 25mm (H)
https://www.amazon.com/dp/B073VDVVP5/ref=cm_sw_r_cp_tai_xsrsAb5YJE73T
Thank you
Bill ng1p
|
So did I, my date's different from yours tho. I only ordered Thurs nite.
Vince.
toggle quoted message
Show quoted text
On 12/31/2017 09:11 AM, WA9GQT via Groups.Io wrote: I just received this post today(Dec 31).
Dear Customer,
Happy New Year!
We have received your payment of USD 119 on December 23, 2017 through
Paypal. Your payment has been included in the 'Pre order' list. The
orders are being shipped in the order of the payment received. It is
difficult for us to estimate the shipping date for your order. However,
we are putting our best efforts to ship them asap. The tracking details
of the shipment will be updated on the Paypal transaction once the order
is shipped.
We are overwhelmed with your response for micro BITX and we are
encouraged to do better and roll out new products.
Please cooperate with us for the delay in shipping your orders. We look
forward to your continued patronage. In case, you have any issues, get
in touch with us at hfsignals@... <mailto:hfsignals@...>
HFSignals Team
Thank you Ashhar
Happy New Year,
73, Rod WA9GQT
--
Michigan VHF Corp.
|
Re: A dual-band transceiver - trcv005.pdf
Interesting.
Just months prior to the bidi thing of???
Back when many of us still had dark hair.
Lots of relays and 2n3866's.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Sun, Dec 31, 2017 at 07:59 am, Michael Hagen wrote:
|
On 12/31/2017 11:26 AM, K9HZ wrote:
toggle quoted message
Show quoted text
Well my company will manufacture the tuner, but i will need a
bunch of beta testers to work any bugs out. ?
Dr.?William
J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
?
Owner -
Operator
Big Signal
Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner ¨C
Operator
Villa
Grand Piton - J68HZ
Soufriere,
St. Lucia W.I.
Rent it:
email:??bill@...
?
On Dec 31, 2017, at 8:10 AM, Gordon Gibby < ggibby@...>
wrote:
?If you guys make this happen, I'm going to be rather
amazed.? ?Even if it merely does a clunky search search
search algorithm in the beginning......
It can later do the intellituner thing with the smith chart
type calculations.? ?
I'm able to actuate my MFJ 993B intellituner easily on 80
meters and usually on 40 and sometimes higher with my uBitx
running just 12 volts to the finals and doing digital.? ?But
that thing was about $270...........
As Ashhar pointed out....someone should form a company.?
?Crowd-fund it if you wish.? ? Get printed circuit boards.?
(I even learned how to do that!)? ?think about how to make
sure it works for every possible mode & application.....
For scanning systems like WINLINK, it would be wonderful if
it could move to memory positions on RECEIVE (which means
the VFO has to output something, or you have to use a
frequency counter to watch it)
For ALE, the freuqncy changes are TOO FAST to follow with
relays.
Cheers.
gordon
I agree
with Rod...it should have its own Nano. The issue
really isn't the processing power, but the ?BITX I/O
lines are pretty scarce. Plus, you can buy the Nano
for $3, so why not? Finally, it would make the
software development a little easier since could be
run "alone" during testing.
Jack,
W8TEE
William,
Count me in.
I would be inclined to implement it it a
separate case to be used with other
rigs,also.
What are your (er) current thoughts on
separate Nano vs integrate into ubitx's
Nano?
Hope it has its own Nano, and does not rely
on the ubitx. No problem if not, I can
simply supply a Nano and make the tuner
believe it is 'talking' to the ubitx.
Maybe I will come up with a
stand-alone-controller-project for your
tuner, so it can be driven with two wires,
start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On
12/29/2017 07:05 AM, K9HZ wrote:
So after
finishing up most of my projects a few
days ago¡ I really needed something to
do¡ so I put on the drawing board¡ a
100w automatic tuner that can work
with the uBITx (intended to go inside
the same case actually) that provides
power, SWR, band memory for same
antennas, low power tune, bypass, etc.
all in a kit form for about $30.? I¡¯m
prototyping the think now and will
work on the tuning/communications code
(to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you
off-channel to work out some
protocol/communication issues¡? but
Stay tuned (double play on words
there)! ???
?
?
Dr. William J. Schmidt - K9HZ
J68HZ 8P6HK ZF2HZ PJ4/K9HZ
VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it:
Like us
on Facebook!
?
?
?
?
Good pickups!
?
So the ALE (automatic
link establishment) crowd, much like
the WINLINK crowd, tend to use LOTS of
bands....and thus they find ways to
make their antenna systems work on
mulltiple bands.? ?Here are some of
the most popular ways:
?
1.? ?Fan Dipoles (time
honored technique of tying multiple
dipoles together at the CENTER, and
the energy tends to go to the correct
one, since all the others present much
higher impedances.? ?The wires "fan"
out with usually wooden spreaders at
the? end and some string involved to
keep them somewhat separate.? ?Been
there done that many times, my college
ham club has a 3-band unit up on the
top of an 11 story building rightnow
that I built for them.? ?Build for
yourself, dirt cheap.?
?
2.? Auto-tuners? ---
everyone makes these now and many can
tune as soon as they see RF, or even
return to previous settings that were
memorized.? ?LDG,? and others.? ?Low
power versions for $100? ?End fed wire
to balanced line fed dipoles---they
work with lots of different kinds of
wire.?
?
3.? Inherently
multiband antennas:? ?example, full
wavelength loops.? ?Build for
yourself.? ?
?
4.? Carefully tuned
end-fed transformer-fed antennas ---
there are now several of these on the
market and they give an acceptable SWR
on mulltiple harmonically related
bands.? ?Tend to be close to $100
?
5.? (the one I
dislike)? resistively terminated
folded dipoles --- these use a
resistor to make up for what a folded
dipole can't create and give an SWR
that is "acceptable" literally across
EVERY FREQUENCY in a decade of
frequencies.? ?3-30 MHz.? ?The
tradeoff is loss, as much as 10 db at
times.? And they generally are pricey.
?
6.? There are some
multi-band vertical antennas on the
market that are basically vertical fan
dipoles, but scrunched up in a nice
package.? ?An elderly ham in my city
has one, 32 feet tall....a gang of us
put it up and doggone it does from
from 40 meters all the way through 6
meters
?
?
And there are probably
many more....
?
Gordon
An automatic tuner
protects the rig during TX.? If
the SWR is bad during TX, some of
the signal coming out of the
transmitter is reflected by the
antenna back into the radio where
it can cause damage.
That said, RX is optimized by a
properly tuned antenna, but some
good amount of signal still makes
into the radio when receiving,
even when the antenna is not
perfect.
So I assume Doc G? is scanning for
radio traffic, and then when he
finds some if he wants to transmit
he does something about his SWR
for that frequency.
|
Way above my head, but very interested in this project.? Would be interested in something that could be supplied as a built PCB, and just needed the controls, plugs and sockets etc. connecting up, and of course boxing. Would look great added as part of the Bitx - uBitx line up.
Phil - G7BZD
On Sun, Dec 31, 2017 at 4:23 PM, K9HZ <bill@...> wrote: That was the plan from the start.? Even with its own nano I need 18 latching digital lines so ill be doing some expanding/latching/mux-ing.?
What I'm struggling with at the moment is using latching relays (expensive) vs the added current from all of the relays if they are not latching.? Not good for battery ops.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ? On Dec 31, 2017, at 7:55 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: I agree with Rod...it should have its own Nano. The issue really isn't the processing power, but the ?BITX I/O lines are pretty scarce. Plus, you can buy the Nano for $3, so why not? Finally, it would make the software development a little easier since could be run "alone" during testing.
Jack, W8TEE
William,
Count me in.
I would be inclined to implement it it a separate case to be used
with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate
into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem
if not, I can simply supply a Nano and make the tuner believe it is
'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your
tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So
after finishing up most of my projects a few days ago¡ I
really needed something to do¡ so I put on the drawing
board¡ a 100w automatic tuner that can work with the uBITx
(intended to go inside the same case actually) that provides
power, SWR, band memory for same antennas, low power tune,
bypass, etc. all in a kit form for about $30.? I¡¯m
prototyping the think now and will work on the
tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work
out some protocol/communication issues¡? but Stay tuned
(double play on words there)! ???
?
?
Dr.
William
J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
?
Owner
- Operator
Big
Signal Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner
¨C Operator
Villa
Grand Piton ¨C J68HZ
Soufriere,
St. Lucia W.I.
Rent
it:
Like us on Facebook!
?
?
?
?
Good
pickups!
?
So
the ALE (automatic link establishment) crowd, much like the
WINLINK crowd, tend to use LOTS of bands....and thus they
find ways to make their antenna systems work on mulltiple
bands.? ?Here are some of the most popular ways:
?
1.?
?Fan Dipoles (time honored technique of tying multiple
dipoles together at the CENTER, and the energy tends to go
to the correct one, since all the others present much higher
impedances.? ?The wires "fan" out with usually wooden
spreaders at the? end and some string involved to keep them
somewhat separate.? ?Been there done that many times, my
college ham club has a 3-band unit up on the top of an 11
story building rightnow that I built for them.? ?Build for
yourself, dirt cheap.?
?
2.?
Auto-tuners? --- everyone makes these now and many can tune
as soon as they see RF, or even return to previous settings
that were memorized.? ?LDG,? and others.? ?Low power
versions for $100? ?End fed wire to balanced line fed
dipoles---they work with lots of different kinds of wire.?
?
3.?
Inherently multiband antennas:? ?example, full wavelength
loops.? ?Build for yourself.? ?
?
4.?
Carefully tuned end-fed transformer-fed antennas --- there
are now several of these on the market and they give an
acceptable SWR on mulltiple harmonically related bands.?
?Tend to be close to $100
?
5.?
(the one I dislike)? resistively terminated folded dipoles
--- these use a resistor to make up for what a folded dipole
can't create and give an SWR that is "acceptable" literally
across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And
they generally are pricey.
?
6.?
There are some multi-band vertical antennas on the market
that are basically vertical fan dipoles, but scrunched up in
a nice package.? ?An elderly ham in my city has one, 32 feet
tall....a gang of us put it up and doggone it does from from
40 meters all the way through 6 meters
?
?
And
there are probably many more....
?
Gordon
An
automatic tuner protects the rig during TX.? If the SWR
is bad during TX, some of the signal coming out of the
transmitter is reflected by the antenna back into the
radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna,
but some good amount of signal still makes into the
radio when receiving, even when the antenna is not
perfect.
So I assume Doc G? is scanning for radio traffic, and
then when he finds some if he wants to transmit he does
something about his SWR for that frequency.
<image001.gif>
|
Well my company will manufacture the tuner, but i will need a bunch of beta testers to work any bugs out. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
toggle quoted message
Show quoted text
On Dec 31, 2017, at 8:10 AM, Gordon Gibby < ggibby@...> wrote:
?If you guys make this happen, I'm going to be rather amazed.? ?Even if it merely does a clunky search search search algorithm in the beginning......
It can later do the intellituner thing with the smith chart type calculations.? ?
I'm able to actuate my MFJ 993B intellituner easily on 80 meters and usually on 40 and sometimes higher with my uBitx running just 12 volts to the finals and doing digital.? ?But that thing was about $270...........
As Ashhar pointed out....someone should form a company.? ?Crowd-fund it if you wish.? ? Get printed circuit boards.? (I even learned how to do that!)? ?think about how to make sure it works for every possible mode & application.....
For scanning systems like WINLINK, it would be wonderful if it could move to memory positions on RECEIVE (which means the VFO has to output something, or you have to use a frequency counter to watch it)
For ALE, the freuqncy changes are TOO FAST to follow with relays.
Cheers.
gordon
I agree with Rod...it should have its own Nano. The issue really isn't the processing power, but the ?BITX I/O lines are pretty scarce. Plus, you can buy the Nano for $3, so why not? Finally, it would make the
software development a little easier since could be run "alone" during testing.
Jack, W8TEE
William,
Count me in.
I would be inclined to implement it it a separate case to be used with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem if not, I can simply supply a Nano and make the tuner believe it is 'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go
inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ???
?
?
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
?
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
?
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it:
Like us on Facebook!
?
?
?
?
Good pickups!
?
So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways:
?
1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders
at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.?
?
2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they
work with lots of different kinds of wire.?
?
3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ?
?
4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100
?
5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey.
?
6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from
from 40 meters all the way through 6 meters
?
?
And there are probably many more....
?
Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
|
That was the plan from the start. ?Even with its own nano I need 18 latching digital lines so ill be doing some expanding/latching/mux-ing.?
What I'm struggling with at the moment is using latching relays (expensive) vs the added current from all of the relays if they are not latching. ?Not good for battery ops.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
toggle quoted message
Show quoted text
On Dec 31, 2017, at 7:55 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: I agree with Rod...it should have its own Nano. The issue really isn't the processing power, but the ?BITX I/O lines are pretty scarce. Plus, you can buy the Nano for $3, so why not? Finally, it would make the software development a little easier since could be run "alone" during testing.
Jack, W8TEE
William,
Count me in.
I would be inclined to implement it it a separate case to be used
with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate
into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem
if not, I can simply supply a Nano and make the tuner believe it is
'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your
tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So
after finishing up most of my projects a few days ago¡ I
really needed something to do¡ so I put on the drawing
board¡ a 100w automatic tuner that can work with the uBITx
(intended to go inside the same case actually) that provides
power, SWR, band memory for same antennas, low power tune,
bypass, etc. all in a kit form for about $30.? I¡¯m
prototyping the think now and will work on the
tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work
out some protocol/communication issues¡? but Stay tuned
(double play on words there)! ???
?
?
Dr.
William
J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
?
Owner
- Operator
Big
Signal Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner
¨C Operator
Villa
Grand Piton ¨C J68HZ
Soufriere,
St. Lucia W.I.
Rent
it:
Like us on Facebook!
?
?
?
?
Good
pickups!
?
So
the ALE (automatic link establishment) crowd, much like the
WINLINK crowd, tend to use LOTS of bands....and thus they
find ways to make their antenna systems work on mulltiple
bands.? ?Here are some of the most popular ways:
?
1.?
?Fan Dipoles (time honored technique of tying multiple
dipoles together at the CENTER, and the energy tends to go
to the correct one, since all the others present much higher
impedances.? ?The wires "fan" out with usually wooden
spreaders at the? end and some string involved to keep them
somewhat separate.? ?Been there done that many times, my
college ham club has a 3-band unit up on the top of an 11
story building rightnow that I built for them.? ?Build for
yourself, dirt cheap.?
?
2.?
Auto-tuners? --- everyone makes these now and many can tune
as soon as they see RF, or even return to previous settings
that were memorized.? ?LDG,? and others.? ?Low power
versions for $100? ?End fed wire to balanced line fed
dipoles---they work with lots of different kinds of wire.?
?
3.?
Inherently multiband antennas:? ?example, full wavelength
loops.? ?Build for yourself.? ?
?
4.?
Carefully tuned end-fed transformer-fed antennas --- there
are now several of these on the market and they give an
acceptable SWR on mulltiple harmonically related bands.?
?Tend to be close to $100
?
5.?
(the one I dislike)? resistively terminated folded dipoles
--- these use a resistor to make up for what a folded dipole
can't create and give an SWR that is "acceptable" literally
across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And
they generally are pricey.
?
6.?
There are some multi-band vertical antennas on the market
that are basically vertical fan dipoles, but scrunched up in
a nice package.? ?An elderly ham in my city has one, 32 feet
tall....a gang of us put it up and doggone it does from from
40 meters all the way through 6 meters
?
?
And
there are probably many more....
?
Gordon
An
automatic tuner protects the rig during TX.? If the SWR
is bad during TX, some of the signal coming out of the
transmitter is reflected by the antenna back into the
radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna,
but some good amount of signal still makes into the
radio when receiving, even when the antenna is not
perfect.
So I assume Doc G? is scanning for radio traffic, and
then when he finds some if he wants to transmit he does
something about his SWR for that frequency.
<image001.gif>
|
Yes it will be powered by a Nano and can be used stand-alone with a second Nano for display/interface (showing Power, SWR, status, etc). That way it integrates with the uBITx devices easily and any other radio or stand alone with the second Nano. Even your PC if thats what you prefer.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
toggle quoted message
Show quoted text
On Dec 31, 2017, at 1:49 AM, Rod Self < km6sn@...> wrote:
William,
Count me in.
I would be inclined to implement it it a separate case to be used
with other rigs,also.
What are your (er) current thoughts on separate Nano vs integrate
into ubitx's Nano?
Hope it has its own Nano, and does not rely on the ubitx. No problem
if not, I can simply supply a Nano and make the tuner believe it is
'talking' to the ubitx.
Maybe I will come up with a stand-alone-controller-project for your
tuner, so it can be driven with two wires, start and done.
I am interested in supporting this project.
Regards,
Rod KM6SN
On 12/29/2017 07:05 AM, K9HZ wrote:
So
after finishing up most of my projects a few days ago¡ I
really needed something to do¡ so I put on the drawing
board¡ a 100w automatic tuner that can work with the uBITx
(intended to go inside the same case actually) that provides
power, SWR, band memory for same antennas, low power tune,
bypass, etc. all in a kit form for about $30.? I¡¯m
prototyping the think now and will work on the
tuning/communications code (to integrate into the Raduino)
shortly.? I¡¯ve contacted a few of you off-channel to work
out some protocol/communication issues¡? but Stay tuned
(double play on words there)! ???
?
?
Dr.
William
J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ
?
Owner
- Operator
Big
Signal Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner
¨C Operator
Villa
Grand Piton ¨C J68HZ
Soufriere,
St. Lucia W.I.
Rent
it:
Like us on Facebook!
?
?
email:?
bill@...
?
?
Good
pickups!
?
So
the ALE (automatic link establishment) crowd, much like the
WINLINK crowd, tend to use LOTS of bands....and thus they
find ways to make their antenna systems work on mulltiple
bands.? ?Here are some of the most popular ways:
?
1.?
?Fan Dipoles (time honored technique of tying multiple
dipoles together at the CENTER, and the energy tends to go
to the correct one, since all the others present much higher
impedances.? ?The wires "fan" out with usually wooden
spreaders at the? end and some string involved to keep them
somewhat separate.? ?Been there done that many times, my
college ham club has a 3-band unit up on the top of an 11
story building rightnow that I built for them.? ?Build for
yourself, dirt cheap.?
?
2.?
Auto-tuners? --- everyone makes these now and many can tune
as soon as they see RF, or even return to previous settings
that were memorized.? ?LDG,? and others.? ?Low power
versions for $100? ?End fed wire to balanced line fed
dipoles---they work with lots of different kinds of wire.?
?
3.?
Inherently multiband antennas:? ?example, full wavelength
loops.? ?Build for yourself.? ?
?
4.?
Carefully tuned end-fed transformer-fed antennas --- there
are now several of these on the market and they give an
acceptable SWR on mulltiple harmonically related bands.?
?Tend to be close to $100
?
5.?
(the one I dislike)? resistively terminated folded dipoles
--- these use a resistor to make up for what a folded dipole
can't create and give an SWR that is "acceptable" literally
across EVERY FREQUENCY in a decade of frequencies.? ?3-30
MHz.? ?The tradeoff is loss, as much as 10 db at times.? And
they generally are pricey.
?
6.?
There are some multi-band vertical antennas on the market
that are basically vertical fan dipoles, but scrunched up in
a nice package.? ?An elderly ham in my city has one, 32 feet
tall....a gang of us put it up and doggone it does from from
40 meters all the way through 6 meters
?
?
And
there are probably many more....
?
Gordon
An
automatic tuner protects the rig during TX.? If the SWR
is bad during TX, some of the signal coming out of the
transmitter is reflected by the antenna back into the
radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna,
but some good amount of signal still makes into the
radio when receiving, even when the antenna is not
perfect.
So I assume Doc G? is scanning for radio traffic, and
then when he finds some if he wants to transmit he does
something about his SWR for that frequency.
|
Re: Laser cut ubitx case SVG
?Oh that looks good. I'll see about ordering one and adding it to
the plan, additionally I'm thinking of some vents above and below
the finals. I've not got time to make and sell these, but there
are plenty of hackspaces scattered around the world that can help,
as well as commerical manufacturers of course :)
?Happy new year everyone!
-Cheers, Max.
On 31/12/17 15:16, Doug W wrote:
toggle quoted message
Show quoted text
Very nice Max.
Might I suggest adding a provision for a panel mount USB extension
like this one...
I can fumble around in Inkscape but I am far from proficient at
it.
|
A dual-band transceiver - trcv005.pdf
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
There are several tuner projects based on Arduino.? Here is one.
You can find schematics for almost all the major vendors out there.? The setup / hardware is basically all the same.
The hardware does not seem difficult.? The L match seems to be the most common.? I would use latching relays, so it could use very low power when not tuning, like the Elecraft T1 tuner.? The magic would be in the programming of the tuning subroutines.
Marco - KG5PRT?
On Dec 31, 2017 8:42 AM, "Rod Self" < km6sn@...> wrote: Hi All,
some time ago I built a single-ended version of Farhan's tuner shown here:
It is a basic L network with binary-weighted C and L values, switchable to either Hi or Low Z.
My operational impressions:
1. It is amazingly simple to tune up to an unknown load, and
2. even when the impedance mismatch is severe, switching in another tap of L or C shows easily-readable improvement in reflected voltage, which
3. gives a useful clue as to what to switch next, and
4. it is probably not necessary to use reflected voltage and phase readings- reflected voltage is probably sufficient, and
5. it would be simple to relay drive it and use a Nano to tune it.
So, I decided that when I got around-to-it, I would? automate it with a Nano. It just has not happened yet.
Just some operational feedback.
Regards,
Rod KM6SN
|
Re: #bitx40 #parts need spec's on BITX40 capacitor C7
#bitx40
#parts
Surface mount R's and C's and transistors (such as the mmbt3904 of the uBitx)
are much cheaper than their long-legged cousins.
Here's roughly the same 0805 NP0 470pf cap over on Mouser at $6.40 for 10 (vs his $5 on Amazon)
? ??581-MM051A471JCT2A? ? (a mouser part number)
The advantage of Mouser is you know you are getting a name brand cap and have a datasheet to check other specs.
The 0805 size is one down from the original 1206 size found on the uBitx, but will solder into place easily.
Much of the DIY electronics market is at the 0805 size for surface mount parts.
I find that at comfortable size to work with, can solder them in place easily without special magnification.
The 0603's are still usable, with 0402's my old eyes and blunt instrument soldering iron start having trouble.
I'm quite sure his Amazon purchase will work fine.
Though it's worth getting a DVM with capacitance range for $10 somewhere to double check what got shipped.
When building a kit, I check all the C's and R's before soldering them in place.
? ??
? ??
(I have not tried either one, but do have a cheap $10 DVM with capacitance range that is accurate to about 20pf)
When measuring small value caps, be sure to subtract the reading you get with? just the leads hanging out there.
Jerry
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On Sat, Dec 30, 2017 at 09:21 pm, Gordon Gibby wrote:
wow, you got a great deal!!!? Be sure to specify the capacitance in your order!!!? ?You should have enough to go into business for yourself selling those chips!!!
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K9HZ