??? Thanks Mike. I have just finished double checking
everything, physically. No problems found so far. I am not able to detect the
oscillator at the crystal frequency. I think this, for whatever reason, may be
the culprit.
?
Still
checking,
Stan Rife
W5EWA
Houston, TX
K2 S/N
4216
?
toggle quoted message
Show quoted text
Computers can be
quirky! Try using the microphone input on your computer
instead of the line
input just be be sure thats not what its trying to get
input from. If you
have a scope, feed a signal into the sr40 in its tuning
range and look at
the audio output on the scope, you should see a nice sine
wave. Or if you
have no scope, if you have a signal source near the 7056
frequency, you can
just feed the audio out into an audio amplifier, the sr40
is basically a
wideband direct conversion receiver. If no output that way,
try listening
for the crystal oscillator on the sr40 with a receiver that
tunes 10
meters. If you hear that ok, check carefully the windings on the
toroid bot
for good soldering and proper positioning. Oh, and you might try
tracking
down that problem of no green light on the one usb connection. It
might be
significant. It probably would not be a good idea to try to run the
sr40 on
6 volts from a wall wart, unless its regulated it will probably be
much
more than 6 volts at the light load of the sr40, and even 6 volts
probably
is higher than the max voltage for the chips. Radio shack sells
7808 +5 V
regulators for $1.59, that could be used with a wall wart to get
the right
voltage. Of if you have a self-powered (one that comes with a wall
wart)
usb hub, that could supply power for test purposes.
If you have an
audio oscillator, you can try feeding that into the computer
and you should
see something on the powersdr display to check out the
computer side of
things.
Good luck and let us know what the problem was!
73 -
Mike
WA8BXN
|
??? C6/C7 is ok. I double checked each of these with a LC
Meter IIB as I was putting them in. They both are labeled 101J. C12/C13 are
correct also. I double checked the windings of T1, and it looks ok. I did rewind
it last night thinking that I had made that mistake. Rewound the bifilar with
green enamel wire so I could more easily identify them. Everything ohmed out ok
and I double and triple checked (for what that is worth) before I soldered the
leads. No bad solder joints on?T1. Just now checked that again, as well as
inspecting the entire board for about the 5th time for?cold or unsoldered
joints. I did find that the crystal can MAY have been touching one of the
crystal leads, and I am about to plug it in to see if by chance that was it.
?
Stan Rife
W5EWA
Houston, TX
K2 S/N
4216
?
toggle quoted message
Show quoted text
If you want to run from
a 6 volt wall wart you should consider the
changes by N1RX to substitute a
7805 for Q1 (see
I
have used a USB extension cable to get the device on the bench for
testing.
If I tune my Kenwood TH-F7E to the 3 frequencies and hold
the antenna
within an inch or two of the board I get an S9+
signal.
If there is no clock signal then you should carefully check C6
and C7
are correct (labelled 101J).? If you mistakenly switched C6/C7
with
C12/C13 then the clock will not run.
Recheck T1 connections -
if either 3nad 5 or 4 and 6 are swapped then it
will not work.
--
John? g0orx/n6lyt
Stan Rife wrote:
>
John,
>???? I do not hear a carrier at any of those
freqs. I double checked my
> method by sniffing the XG1 and I hear it
at 7.040. What level would the
> clock frequencies be at? I just have a
peice of coax on my K2 and
> holding it near the SR-40. The XG1 was
pretty loud, but that is a
> 50microvolt sig. I didn't check it at
1microvolt. I have a scope here,
> but am not very well versed at using
it. That is something I have been
> hoping to rectify since I aquired
it. Maybe this is my chance. Hi Hi
>???? Do I need
exactly 5 volts to power the SR-40, or could I use
> something like a 6
volt wall wart? That is the only way I am going to be
> able to get
this thing out on the bench where I can get to it.
>?
>?
> Appreciate the help, John,
>
> Stan
Rife
> W5EWA
> Houston, TX
> K2 S/N 4216
>?
>
>???? -----Original
Message-----
>???? *From:*
softrock40@...
>????
[mailto:softrock40@...] *On Behalf Of *John
Melton
>???? *Sent:* Thursday, September 29, 2005
10:48 AM
>???? *To:*
softrock40@...
>???? *Subject:* Re:
[softrock40] Not working: HELP
>
>???? Hi
Stan,
>
>???? the S9 carrier at 7.056 is
normal (even without the device powered).
>
>???? If you have a scope you can should check the
clock signals that are
>???? shown on the schematic
(QSD Timing Diagram) and also check that they
>????
are
>???? all getting to U5.
>
>???? If you do not have a scope you could tune a
receiver to the 28.224,
>???? 14.112 and 7.056 clock
frequencies to check that they are being
>????
generated but you will not be able to check that they are getting to
U5.
>
>???? If the clocks are OK I would
check the wiring of T1.? I have 2
>????
SoftRock40's? and when I built the first one I did not get
the
>???? wiring of
>????
T1 correct and all looked OK but no signals.
>
>???? Hope that is of some help.
>
>???? Regards,
>
>???? John? g0orx/n6lyt
>
>
>
>
>???? Stan Rife
wrote:
>?????
>?????? I finished the SoftRock last night
and I plugged it in to
>???? one of
my
>????? > USB hubs...no green light from
the LED. I put it back on the
>???? bench
and
>????? > verified everything and all
looked ok. After messing with it for
>???? a while
and
>????? > still not getting a green LED
from my USB hub, I decided to plug
>???? it in
to
>????? > the USB on the back of the
computer...GREEN LIGHT. Wondering why
>???? the USB
hub
>????? > doesn't put out 5 volts, but
will worry about that later. I
>???? thought that
the
>????? > 5 volts daisy chained from
device to device.
>?????
>?????? So, it lit up, but I am not receiving
anything. The latest
>????
binary
>????? > was acting really weird on
my computer, so I reinstalled PowerSDR
>???? and
then
>????? > unzipped the binary's from
August in to the SDR install. It
>???? appears to
work
>????? > ok now, I think. I have no way
of verifying that. All I get is a
>????
little
>????? > background noise (I got this
before though) and a solid S-9
>???? carrier
at
>????? > 7.056, but this is ALL I ever
got from the software whenever I
>???? would
start
>????? > it up with NO hardware. So, I
hope this is making sense, the
>???? SR-40 is
either
>????? > not working properly, or the
software is not working.
>?????
>?????? I can play the canned .wav files and
that works, but
>???? nothing
from
>????? > the SR-40. Made sure my
LINE-IN port on the soundcard was
>???? selected,
and
>????? > checked that the volume was up
sufficiently. I don't know what
>???? else
to
>????? > check, or how to check it. I am
electronically challenged, sorry
>???? guys.
Plus
>????? > it is hard to get back behind
the PC to do anything. I don't have
>???? a 5
volt
>????? > power supply. Can I use a 6
volt wall wart?? I didn't see a 5
>???? volt
regulator
>????? > on the
SR-40.
>?????
>?????? Can someone tell me where to start?
And what about the S-9
>????
carrier
>????? > at 7.056?? Is that supposed
to be there?? I do have an XG-1
>???? signal
source,
>????? > but I'm not getting
anything to the software.
>?????
>
>????? >
Thanks,
>?????
>
>????? > Stan
Rife
>????? >
W5EWA
>????? > Houston,
TX
>????? > K2 S/N
4216
>?????
>
>?????
>
>?????
>
>?????
>
>????
------------------------------------------------------------------------
>?????
> YAHOO! GROUPS LINKS
>?????
>
>????? >????
*? Visit your group "softrock40
>?????
>?????? <>"
on the web.
>?????
>??????
>????? >???? *? To
unsubscribe from this group, send an email
to:
>?????
>???????
softrock40-unsubscribe@...
>?????
>?????
>????
>?????
>??????
>????? >???? *?
Your use of Yahoo! Groups is subject to the Yahoo! Terms
of
>?????
>?????? Service <>.
>?????
>
>?????
>
>?????
>
>????
------------------------------------------------------------------------
>?????
>
>
>
>???? SPONSORED
LINKS
>???? Shortwave
receivers
>???? <>
>????
????? Ham radio
>????
<>
>
>
>
>????
------------------------------------------------------------------------
>????
YAHOO! GROUPS LINKS
>
>???????? *? Visit your
group
"softrock40
>??????????
<>"
on the
web.
>???????????
>???????? *? To
unsubscribe from this group, send an email
to:
>???????????
softrock40-unsubscribe@...
>??????????
>???????????
>???????? *? Your use of
Yahoo! Groups is subject to the Yahoo! Terms
of
>?????????? Service
<>.
>
>
>????
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>
|
Re: SSB demod, was Re: carrirer oscillator
Cecil, I just had a look at the powerSDR-SR40 code. Looking at sdr.c line, I can see that the signal is indeed at 11025 Hz. The RX oscillator runs at -11025 hz. Now, does that mean, the spectrum we can indeed tune to is centered around 7056-11.025 = 7044.9 khz? I am a bit confused here. On 9/29/05, KD5NWA <KD5NWA@...> wrote: The SoftRock itself doesn't convert all input signal to 11,250Hz, it
has a fixed crystal oscillator, were the signal ends up depends where
in the pass-band the original signal is. Some will be at 1KHz some at
5KHz, some at 19KHz depends on how far they are from the center of
the pass-band (7.056MHz). A QRP signal a 7.040 will end up at 16KHz.
On the SDR1000 it's another story, they have a agile oscillator so
they try to keep the signal you are tuned to at 11KHz away from the
crud at at 0Hz.
At 11:26 AM 9/29/2005, you wrote:
--- In softrock40@..., w keith griffith <kgriffit@w...>
wrote:
I have,,, 'SomeWhere' a really good description of the Weaver ssb
method.
There's a decent description of the Weaver method in the DSP section
of all the recent ARRL Handbooks.
How, if at all, does that method compare with the
softrock? The SoftRock itself does no demodulation. All it does is sample the
incoming signal in such a way as to mix down to 11250Hz. The
downconverted signal is then dumped to the computer's soundcard.
In the subsequent software DSP on the digitized signal, the SSB
"demodulation" consists entirely of a bandpass filtering stage and
another mixing stage to spin the signal centered at 11025Hz down to
0Hz.
CW is the same, except the mixing stage spins the signal down to the
CW offset frequency (700Hz or whatever) rather than 0Hz.
73
Frank
AB2KT
Yahoo! Groups Links
Cecil Bayona
KD5NWA
www.qrpradio.com
'Never argue with an idiot. They drag you down to their level then
beat you with experience.'
Yahoo! Groups Links
-- 73 - Ramakrishnan, VU3RDD
|
Re: SSB demod, was Re: carrirer oscillator
On 9/29/05, Frank Brickle <ab2kt@...> wrote: The SoftRock itself does no demodulation. All it does is sample the
incoming signal in such a way as to mix down to 11250Hz. The
downconverted signal is then dumped to the computer's soundcard. Frank, Looking at the picture: I couldn't understand how the mixing down to the magic number 11250 is obtained.. Would you mind explaining it a bit more? What I thought was that the signal at 7.056 gets downconverted to zero IF and because of the soundcard sampling rate of 48 khz, we are able to tune +-24khz.. I guess there is some issue in my understanding. WIll be great if you explain it to me and others. TIA -- 73 - Ramakrishnan, VU3RDD
|
Re: SSB demod, was Re: carrirer oscillator
The SoftRock itself doesn't convert all input signal to 11,250Hz, it has a fixed crystal oscillator, were the signal ends up depends where in the pass-band the original signal is. Some will be at 1KHz some at 5KHz, some at 19KHz depends on how far they are from the center of the pass-band (7.056MHz). A QRP signal a 7.040 will end up at 16KHz. On the SDR1000 it's another story, they have a agile oscillator so they try to keep the signal you are tuned to at 11KHz away from the crud at at 0Hz. At 11:26 AM 9/29/2005, you wrote: --- In softrock40@..., w keith griffith <kgriffit@w...>
wrote:
I have,,, 'SomeWhere' a really good description of the Weaver ssb
method.
There's a decent description of the Weaver method in the DSP section
of all the recent ARRL Handbooks.
How, if at all, does that method compare with the
softrock? The SoftRock itself does no demodulation. All it does is sample the
incoming signal in such a way as to mix down to 11250Hz. The
downconverted signal is then dumped to the computer's soundcard.
In the subsequent software DSP on the digitized signal, the SSB
"demodulation" consists entirely of a bandpass filtering stage and
another mixing stage to spin the signal centered at 11025Hz down to
0Hz.
CW is the same, except the mixing stage spins the signal down to the
CW offset frequency (700Hz or whatever) rather than 0Hz.
73
Frank
AB2KT
Yahoo! Groups Links
Cecil Bayona KD5NWA www.qrpradio.com 'Never argue with an idiot. They drag you down to their level then beat you with experience.'
|
Re: SSB demod, was Re: carrirer oscillator
Thanks,,, very fun following the list. I'm not likely to get involved with this type project at the hardware level, my current interests are mostly tube gear, but current interests do change over time ;-)
toggle quoted message
Show quoted text
At 09:26 AM 9/29/2005, you wrote: --- In softrock40@..., w keith griffith <kgriffit@w...>
wrote:
I have,,, 'SomeWhere' a really good description of the Weaver ssb
method.
There's a decent description of the Weaver method in the DSP section
of all the recent ARRL Handbooks.
How, if at all, does that method compare with the
softrock? The SoftRock itself does no demodulation. All it does is sample the
incoming signal in such a way as to mix down to 11250Hz. The
downconverted signal is then dumped to the computer's soundcard.
In the subsequent software DSP on the digitized signal, the SSB
"demodulation" consists entirely of a bandpass filtering stage and
another mixing stage to spin the signal centered at 11025Hz down to
0Hz.
CW is the same, except the mixing stage spins the signal down to the
CW offset frequency (700Hz or whatever) rather than 0Hz.
73
Frank
AB2KT
|
If you want to run from a 6 volt wall wart you should consider the changes by N1RX to substitute a 7805 for Q1 (see ).
I have used a USB extension cable to get the device on the bench for testing.
If I tune my Kenwood TH-F7E to the 3 frequencies and hold the antenna within an inch or two of the board I get an S9+ signal.
If there is no clock signal then you should carefully check C6 and C7 are correct (labelled 101J). If you mistakenly switched C6/C7 with C12/C13 then the clock will not run.
Recheck T1 connections - if either 3nad 5 or 4 and 6 are swapped then it will not work.
-- John g0orx/n6lyt
Stan Rife wrote:
toggle quoted message
Show quoted text
John,
I do not hear a carrier at any of those freqs. I double checked my method by sniffing the XG1 and I hear it at 7.040. What level would the clock frequencies be at? I just have a peice of coax on my K2 and holding it near the SR-40. The XG1 was pretty loud, but that is a 50microvolt sig. I didn't check it at 1microvolt. I have a scope here, but am not very well versed at using it. That is something I have been hoping to rectify since I aquired it. Maybe this is my chance. Hi Hi
Do I need exactly 5 volts to power the SR-40, or could I use something like a 6 volt wall wart? That is the only way I am going to be able to get this thing out on the bench where I can get to it.
Appreciate the help, John,
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
-----Original Message-----
*From:* softrock40@...
[mailto:softrock40@...] *On Behalf Of *John Melton
*Sent:* Thursday, September 29, 2005 10:48 AM
*To:* softrock40@...
*Subject:* Re: [softrock40] Not working: HELP
Hi Stan,
the S9 carrier at 7.056 is normal (even without the device powered).
If you have a scope you can should check the clock signals that are
shown on the schematic (QSD Timing Diagram) and also check that they
are
all getting to U5.
If you do not have a scope you could tune a receiver to the 28.224,
14.112 and 7.056 clock frequencies to check that they are being
generated but you will not be able to check that they are getting to U5.
If the clocks are OK I would check the wiring of T1. I have 2
SoftRock40's and when I built the first one I did not get the
wiring of
T1 correct and all looked OK but no signals.
Hope that is of some help.
Regards,
John g0orx/n6lyt
Stan Rife wrote:
> I finished the SoftRock last night and I plugged it in to
one of my
> USB hubs...no green light from the LED. I put it back on the
bench and
> verified everything and all looked ok. After messing with it for
a while and
> still not getting a green LED from my USB hub, I decided to plug
it in to
> the USB on the back of the computer...GREEN LIGHT. Wondering why
the USB hub
> doesn't put out 5 volts, but will worry about that later. I
thought that the
> 5 volts daisy chained from device to device.
> So, it lit up, but I am not receiving anything. The latest
binary
> was acting really weird on my computer, so I reinstalled PowerSDR
and then
> unzipped the binary's from August in to the SDR install. It
appears to work
> ok now, I think. I have no way of verifying that. All I get is a
little
> background noise (I got this before though) and a solid S-9
carrier at
> 7.056, but this is ALL I ever got from the software whenever I
would start
> it up with NO hardware. So, I hope this is making sense, the
SR-40 is either
> not working properly, or the software is not working.
> I can play the canned .wav files and that works, but
nothing from
> the SR-40. Made sure my LINE-IN port on the soundcard was
selected, and
> checked that the volume was up sufficiently. I don't know what
else to
> check, or how to check it. I am electronically challenged, sorry
guys. Plus
> it is hard to get back behind the PC to do anything. I don't have
a 5 volt
> power supply. Can I use a 6 volt wall wart?? I didn't see a 5
volt regulator
> on the SR-40.
> Can someone tell me where to start? And what about the S-9
carrier
> at 7.056?? Is that supposed to be there?? I do have an XG-1
signal source,
> but I'm not getting anything to the software.
>
> Thanks,
>
> Stan Rife
> W5EWA
> Houston, TX
> K2 S/N 4216
>
>
>
>
------------------------------------------------------------------------
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>
> * Visit your group "softrock40
> <>" on the web.
> * To unsubscribe from this group, send an email to:
> softrock40-unsubscribe@...
>
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> Service <>.
>
>
>
------------------------------------------------------------------------
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SPONSORED LINKS
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<>
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* Visit your group "softrock40
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<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.
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|
Computers can be quirky! Try using the microphone input on your computer
instead of the line input just be be sure thats not what its trying to get
input from. If you have a scope, feed a signal into the sr40 in its tuning
range and look at the audio output on the scope, you should see a nice sine
wave. Or if you have no scope, if you have a signal source near the 7056
frequency, you can just feed the audio out into an audio amplifier, the sr40
is basically a wideband direct conversion receiver. If no output that way,
try listening for the crystal oscillator on the sr40 with a receiver that
tunes 10 meters. If you hear that ok, check carefully the windings on the
toroid bot for good soldering and proper positioning. Oh, and you might try
tracking down that problem of no green light on the one usb connection. It
might be significant. It probably would not be a good idea to try to run the
sr40 on 6 volts from a wall wart, unless its regulated it will probably be
much more than 6 volts at the light load of the sr40, and even 6 volts
probably is higher than the max voltage for the chips. Radio shack sells
7808 +5 V regulators for $1.59, that could be used with a wall wart to get
the right voltage. Of if you have a self-powered (one that comes with a wall
wart) usb hub, that could supply power for test purposes.
If you have an audio oscillator, you can try feeding that into the computer
and you should see something on the powersdr display to check out the
computer side of things.
Good luck and let us know what the problem was!
73 - Mike WA8BXN
|
SSB demod, was Re: carrirer oscillator
--- In softrock40@..., w keith griffith <kgriffit@w...> wrote:
I have,,, 'SomeWhere' a really good description of the Weaver ssb
method.
There's a decent description of the Weaver method in the DSP section of all the recent ARRL Handbooks. How, if at all, does that method compare with the
softrock? The SoftRock itself does no demodulation. All it does is sample the incoming signal in such a way as to mix down to 11250Hz. The downconverted signal is then dumped to the computer's soundcard. In the subsequent software DSP on the digitized signal, the SSB "demodulation" consists entirely of a bandpass filtering stage and another mixing stage to spin the signal centered at 11025Hz down to 0Hz. CW is the same, except the mixing stage spins the signal down to the CW offset frequency (700Hz or whatever) rather than 0Hz. 73 Frank AB2KT
|
??? I forgot to add that I rewound T1 last evening
thinking that might have been a problem. I wound the bifilar with green wire
this time, that I had left over from the K2 kit. I could identify the windings
MUCH better.
?
?
Stan Rife
W5EWA
Houston, TX
K2 S/N
4216
?
toggle quoted message
Show quoted text
Hi Stan,
the S9
carrier at 7.056 is normal (even without the device powered).
If you
have a scope you can should check the clock signals that are
shown on the
schematic (QSD Timing Diagram) and also check that they are
all getting to
U5.
If you do not have a scope you could tune a receiver to the 28.224,
14.112 and 7.056 clock frequencies to check that they are being
generated but you will not be able to check that they are getting to
U5.
If the clocks are OK I would check the wiring of T1.? I have 2
SoftRock40's? and when I built the first one I did not get the wiring
of
T1 correct and all looked OK but no signals.
Hope that is of
some help.
Regards,
John?
g0orx/n6lyt
Stan Rife
wrote:
>?????? I finished the SoftRock
last night and I plugged it in to one of my
> USB hubs...no green light
from the LED. I put it back on the bench and
> verified everything and
all looked ok. After messing with it for a while and
> still not getting
a green LED from my USB hub, I decided to plug it in to
> the USB on the
back of the computer...GREEN LIGHT. Wondering why the USB hub
> doesn't
put out 5 volts, but will worry about that later. I thought that the
> 5
volts daisy chained from device to
device.
>?????? So, it lit up, but I am
not receiving anything. The latest binary
> was acting really weird on
my computer, so I reinstalled PowerSDR and then
> unzipped the binary's
from August in to the SDR install. It appears to work
> ok now, I think.
I have no way of verifying that. All I get is a little
> background
noise (I got this before though) and a solid S-9 carrier at
> 7.056, but
this is ALL I ever got from the software whenever I would start
> it up
with NO hardware. So, I hope this is making sense, the SR-40 is either
>
not working properly, or the software is not
working.
>?????? I can play the canned
.wav files and that works, but nothing from
> the SR-40. Made sure my
LINE-IN port on the soundcard was selected, and
> checked that the
volume was up sufficiently. I don't know what else to
> check, or how to
check it. I am electronically challenged, sorry guys. Plus
> it is hard
to get back behind the PC to do anything. I don't have a 5 volt
> power
supply. Can I use a 6 volt wall wart?? I didn't see a 5 volt regulator
>
on the SR-40.
>?????? Can someone tell me
where to start? And what about the S-9 carrier
> at 7.056?? Is that
supposed to be there?? I do have an XG-1 signal source,
> but I'm not
getting anything to the software.
>
> Thanks,
>
>
Stan Rife
> W5EWA
> Houston, TX
> K2 S/N 4216
>
>
>
>
------------------------------------------------------------------------
>
YAHOO! GROUPS LINKS
>
>???? *? Visit
your group "softrock40
>?????? <>"
on the web.
>???????
>???? *? To unsubscribe from this group, send
an email to:
>???????
softrock40-unsubscribe@...
>??????
>???????
>???? *? Your use of Yahoo! Groups is subject
to the Yahoo! Terms of
>?????? Service
<>.
>
>
>
------------------------------------------------------------------------
>
|
John,
??? I do not hear a carrier at any of those freqs. I double
checked my method by sniffing the XG1 and I hear it at 7.040. What level
would?the clock frequencies be at? I just have a peice of coax on my K2 and
holding it near the SR-40.?The XG1 was pretty loud, but that is a
50microvolt sig. I didn't check it at 1microvolt. I have a scope here, but am
not very well versed at using it. That is something I have been hoping to
rectify since I aquired it. Maybe this is my chance. Hi Hi
??? Do I need?exactly 5 volts to power the SR-40, or could
I use something like a 6 volt wall wart? That is the only way I am going to be
able to get this thing out on the bench where I can get to it.
?
?
Appreciate the help, John,
Stan Rife
W5EWA
Houston, TX
K2 S/N
4216
?
toggle quoted message
Show quoted text
Hi Stan,
the S9
carrier at 7.056 is normal (even without the device powered).
If you
have a scope you can should check the clock signals that are
shown on the
schematic (QSD Timing Diagram) and also check that they are
all getting to
U5.
If you do not have a scope you could tune a receiver to the 28.224,
14.112 and 7.056 clock frequencies to check that they are being
generated but you will not be able to check that they are getting to
U5.
If the clocks are OK I would check the wiring of T1.? I have 2
SoftRock40's? and when I built the first one I did not get the wiring
of
T1 correct and all looked OK but no signals.
Hope that is of
some help.
Regards,
John?
g0orx/n6lyt
Stan Rife
wrote:
>?????? I finished the SoftRock
last night and I plugged it in to one of my
> USB hubs...no green light
from the LED. I put it back on the bench and
> verified everything and
all looked ok. After messing with it for a while and
> still not getting
a green LED from my USB hub, I decided to plug it in to
> the USB on the
back of the computer...GREEN LIGHT. Wondering why the USB hub
> doesn't
put out 5 volts, but will worry about that later. I thought that the
> 5
volts daisy chained from device to
device.
>?????? So, it lit up, but I am
not receiving anything. The latest binary
> was acting really weird on
my computer, so I reinstalled PowerSDR and then
> unzipped the binary's
from August in to the SDR install. It appears to work
> ok now, I think.
I have no way of verifying that. All I get is a little
> background
noise (I got this before though) and a solid S-9 carrier at
> 7.056, but
this is ALL I ever got from the software whenever I would start
> it up
with NO hardware. So, I hope this is making sense, the SR-40 is either
>
not working properly, or the software is not
working.
>?????? I can play the canned
.wav files and that works, but nothing from
> the SR-40. Made sure my
LINE-IN port on the soundcard was selected, and
> checked that the
volume was up sufficiently. I don't know what else to
> check, or how to
check it. I am electronically challenged, sorry guys. Plus
> it is hard
to get back behind the PC to do anything. I don't have a 5 volt
> power
supply. Can I use a 6 volt wall wart?? I didn't see a 5 volt regulator
>
on the SR-40.
>?????? Can someone tell me
where to start? And what about the S-9 carrier
> at 7.056?? Is that
supposed to be there?? I do have an XG-1 signal source,
> but I'm not
getting anything to the software.
>
> Thanks,
>
>
Stan Rife
> W5EWA
> Houston, TX
> K2 S/N 4216
>
>
>
>
------------------------------------------------------------------------
>
YAHOO! GROUPS LINKS
>
>???? *? Visit
your group "softrock40
>?????? <>"
on the web.
>???????
>???? *? To unsubscribe from this group, send
an email to:
>???????
softrock40-unsubscribe@...
>??????
>???????
>???? *? Your use of Yahoo! Groups is subject
to the Yahoo! Terms of
>?????? Service
<>.
>
>
>
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|
Hi Stan,
the S9 carrier at 7.056 is normal (even without the device powered).
If you have a scope you can should check the clock signals that are shown on the schematic (QSD Timing Diagram) and also check that they are all getting to U5.
If you do not have a scope you could tune a receiver to the 28.224, 14.112 and 7.056 clock frequencies to check that they are being generated but you will not be able to check that they are getting to U5.
If the clocks are OK I would check the wiring of T1. I have 2 SoftRock40's and when I built the first one I did not get the wiring of T1 correct and all looked OK but no signals.
Hope that is of some help.
Regards,
John g0orx/n6lyt
Stan Rife wrote:
toggle quoted message
Show quoted text
I finished the SoftRock last night and I plugged it in to one of my
USB hubs...no green light from the LED. I put it back on the bench and
verified everything and all looked ok. After messing with it for a while and
still not getting a green LED from my USB hub, I decided to plug it in to
the USB on the back of the computer...GREEN LIGHT. Wondering why the USB hub
doesn't put out 5 volts, but will worry about that later. I thought that the
5 volts daisy chained from device to device.
So, it lit up, but I am not receiving anything. The latest binary
was acting really weird on my computer, so I reinstalled PowerSDR and then
unzipped the binary's from August in to the SDR install. It appears to work
ok now, I think. I have no way of verifying that. All I get is a little
background noise (I got this before though) and a solid S-9 carrier at
7.056, but this is ALL I ever got from the software whenever I would start
it up with NO hardware. So, I hope this is making sense, the SR-40 is either
not working properly, or the software is not working.
I can play the canned .wav files and that works, but nothing from
the SR-40. Made sure my LINE-IN port on the soundcard was selected, and
checked that the volume was up sufficiently. I don't know what else to
check, or how to check it. I am electronically challenged, sorry guys. Plus
it is hard to get back behind the PC to do anything. I don't have a 5 volt
power supply. Can I use a 6 volt wall wart?? I didn't see a 5 volt regulator
on the SR-40.
Can someone tell me where to start? And what about the S-9 carrier
at 7.056?? Is that supposed to be there?? I do have an XG-1 signal source,
but I'm not getting anything to the software.
Thanks,
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
------------------------------------------------------------------------
YAHOO! GROUPS LINKS
* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.
------------------------------------------------------------------------
|
I finished the SoftRock last night and I plugged it in to one of my
USB hubs...no green light from the LED. I put it back on the bench and
verified everything and all looked ok. After messing with it for a while and
still not getting a green LED from my USB hub, I decided to plug it in to
the USB on the back of the computer...GREEN LIGHT. Wondering why the USB hub
doesn't put out 5 volts, but will worry about that later. I thought that the
5 volts daisy chained from device to device.
So, it lit up, but I am not receiving anything. The latest binary
was acting really weird on my computer, so I reinstalled PowerSDR and then
unzipped the binary's from August in to the SDR install. It appears to work
ok now, I think. I have no way of verifying that. All I get is a little
background noise (I got this before though) and a solid S-9 carrier at
7.056, but this is ALL I ever got from the software whenever I would start
it up with NO hardware. So, I hope this is making sense, the SR-40 is either
not working properly, or the software is not working.
I can play the canned .wav files and that works, but nothing from
the SR-40. Made sure my LINE-IN port on the soundcard was selected, and
checked that the volume was up sufficiently. I don't know what else to
check, or how to check it. I am electronically challenged, sorry guys. Plus
it is hard to get back behind the PC to do anything. I don't have a 5 volt
power supply. Can I use a 6 volt wall wart?? I didn't see a 5 volt regulator
on the SR-40.
Can someone tell me where to start? And what about the S-9 carrier
at 7.056?? Is that supposed to be there?? I do have an XG-1 signal source,
but I'm not getting anything to the software.
Thanks,
Stan Rife
W5EWA
Houston, TX
K2 S/N 4216
|
--- In softrock40@..., KY1K <ky1k@p...> wrote: OK, now I'm really confused........... Oh, and remember: Shannon's Theorem only addresses bandwidth, not absolute frequency. Having the signal sampled in quadrature means the phase of the signal is disambiguated, since the I and Q parts are Hilbert Transforms of one another (all frequencies are 90 degrees out of phase with one another), and therefore they have different symmetries around 0. With real signals, which have even symmetry, you don't know which is positive and which is negative -- they're effectively the same whether you regard time as running forward or backward. With complex signals, you know which direction is earlier and which is later. (That, btw, is one theoretical reason for preferring complex sampling. Signals in quadrature are much easier to deal with when they include time-dependent modulation and transients.) That means that positive and negative frequencies are not mirrors of one another, as they are with real-only sampling. The total bandwidth is still 48kHz, so the frequency excursion is +/-(48/2)kHz. 73 Frank AB2KT
|
--- In softrock40@..., KY1K <ky1k@p...> wrote: OK, now I'm really confused........... Welcome to the club :-) If I fire up my softrock-40 on my computer that has the ability to
sample at 48 Khz (with the center frequency at 7056 KHz).... Yes to all. I thought only a 96 Khz bandwidth card would give a 48 KHz spectral display.... Here's the deal. Shannon's Theorem tells you that you need 2N bits/sec to capture N bits of bandwidth. If you're only sampling the real part, ie in mono, that means you need to sample at 2F to capture a bandwidth of F. However, since the QSD samples in Quadrature, you're getting a *complex* signal, ie stereo. Those are your 2N bits, 2 channels x N bits/channel. Therefore with complex sampling you can sample at F to capture bandwidth F. It doesn't save anything in terms of the *total* bandwidth, which is still 2N bits, but it lets you use D/A converters only half as fast. Except you need two of them. 73 Frank AB2KT
|
Normally yes, to sample 48KHz signals you need 96KHz sampling rate, but the I and Q are quadrature signals and are only at 24 KHz each.
7036KHz 20 KHz signal
7046KHz 10 KHz signal
7056KHz 0 KHz Signal
7066KHz 10 KHz Signal
7076KHz 20 KHz Signal
Normally you can see that a signal at 7036 and 7076 each give a 20KHz signal so you have a image problem. But because the signals are in quadrature, one signal lags the other if your below the sampling signal, and it leads if it's above the sampling frequency. The computer program looks at both signals and figures where each signal is in frequency so it can tell the lower image from the upper image.
But because each signal is only 24 KHz then 48KHz sampling does fine with each of I and Q signals.
If you sampled at 96 KHz and the integrating capacitor was not too big then you would be able to look a a 96 KHz band of signals, 48KHz below the quadrature clock and 48KHz above. You would need to modify the integrating capacitor and analog filters to allow a 48 KHz signal without attenuation.
Now a lot of sound cards can sample at 96Khz but that doesn't mean that their amplifiers are capable of passing a 48KHz signal faithfully, you need to be careful in picking your audio card.
Around 7056 you end up with a lot of garbage, because any hum and harmonics show up in that area, and if your signals are not well balanced you can end up picking some of the clock signals making it look like there is a carrier there. Good shielding and elimination of ground loops can help.
Hope that helps.
toggle quoted message
Show quoted text
OK, now I'm really confused...........
One question..........
If I fire up my softrock-40 on my computer that has the ability to
sample at 48 Khz (with the center frequency at 7056 KHz)....
Will I be able to listen to a cw station on 7056 Khz (down 10 KHz)?
Will I be able to listen to a cw station on 7046 KHz (down 20 Khz)?
Will I be able to listen to a cw station on 7066 KHz (up 10 Khz)?
Will I be able to listen to a cw station on 7076 KHz (up 20 Khz)
I thought only a 96 Khz bandwidth card would give a 48 KHz spectral display....
Thanks,
Art
At 07:35 PM 9/28/2005, you wrote:
--
Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
|
WOW, thanks Tony.
It's good news for me. I have been designing a crystal oscillator coupled to a divide by N counter. I had assumed no more than 24 Khz (12 KHz on each side of the center frequency).
It turns out that a simple divide by N counter and a crystal oscillator can enable LF operation from 200 KHz down to DC without phase noise and without spurs, except for the phase noise associated with the quartz crystal itself, which is pretty minimal. And, it's cheap and simple to build too.
So, I hope to fire my softrock-40 up on LF soon after testing the stock unit on 40 M.
Regards,
Art
toggle quoted message
Show quoted text
At 09:10 PM 9/28/2005, you wrote: Hi Art,
Yes to all for questions below. Both I and Q channels are being
individually sampled at 48 kHz which provides for the 48 kHz of bandwidth.
73,
Tony KB9YIG
----- Original Message -----
From: "KY1K" <ky1k@...>
To: <softrock40@...>
Sent: Wednesday, September 28, 2005 7:37 PM
Subject: Re: [softrock40] carrirer oscillator
OK, now I'm really confused...........
One question..........
If I fire up my softrock-40 on my computer that has the ability to
sample at 48 Khz (with the center frequency at 7056 KHz)....
Will I be able to listen to a cw station on 7056 Khz (down 10 KHz)?
Will I be able to listen to a cw station on 7046 KHz (down 20 Khz)?
Will I be able to listen to a cw station on 7066 KHz (up 10 Khz)?
Will I be able to listen to a cw station on 7076 KHz (up 20 Khz)
I thought only a 96 Khz bandwidth card would give a 48 KHz spectral
display....
Thanks,
Art
At 07:35 PM 9/28/2005, you wrote:
The audio out of the I and Q signals have a 24KHz bandwidth, but
their relationship tell the PC if the signal is above or below the
quadrature clock. Those two signals together represent a 48 KHz swath
of radio signals. Not each having 24KHz of the spectrum, but together
they have 48KHz.
The PC is able to "put" a phoney carrier anywhere in that 48KHz space
so that the signal is demodulated correctly into audio.
But whether you have a crystal that is low or one that is high, it
makes no difference as long as the signal is in the band-pass, you
still need USB and LSB demodulation. That crystal just sets the
center of the frequency range that you are looking at.
It's kind like looking at book but you have a piece of cardboard with
a rectangle cut in it, as you move that piece of cardboard you see
different parts of the book. A word may be on the right side of the
rectangle but when you move the cardboard its on the left side now,
but the letters don't reverse do they? The signals just move their
position in the frequency spectrum as you move the crystal frequency,
you still need USB and LSB decoders.
Somebody else feel free to try to explain how it works. There are
plenty of people on this list that are more knowledgeable than I am.
If you shift the desired signal up or down in freq you would need to
shift it back
to its natural audio freq spectrum
IF = 8330 kHz center of pass band
Suppose SSB signl .3 - 2 kHz
output IF filter 8330.3 - 8332 kHz depending on tuning
front end IF BW > 2 kHz
softrock board xtal 8352 kHz or 8318 kHz
output from board I and Q : 11.7 kHz - 10.0 kHz
USB -> LSB
In order to copy the I/O signal it needs to be shifted back to .3
to
2 kHz by "mixing"
My question was what is the freq. range of this "mixing" process in
the powerSDR software,.
the computer
The same case can be made for the use of a softrock crystal of
8318
kHz In that case there would be
no side band switch.
73 Rein W6/PA0ZN
KD5NWA wrote:
The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.
The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.
The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on
the
crystal.
At 03:20 PM 9/28/2005, you wrote:
>Hi All,
>
>Question. Does Power SDR software provide a "Variable Beat or
Carrier
>Oscillator"? Perhaps 2 ?
>What is the freq range of that oscillator ( up to 48 or 96 kHz ? )
>
>73 Rein W6/PA0ZN
>
>KD5NWA wrote:
>
> > It would only let me see 6.5 KHz on one side.
> >
> > I'm going to try putting two crystals in parallel, and try to
pull
> > them so I can get at least 10 KHz on either side of the IF, the > > > crystals are cheap enough. I'll get the ones that are close to
the
> > center of the IF and pull them down. I'll also buy one that is
> > 68.8KHz lower than the 4X IF frequency, just in case.
> >
> > At 01:58 PM 9/28/2005, Tony Parks wrote:
> > >Cecil,
> > >
> > >The crystal that is 17 kHz low would work well if you are meaning the
> > >crystal is 68 kHz low at its fundamental frequency. Seventeen
kHz
> > low even
> > >at its fundamental frequency would still probably be ok.
> > >
> > >
> > >----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com
'Never argue with an idiot. They drag you down to their level then
beat you with experience.'
>
------------------------------------------------------------------------
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* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.
>
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Yahoo! Groups Links
--
Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time
...
Yahoo! Groups Links
--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.8/113 - Release Date: 9/27/2005
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.8/113 - Release Date: 9/27/2005
Yahoo! Groups Links
Yahoo! Groups Links
|
Hi Art,
Yes to all for questions below. Both I and Q channels are being individually sampled at 48 kHz which provides for the 48 kHz of bandwidth.
73,
Tony KB9YIG
toggle quoted message
Show quoted text
----- Original Message ----- From: "KY1K" <ky1k@...> To: <softrock40@...> Sent: Wednesday, September 28, 2005 7:37 PM Subject: Re: [softrock40] carrirer oscillator OK, now I'm really confused...........
One question..........
If I fire up my softrock-40 on my computer that has the ability to
sample at 48 Khz (with the center frequency at 7056 KHz)....
Will I be able to listen to a cw station on 7056 Khz (down 10 KHz)?
Will I be able to listen to a cw station on 7046 KHz (down 20 Khz)?
Will I be able to listen to a cw station on 7066 KHz (up 10 Khz)?
Will I be able to listen to a cw station on 7076 KHz (up 20 Khz)
I thought only a 96 Khz bandwidth card would give a 48 KHz spectral display....
Thanks,
Art
At 07:35 PM 9/28/2005, you wrote:
The audio out of the I and Q signals have a 24KHz bandwidth, but
their relationship tell the PC if the signal is above or below the
quadrature clock. Those two signals together represent a 48 KHz swath
of radio signals. Not each having 24KHz of the spectrum, but together
they have 48KHz.
The PC is able to "put" a phoney carrier anywhere in that 48KHz space
so that the signal is demodulated correctly into audio.
But whether you have a crystal that is low or one that is high, it
makes no difference as long as the signal is in the band-pass, you
still need USB and LSB demodulation. That crystal just sets the
center of the frequency range that you are looking at.
It's kind like looking at book but you have a piece of cardboard with
a rectangle cut in it, as you move that piece of cardboard you see
different parts of the book. A word may be on the right side of the
rectangle but when you move the cardboard its on the left side now,
but the letters don't reverse do they? The signals just move their
position in the frequency spectrum as you move the crystal frequency,
you still need USB and LSB decoders.
Somebody else feel free to try to explain how it works. There are
plenty of people on this list that are more knowledgeable than I am.
If you shift the desired signal up or down in freq you would need to
shift it back
to its natural audio freq spectrum
IF = 8330 kHz center of pass band
Suppose SSB signl .3 - 2 kHz
output IF filter 8330.3 - 8332 kHz depending on tuning
front end IF BW > 2 kHz
softrock board xtal 8352 kHz or 8318 kHz
output from board I and Q : 11.7 kHz - 10.0 kHz
USB -> LSB
In order to copy the I/O signal it needs to be shifted back to .3 to
2 kHz by "mixing"
My question was what is the freq. range of this "mixing" process in
the powerSDR software,.
the computer
The same case can be made for the use of a softrock crystal of 8318
kHz In that case there would be
no side band switch.
73 Rein W6/PA0ZN
KD5NWA wrote:
The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.
The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.
The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on the
crystal.
At 03:20 PM 9/28/2005, you wrote:
>Hi All,
>
>Question. Does Power SDR software provide a "Variable Beat or
Carrier
>Oscillator"? Perhaps 2 ?
>What is the freq range of that oscillator ( up to 48 or 96 kHz ? )
>
>73 Rein W6/PA0ZN
>
>KD5NWA wrote:
>
> > It would only let me see 6.5 KHz on one side.
> >
> > I'm going to try putting two crystals in parallel, and try to
pull
> > them so I can get at least 10 KHz on either side of the IF, the > > > crystals are cheap enough. I'll get the ones that are close to
the
> > center of the IF and pull them down. I'll also buy one that is
> > 68.8KHz lower than the 4X IF frequency, just in case.
> >
> > At 01:58 PM 9/28/2005, Tony Parks wrote:
> > >Cecil,
> > >
> > >The crystal that is 17 kHz low would work well if you are meaning the
> > >crystal is 68 kHz low at its fundamental frequency. Seventeen
kHz
> > low even
> > >at its fundamental frequency would still probably be ok.
> > >
> > >
> > >----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com
'Never argue with an idiot. They drag you down to their level then
beat you with experience.'
> ------------------------------------------------------------------------
YAHOO! GROUPS LINKS
* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.
> ------------------------------------------------------------------------
Yahoo! Groups Links
--
Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time
...
Yahoo! Groups Links
--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.8/113 - Release Date: 9/27/2005
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.8/113 - Release Date: 9/27/2005
Yahoo! Groups Links
|
OK, now I'm really confused...........
One question..........
If I fire up my softrock-40 on my computer that has the ability to sample at 48 Khz (with the center frequency at 7056 KHz)....
Will I be able to listen to a cw station on 7056 Khz (down 10 KHz)?
Will I be able to listen to a cw station on 7046 KHz (down 20 Khz)?
Will I be able to listen to a cw station on 7066 KHz (up 10 Khz)?
Will I be able to listen to a cw station on 7076 KHz (up 20 Khz)
I thought only a 96 Khz bandwidth card would give a 48 KHz spectral display....
Thanks,
Art
toggle quoted message
Show quoted text
At 07:35 PM 9/28/2005, you wrote: The audio out of the I and Q signals have a 24KHz bandwidth, but
their relationship tell the PC if the signal is above or below the
quadrature clock. Those two signals together represent a 48 KHz swath
of radio signals. Not each having 24KHz of the spectrum, but together
they have 48KHz.
The PC is able to "put" a phoney carrier anywhere in that 48KHz space
so that the signal is demodulated correctly into audio.
But whether you have a crystal that is low or one that is high, it
makes no difference as long as the signal is in the band-pass, you
still need USB and LSB demodulation. That crystal just sets the
center of the frequency range that you are looking at.
It's kind like looking at book but you have a piece of cardboard with
a rectangle cut in it, as you move that piece of cardboard you see
different parts of the book. A word may be on the right side of the
rectangle but when you move the cardboard its on the left side now,
but the letters don't reverse do they? The signals just move their
position in the frequency spectrum as you move the crystal frequency,
you still need USB and LSB decoders.
Somebody else feel free to try to explain how it works. There are
plenty of people on this list that are more knowledgeable than I am.
If you shift the desired signal up or down in freq you would need to
shift it back
to its natural audio freq spectrum
IF = 8330 kHz center of pass band
Suppose SSB signl .3 - 2 kHz
output IF filter 8330.3 - 8332 kHz depending on tuning
front end IF BW > 2 kHz
softrock board xtal 8352 kHz or 8318 kHz
output from board I and Q : 11.7 kHz - 10.0 kHz
USB -> LSB
In order to copy the I/O signal it needs to be shifted back to .3 to
2 kHz by "mixing"
My question was what is the freq. range of this "mixing" process in
the powerSDR software,.
the computer
The same case can be made for the use of a softrock crystal of 8318
kHz In that case there would be
no side band switch.
73 Rein W6/PA0ZN
KD5NWA wrote:
The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.
The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.
The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on the
crystal.
At 03:20 PM 9/28/2005, you wrote:
>Hi All,
>
>Question. Does Power SDR software provide a "Variable Beat or Carrier
>Oscillator"? Perhaps 2 ?
>What is the freq range of that oscillator ( up to 48 or 96 kHz ? )
>
>73 Rein W6/PA0ZN
>
>KD5NWA wrote:
>
> > It would only let me see 6.5 KHz on one side.
> >
> > I'm going to try putting two crystals in parallel, and try to pull
> > them so I can get at least 10 KHz on either side of the IF, the > > > crystals are cheap enough. I'll get the ones that are close to the
> > center of the IF and pull them down. I'll also buy one that is
> > 68.8KHz lower than the 4X IF frequency, just in case.
> >
> > At 01:58 PM 9/28/2005, Tony Parks wrote:
> > >Cecil,
> > >
> > >The crystal that is 17 kHz low would work well if you are meaning the
> > >crystal is 68 kHz low at its fundamental frequency. Seventeen kHz
> > low even
> > >at its fundamental frequency would still probably be ok.
> > >
> > >
> > >----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com
'Never argue with an idiot. They drag you down to their level then
beat you with experience.'
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Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time
...
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The PC is able to "put" a phoney carrier anywhere in that 48KHz space
so that the signal is demodulated correctly into audio.
This is the answer I wanted to know for the POwerSDR sotfware. Thanks.
kd5nwa wrote:
toggle quoted message
Show quoted text
The audio out of the I and Q signals have a 24KHz bandwidth, but
their relationship tell the PC if the signal is above or below the
quadrature clock. Those two signals together represent a 48 KHz swath
of radio signals. Not each having 24KHz of the spectrum, but together
they have 48KHz.
The PC is able to "put" a phoney carrier anywhere in that 48KHz space
so that the signal is demodulated correctly into audio.
But whether you have a crystal that is low or one that is high, it
makes no difference as long as the signal is in the band-pass, you
still need USB and LSB demodulation. That crystal just sets the
center of the frequency range that you are looking at.
It's kind like looking at book but you have a piece of cardboard with
a rectangle cut in it, as you move that piece of cardboard you see
different parts of the book. A word may be on the right side of the
rectangle but when you move the cardboard its on the left side now,
but the letters don't reverse do they? The signals just move their
position in the frequency spectrum as you move the crystal frequency,
you still need USB and LSB decoders.
Somebody else feel free to try to explain how it works. There are
plenty of people on this list that are more knowledgeable than I am.
If you shift the desired signal up or down in freq you would need to
shift it back
to its natural audio freq spectrum
IF = 8330 kHz center of pass band
Suppose SSB signl .3 - 2 kHz
output IF filter 8330.3 - 8332 kHz depending on tuning
front end IF BW > 2 kHz
softrock board xtal 8352 kHz or 8318 kHz
output from board I and Q : 11.7 kHz - 10.0 kHz USB -> LSB
In order to copy the I/O signal it needs to be shifted back to .3 to
2 kHz by "mixing"
My question was what is the freq. range of this "mixing" process in
the powerSDR software,.
the computer
The same case can be made for the use of a softrock crystal of 8318
kHz In that case there would be
no side band switch.
73 Rein W6/PA0ZN
KD5NWA wrote:
The radio is simplicity itself, and it receives a band of signals
that is 48KHz wide, it has only one oscillator, the rest is faked by
the computer. The radio has two signals it puts out, I and Q that
are sampled by a sound card taking samples of both channels at a rate
of 48KHz, after the computer reads those two signals it figures out
the rest in it's program.
The SR-40 has a oscillator that is used in creating a quadrature
phased clock at the center of the band that you are interested in.
This clock is used to extract the I and Q signals in the frequency
range of interest, the detectors, injection of carrier, filtering ,
etc all the typical added on hardware of a radio is handled by the
software in the PC. This makes the radio hardware very simple,
"Elegance through simplicity" as I like to say of simple designs that
do the job well.
The main Osc. is crystal controlled and divided by 4 to generate
clocks in Quadrature to "detect" the signals in the frequency range
of interest. Some of us are trying to find the appropriate crystals
so we can move the frequency of the receiver to our area of interest.
In my case I want on to be able to look at the IF frequency range of
Kenwood HF radios, that frequency is 8.830MHz, I need some crystals a
little higher or lower than 4 times that frequency (around 35.3 MHz),
not an easy task if you are not willing to spend a lot of money on the
crystal.
At 03:20 PM 9/28/2005, you wrote:
>Hi All,
>
>Question. Does Power SDR software provide a "Variable Beat or Carrier
>Oscillator"? Perhaps 2 ?
>What is the freq range of that oscillator ( up to 48 or 96 kHz ? )
>
>73 Rein W6/PA0ZN
>
>KD5NWA wrote:
>
> > It would only let me see 6.5 KHz on one side.
> >
> > I'm going to try putting two crystals in parallel, and try to pull
> > them so I can get at least 10 KHz on either side of the IF, the > > > crystals are cheap enough. I'll get the ones that are close to the
> > center of the IF and pull them down. I'll also buy one that is
> > 68.8KHz lower than the 4X IF frequency, just in case.
> >
> > At 01:58 PM 9/28/2005, Tony Parks wrote:
> > >Cecil,
> > >
> > >The crystal that is 17 kHz low would work well if you are
meaning the
> > >crystal is 68 kHz low at its fundamental frequency.
Seventeen kHz
> > low even
> > >at its fundamental frequency would still probably be ok.
> > >
> > >
> > >----- Original Message -----
Cecil Bayona
KD5NWA
www.qrpradio.com
'Never argue with an idiot. They drag you down to their level then
beat you with experience.'
------------------------------------------------------------------------
YAHOO! GROUPS LINKS
* Visit your group "softrock40
<>" on the web.
* To unsubscribe from this group, send an email to:
softrock40-unsubscribe@...
<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service <>.
------------------------------------------------------------------------
Yahoo! Groups Links
--
Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time
...
SPONSORED LINKS
Shortwave receivers <> Ham radio <>
------------------------------------------------------------------------
YAHOO! GROUPS LINKS
* Visit your group "softrock40
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<mailto:softrock40-unsubscribe@...?subject=Unsubscribe>
* Your use of Yahoo! Groups is subject to the Yahoo! Terms of
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Ramakrishnan Muthukrishnan