Stan,
You might also want to check for cold solder joints in the oscillator circuit. I had the same symptoms
and found a cold solder joint on the ground end of the 2.2K resistor off the emitter of Q2 (this is R5
in the schematic for the older version softrock40 that I built). You might try heating up some of those
joints and making sure they flow nicely to see if that helps.
73,
Kurt KC9FOL
Stan Rife wrote:
toggle quoted message
Show quoted text
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
-----Original Message-----
*From:* softrock40@...
[mailto:softrock40@...] *On Behalf Of *Mike WA8BXN
*Sent:* Thursday, September 29, 2005 11:44 AM
*To:* softrock40@...
*Subject:* Re: [softrock40] Not working: HELP
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
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