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
