John,
Those "resonances" appear to be similar to what I observe when the
soundcard input is overdriven.
See what happens if you reduce the audio into the soundcard.
Did you replace the crystals on the RF board as well? If so, I hope you
re-used the insulators under the crystals. They were needed in the
Field Test boards (serial numbers 100 and below) - boards used after the
Field Test had more complete solder masking and were no longer necessary.
73,
Don W3FPR
On 3/19/2014 1:01 PM, Jason V wrote:
Attached a dummy load
and tuned to the 7Mhz birdie. When ever the birdie was within the filter
the resonance would be present, outside it goes away.
Links to screen shots.
No birdie on cw filter. http://goo.gl/qvMGOq
birdie @ ~633 Hz. http://goo.gl/irDakg
birdie @ ~721 Hz. http://goo.gl/lBEacm
So I brought the Radio to work and put it on the IFR 1900 and it Tx's and
Rx's just fine. Probed each of the new crystals and they all appeared fine
as well, steep skirts, consistent width, and no spurs. I have screen shots
of the IFR if needed.
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