Jon,
You will have to do some troubleshooting. First, check the VFO and BFO
signal levels. The VFO should have a 200mVp-p signal (70mV RMS) at U6
pin 6, and the BFO should have a 200mVp-p (70 V RMS) at U5 pin 6. use an
oscilloscope with a 10X probe to measure the peak to peak RF voltage or
an RF probe to measure the RMS voltage.
If it was working when you put it away, the most probable problem is
that there is a marginal solder connection. Re-flow the soldering on
the side of the RF board that is between the crystals and the headphone
jack.
If you have a signal generator that will develop 0 dBm, you should be
able to trace through the signal path with an oscilloscope.
73,
Don W3FPR
On 7/13/2018 6:20 PM, Jon Ayscue wrote:
My KX1 was working fine the last time I used it a couple of years ago. But
when I hooked it up today I discovered it has a dead receiver. All I get is
a hiss if I turn the AF gain all the way up. RF gain is at max, filter at
2.0 khz. Transmit seems to be ok.
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