[Collins] KWM-2 #518

[Ray LaRue]

Well after the several bad tubes, cleaning the relay contacts and 
finding a "bad" spot on the 2nd receiver mixer gain pot, I got it 
receiving.  Sensitivity seems now normal.

I haven't tried to load the any transmitter yet, only checked the idling 
current and PA resonance.  They seem OK.

There are yet a few more problems on receive though:

1.  The exciter drive peaking works well on receive, 40 meters and up, 
but when peaking on any on the three 80 meter bands, there are numerous 
very strong birdies (15 or 20) and several places on each band where the 
receiver goes into feedback like oscillations.  This is with or without 
the antenna connected, or with the siggen only.

2.  There is little or no S-meter indication on strong signals (meter is 
good) and poor AGC action.  (May be part of the problem causing #1.)

3. LSB and USB work fairly well, but when switching to CW, a low level 
noise or motor boating like noise, occurs, (also could be AGC problems).

Don't think I know how to trouble shoot the AGC circuitry other than to 
check static voltages, etc.

If you have any experience on the above or can offer any suggestions, it 
would be appreciated.

73,
Ray, W4BYG
Naples, FL