[Collins] Need Advice - KWM 2A Transmitter Problems

[John Page]

There are many things that could cause this. But the easiest and cheapest to 
do first is to CLEAN the bandswitch. Might as well clean the rest of them 
while you are in there. Now try it and tell us how it did. John



John Page K4KWM
Hollow State since 1953
(ex W8PKU,N8BLB,NA8O)





>From: pjdobosz@juno.com
>To: collins@mailman.qth.net
>Subject: [Collins] Need Advice - KWM 2A Transmitter Problems
>Date: Thu, 10 Jul 2003 21:16:30 -0500
>
>I recently purchased a WE KWM 2A (circa 1968) that appears to have
>transmitter
>problems on some bands.  It appears to be working somewhat on 75 and 40
>meters but the other bands won't load up at all.  It makes no difference
>if I tune
>it up into a Laboratory 50 Ohm dummy load or into an antenna, the
>behavior is
>the same.
>
>Here are my observations:
>
>75 & 40 Meters
>
>Tunes up and loads OK with slightly lower plate current and RF output
>than the
>book values in the manual.  RX seems to be OK.
>
>20 Meters
>
>No grid current indication in tune position.  RX noise peaks but no plate
>current
>thus unable to dip plate or measure any RF output.
>
>15 Meters
>
>Grid current & exciter peak very touchy.  Was finally able to get tuned
>similar to
>75 & 40 Meter behavior.
>
>10 Meters
>
>Same characteristics as 20 Meters unable to get it to load up
>
>Prehaps those of  you with specific Collins experience, especially
>"hollow state"
>knowledge of this rig can give me some ideas of where and what to look at
>to
>get this repaired.  I'd also appreciate any insight into who might
>specialize in
>KWM 2A repair & alignment.  I'll be anxiously awaiting your replies .....
>
>Paul - K8PD
>Noblesville, IN
>
>
>
>Sponsored by the Collins Radio Association
>http://www.collinsra.com

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