More on half power HW-101

[Mark S Graalman]

Greg,

  Can you monitor the drive level at various
points with a scope, or RF probe and see if
the drive level is changing at the mixer, driver
grid/plate or final grid? Are the voltages at
the mixer, driver, final screens or plates
stable? Do the controls peak at a different
point once the rig is warmed up? If so you
may be looking at a fixed value padder cap
changing value with temperature.

Mark  WB8JKR


On Thu, 14 Dec 2000 18:14:12 -0500 Greg Hockenjos <nunu726 at LYCOS.COM>
writes:
> Hello. No progress yet. When I turn on the radio from a cold start,
> the radio being off for hours, and put the radio in tune I try to
> tune the rig on a dummy load and resonant antenna and get only half
> power output. If I tune and tune for 10 minutes the radio will
> gradually get to full output. I put in new finals, new driver,
> peaked all coils under the radio and changed the 4 carrier diodes
> twice. Still nothing has helped. The 4 diodes I put in are general
> purpose germanium 1n34A's. Still looking for the problem. Any ideas?
> Greg.
>
>

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