[Johnson] Start of New Year

[David C. Hallam]

Bill,

I don't think the problem is associated with the coax feed line.  I use 
a Dow Key coax relay for change over.  Both the receiver and the station 
monitor are functioning normally in the receive mode.  I will go over 
the coax from the relay to the antenna switch again just to make sure. 
That, of course, was my first thought.  I had made some changes in the 
operating position and moved a few things around.

Zsac is simply the zero signal anode current.

73
David
KW4DH

On 1/1/2015 10:38 AM, Bill Cromwell wrote:
> Hi David,
>
> I don't know what 'zsac' is but the first thing I would be looking for
> (if I understand correctly what you are saying) is defective coax
> jumper cable somewhere outside of the transmitter. I have had that
> happen in my station a couple of times. It's the easiest part to
> check. Good luck with repair project.
>
> Happy New Year
>
> 73,
>
> Bill  KU8H
>
>
> On 01/01/2015 10:24 AM, David C. Hallam wrote:
>>
>>
>> Yes the grid current does vary when I increase the drive.  In the CW
>> position  I get about 600 mA of plate current.  With the PA tuning I
>> can dip to to about 40 mA with no indication of output on my monitor
>> scope.  All of this leads me to believe the problem lies in the PA
>> tuning/loading circuit.  In the SSB position the zsac does not change
>> from about 220 mA when I apply audio drive from the exciter.
>>
>> David
>> KW4DH
>>
>
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-- 
There are two possible outcomes: if the result confirms the hypothesis, 
then you've made a measurement.
If the result is contrary to the hypothesis, then you've made a discovery.
Enrico Fermi