[Johnson] Ranger Question

[Roy Morgan]

On Apr 17, 2009, at 9:57 PM, Roy Morgan wrote:

>
> On Apr 17, 2009, at 11:33 AM, Michael Hardie wrote:
>
>> ... There are two "oddities", the drive control is about
>> 1.5 on it's dial and the grid current reads 0.4 ma when the plate
>> current
>> reads 140 ma, the manual states that the grid current should be
>> around 2.5
>> ma.
>
> The final may be oscillating.  Check with a scope on the output

I just got this report from a fellow with a Collins S-line  
transmitter, and the cause of his problem may be the answer to the  
Ranger problem, too.

CHECK ALL GROUND POINTS!

______
Hi Roy

I'm the guy that posted a 32S1 question about how grid current could  
be achieved at the finals when the finals were disabled.  You  
mentioned using a AC/DC scope to trouble shoot etc.

Well, I found my problem.  The old bug-a-boo, Aluminum chassis  
oxidation!  A ground point on a terminal strip that needed  
tightening.  A twist of a screwdriver and the rig is doing what it  
should.  All I need to do is touch up the alignment and I should be  
done (I hope!).

Thanks for the help.

Regards
Gordon Pawelchak, VE7OW
_______

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073