[R-390] 51J AGC and PTO questions

Sun, 24 Mar 2002 10:32:45 -0700

Tom
Dallas Langford wrote a series of articles for the Hollow State News letter
dealing with changes to the AGC  circuit in the 51J-4. You may want to look
at those. If you can't find a copy let me know.
Kurt Holbrook

----- Original Message -----
From: "Tom M." <[email protected]>
To: <[email protected]>
Sent: Sunday, March 24, 2002 9:49 AM
Subject: [R-390] 51J AGC and PTO questions

> Anyone ever slowed down the AGC action on your 51J?  Mine is really fast
and it
> has an annoying pumping action to it (don't know if it has any mods).
>
> What cap on the AGC would be right to slow this thing down for SW
broadcast
> use?  390A uses 2 uF for MED.
>
> Also, did anyone notice that the PTO endpoint error varies with line
voltage on
> the 51J?
>
> I set mine spot on about 5 years ago.  It is now 4 kcs long on 120VAC and
2 kcs
> long on 108 VAC (using a 12V bucking transformer box).
>
> This PTO moves faster than kudzoo weed, but I guess one could use a variac
to a
> limited degree to tame the PTO endpoint until such time you could dive in
> again.
>
> Thoughts?
>
> 73 Tom N5OFF
>
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