[R-390] AGC Line Again

[Larry H]

Hi Ross,  Sorry, but I was not clear - I  need the readings when it's ok
and when it's bad.

Regards, Larry

On Wed, Feb 19, 2020 at 3:13 PM ROSS HOCHSTRASSER <bavarianradio at comcast.net>
wrote:

> Hi Larry,  The diode load voltage  is -40 volts DC and the voltage at the
> wiper of 523 is .089 volts. Yikes!! Thanks, 73 Ross
>
> On February 18, 2020 at 8:18 PM Larry H <larry41gm at gmail.com> wrote:
>
> Ross,  I've reread your posts and it sounds like the agc voltage decreases
> at the same time as the meter reading increases.  The only way I can see
> this happening is that the voltage at the cathode of V504 (and therefore
> the voltage at the top of R523 (carrier mtr adj))  is increasing to cause
> the meter reading to increase.  It doesn't take much change here.  The
> current draw of V504 is usually quite steady.   Can you check that and the
> diode load voltage, please?
>
> Regards, Larry
>
> On Mon, Feb 17, 2020 at 6:17 PM ROSS HOCHSTRASSER <
> bavarianradio at comcast.net> wrote:
>
> I am currently monitoring the AGC voltage at the jumper. With the radio
> cold, I was measuring -9.01 volts relative to ground.As the radio warmed up
> 15 minutes or so, the voltage has dropped to -5.06 volts, the signal is
> distorted and the s meter is pinned. The s meter started at 60db . It is
> tuned to WBZ which is about 15  miles from here.(very strong)  I am going
> to see if the AGC voltage drops any further. If it doesn't, I'll shut it
> off and check the resistance to ground with the jumper removed. Correct me
> if I'm wrong, but wouldn't the problem be on only one of the mech filters?
> I notice no change when switching between them.  Many Thanks to all of you
> for your help in beating this demon!!
>
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