[Drake] TR3 Issue

[Robert Wood]

Chris,

Plan to work on it again this weekend.  Sorry for the lack of symptoms, I just
thought I would throw it out there to see if there was an easy fix to get it up
and running.  Appreciate your info.

Thanks,

Robert
WB5MWL

-----Original Message-----
From: drake-bounces at mailman.qth.net [mailto:drake-bounces at mailman.qth.net] On
Behalf Of Chris Codella, W2PA
Sent: Wednesday, April 11, 2007 7:40 PM
To: drake at mailman.qth.net
Subject: Re: [Drake] TR3 Issue

Robert,

We might need a few more symptoms to diagnose this.

If the S-meter goes all the way right after warmup, it sounds to me like
the receiver is muted because the RF gain is turned all the way down.
Even in transmit, the meter shouldn't do that (it doesn't do that on my
TR-4 anyway).  I'd start by poking around the AGC line.  The voltage
should change smoothly as the RF gain is varied.

73,
Chris, W2PA

Robert Wood wrote:
> I do not receive any signal switching between all bands and modes (I have an
> open 1/4 plug in the CW plug).  All of the voltages from my AC4 are good, and
I
> validated the regulated 150 voltage is good.  I tested also tested all of the
> tubes on a tube tester and they all indicate good.  I can get the speaker to
hum
> by touching volt/ohm meter on audio pot, and the carrier detect pot, but that
is
> as far as I have gone.  Another interesting symptom is the S meter goes all
the
> way to the right after the radio warms up.

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