[R-390] Carrier Level Meter Issues

[David Wise]

Barring the miraculous outlier, every R-390 and R-390A that has not had C551 replaced, needs it.  They go leaky which strongly affects AGC behavior.  You can put the new one in the IF deck, either in the old one's can or underneath, or you can mount it behind the front panel as part of my mod, "Ending the Moment of Silence".

It's also a good idea to either replace C553, or insert a current limiter which is easily made from a cheap abundant LND150 depletion-mode FET.

Dave Wise
SWL in Hillsboro Oregon (inactive)

From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of Jacques Fortin
Sent: Wednesday, March 02, 2022 11:16 AM
To: gary.biasini at shaw.ca; hamfish at comcast.net; R-390 at mailman.qth.net
Subject: Re: [R-390] Carrier Level Meter Issues
Importance: High

Gary, does it make a difference when you try the AGC in Slow / Medium / Fast
??
When listening to a very strong local BCB station, what did you measure as
the AGC line voltage (TB102 3+4) ???

73, Jacques, VE2JFE in Montreal

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net<mailto:r-390-bounces at mailman.qth.net> <r-390-bounces at mailman.qth.net<mailto:r-390-bounces at mailman.qth.net>> De la
part de gary.biasini at shaw.ca<mailto:gary.biasini at shaw.ca>
Envoyé : 2 mars 2022 13:18
À : hamfish at comcast.net<mailto:hamfish at comcast.net>; R-390 at mailman.qth.net<mailto:R-390 at mailman.qth.net>
Objet : Re: [R-390] Carrier Level Meter Issues

Craig,

I missed your message until just now. It is in the AGC position.

Thanks for your message.

-----Original Message-----
From: hamfish at comcast.net<mailto:hamfish at comcast.net> <hamfish at comcast.net<mailto:hamfish at comcast.net>>
Sent: February 27, 2022 10:16 AM
To: gary.biasini at shaw.ca<mailto:gary.biasini at shaw.ca>; R-390 at mailman.qth.net<mailto:R-390 at mailman.qth.net>
Subject: RE: [R-390] Carrier Level Meter Issues

Hello Gary,

Is the function switch in MGC or AGC??

Regards,
Craig

-----Original Message-----
From: r-390-bounces at mailman.qth.net<mailto:r-390-bounces at mailman.qth.net> <r-390-bounces at mailman.qth.net<mailto:r-390-bounces at mailman.qth.net>> On
Behalf Of gary.biasini at shaw.ca<mailto:gary.biasini at shaw.ca>
Sent: Sunday, February 27, 2022 9:00 AM
To: R-390 at mailman.qth.net<mailto:R-390 at mailman.qth.net>
Subject: [R-390] Carrier Level Meter Issues

On my 1967 EAC S/N 4996, I have zeroed the meter as follows:



I tuned the radio to a dead space, unhooked the antenna and turned the RF
gain fully counter-clockwise. I then adjusted R523 to zero the meter.



However, when I tune to 2 different local (strong) AM stations on the BCB,
even though I start to hear the audio when the RF gain is at 4.5 and it is
heard very loudly at 7, the carrier level meter only starts to register when
the RF gain is at 7.5 and at full clockwise, only registers 40 db.



I would like to troubleshoot this but don't know where to start. If anyone
could guide me as to what to check, I would be most grateful.



Thank you.



Gary

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