[AMRadio] Muting the R390 on transmit


John King k5pgw at yahoo.com
Wed Dec 2 14:25:06 EST 2009


I have the R 390, Bob. Thanks. John, K5PGW



----- Original Message ----
From: rbethman <rbethman at comcast.net>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Wed, December 2, 2009 12:31:06 PM
Subject: Re: [AMRadio] Muting the R390 on transmit

The cited References are for the R-390A.

John, which is it you have?

*IF* it is the R-390A, then the break-in relay *IS* K-601 in the AF Module.

Bob - N0DGN

Grant Youngman wrote:
> On Dec 2, 2009, at 10:46 AM, John King wrote:
>
>  
>> Thanks for the source of information, Jerry. I have looked at the schematic on the Y2K site and see relay 601, the break in relay. Now I must physically locate it and determine if the relay is indeed bad. I have 12.95 vac at terminal 9 on the terminal board  on rear of R390. 
>>    
>
> Not sure of the age or condition of your 390, but you might also just try pulling and reseating P120/J620 on the audio chassis.  Among other stuff, this connector carries the operating voltage to the Break-in relay, K-602.  (K-601 is actually the squelch relay).  Both relays just ground the audio out from the AF amplifier V-601 through the interstage transformer T-601.
>
> Pins 1 and 2 of P120 carry the control voltage to the relay.  You could measure the voltage there also, to make sure it's getting that far along when pin 9 of the rear connector strip is grounded.
>
>
> Grant/NQ5T
>
>
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