[AMRadio] Muting the R390 on transmit


rbethman rbethman at comcast.net
Wed Dec 2 14:37:15 EST 2009


Okay John.

The info from Grant is then correct!

Bob - N0DGN

John King wrote:
> 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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>   

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