[AMRadio] Muting the R390 on transmit


rbethman rbethman at comcast.net
Wed Dec 2 13:31:06 EST 2009


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
>
>
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>   

-- 
+------------------------------------------------------------------+
|               AM Amateur Radio Operator    NØDGN                 |   
+------------------------------------------------------------------+
|               http://home.comcast.net/~rbethman/                 |
+------------------------------------------------------------------+
| Bob Bethman                \\\|///     " The absence of a danger |
|                           \\ ~ ~ //      signal does *NOT* mean  |
| rbethman at comcast.net      (/ @ @ /)      that everything is OK " |
+----------------------o00o---°(_)°---o00o-------------------------+



More information about the AMRadio mailing list

This page last updated 16 Oct 2017.