[AMRadio] Muting the R390 on transmit


rbethman rbethman at comcast.net
Wed Dec 2 12:22:47 EST 2009


Correction - K-601!

Fat fingers and brain still digesting caffeine!

Bob - N0DGN

rbethman wrote:
> John,
>
> Y-601 "should" be in the AF deck.  That is the 6XX component area.
>
> Bob - N0DGN
>
> 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. Now to locate the relay and determine if a component between the power source and the relay coil is bad. I suspect a resistor that may be in series with the relay coil voltage supply  "in my imagination" because I haven't located such a resistor. I remember a faint smell of hot carbon when I first attempted to energize the relay by grounding terminal 9 and additionally, I observed slight arcing when I connected the grounded alligator clip to terminal 9.  If the foregoing tells you anything, please feel free to direct me. Thanks again and 73, John, K5PGW
>>
>>
>>
>> John King wrote:
>>   
>>     
>>> Thanks for the reply, Grant. My R 390 doesn't mute when terminal 9 is grounded. I have connected an alligator clip lead to terminal 9 and then connected the other end of the clip lead to terminal 16 which is ground and there is no effect. I can't figure out why there is no effect when terminal 9 is grounded. What do you think, Grant? I do not have a manual or schematic for the R390. 73, John, K5PGW
>>>
>>>
>>>  
>>>       
>>       
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