[AMRadio] Muting the R390 on transmit

[rbethman]

John,

The manuals are on EDEBRIS.

<http://bama.edebris.com/manuals/military/r390/>

Bob - N0DGN

John King wrote:
> Thanks Larry. I have switched the break in to "ON" and had no mute. I have 12.95 vac at terminal 9 on the terminal board on the rear of the rcvr with the break in switch on and 1.68 vac at terminal 9 when the switch is off. 73, John, K5PGW
>
>
>
> ----- Original Message ----
> From: Larry Szendrei <ne1s at securespeed.us>
> To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
> Sent: Wed, December 2, 2009 1:43:22 PM
> Subject: Re: [AMRadio] Muting the R390 on transmit
>
>
>   
>> 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
>>
>>     
>
> You didn't mention whether the Break In switch was "on", which, as Grant
> said, must be for it (=grounding the break-in terminal) to mute the
> receiver. Or, maybe there is a problem in that circuit in your R390. I
> used this function on my R390/URR, and it worked exactly as Grant
> described.
>
> 73/GL,
> -Larry/NE1S
>
>   

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