[AMRadio] Muting the R390 on transmit

John King k5pgw at yahoo.com
Tue Dec 1 22:49:06 EST 2009

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

----- Original Message ----
From: Grant Youngman <nq5t at tx.rr.com>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Tue, December 1, 2009 9:19:05 PM
Subject: Re: [AMRadio] Muting the R390 on transmit

It's terminal 9 (first terminal on the left) of the rightmost terminal block (looking from the rear of the radio), marked BRK IN.

Ground this terminal to mute the receiver when the "Break In" switch is set to ON.


On Dec 1, 2009, at 8:51 PM, Brett Gazdzinski wrote:

> Its been a while since I had mine, but think there were terminals on the 
> back marked 'mute'.

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