[ARC5] muting

[Bill Cromwell]

On 01/17/2014 11:55 AM, David Stinson wrote:
> ---snip------
> If you don't want to use a relay, one of our "smart people" can
> design a simple transistor circuit that will mute the receiver audio
> on key-down.
>
> ------snip---
> 73 DE Dave AB5S
>
Hi Dave,

I have looked at several possible (reversible) mods for the receivers 
and decided the way to approach what I want to do is install some of 
those newfangled transistor gizmos "under the hood". Rather than mute 
the receiver I prefer to reduce the gain so that I can use the 
transmitted signal in place of the CW sidetone. Just shorting the RX 
antenna input leaves far too much signal into the speaker or cans - but 
yes - the receiver can 'take it'. I have some completely solid state 
receivers and they can "take it" too. It's not pleasant to listen.

Adding some transistors and glue inside the radios is the most easily 
reversible modification (just yank it out). The radio immediately 
reverts back to original.

73,

Bill  KU8H