[ARC5] muting

[Mike Everette]

You really don't need to switch between two volume controls.
 
Simply open the RF Gain pot ground on transmit, and add a fixed resistor between ground and the low end of the control.  Short this out on receive.
 
Using a pot to determine the value of the fixed resistor would make things easy.
 
73
 
Mike
WA4DLF

From: Bill Cromwell <wrcromwell at gmail.com>
To: arc5 at mailman.qth.net 
Sent: Friday, January 17, 2014 1:18 PM
Subject: Re: [ARC5] muting


On 01/17/2014 12:56 PM, John Saxon wrote:
> This is John, K5ENQ, in Pearland, TX.  I am putting together a T-22/R-23/MD-7 station.  I am "integrating" them into a more transceiver-appearing rig.  I was inspired by the Collins TCH that has a separate Tx & Rx, but put in one box.  I am doing my own control panel that includes extra relays.  I am doing the TR switching in  my own relays (I couldn't get the cosmetics I wanted using the BC-442-A relay).
>
> For muting I am doing the usual switch antenna and ground Rx antenna input.  For volume, I am switching the Rx sensitivity line between a Rx and a Tx sensitivity pot.  So I can have my Tx pot turned almost off and it switches to the normal Rx for receive.  I haven't tested this with the Tx working, as I have yet to complete the HV power supply for the T-22.
>
> I will also state that the T-22 & R-23 I was fortunate enough to get appear pristine and unmodified.  The MD-7 is also in very good shape.  When done here I can unplug/remove the units and use them cabled up as originally used.
>
> 73,
> John
> K5ENQ
>
Hi John,

What you are doing with the "TX sensitivity" pot should work perfectly 
in conjunction with the grounded receiver antenna terminal. I have used 
it before and will be using it again. I sorely miss full break-in QSK 
and I mean to get it back.

73,

Bill  KU8H
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