[Johnson] Johnson T-R Switch Receiver muting

[Carl]

In the old days the operator was not too lazy to use the Send-Receive switch 
on the receivers front panel. Now they need to be spoon fed.

The TR switch is simply replacing the noisy and erratic Dow Key or similar 
relay which, if I remember correctly, did not have the optional external 
contacts when first available.

Carl
KM1H


----- Original Message ----- 
From: "Kenneth Goodwin" <krgoodwin at comcast.net>
To: <johnson at mailman.qth.net>
Sent: Thursday, May 10, 2012 1:15 PM
Subject: Re: [Johnson] Johnson T-R Switch Receiver muting


> The Johnson T-R switch was never designed for any sort of muting 
> capability;
> strictly to keep direct RF from being applied to the front end of the
> receiver hooked up to the same antenna as the transmitter.  Front-end
> overload was a byproduct of the scheme.  Those of us who used it put up 
> with
> the received signal with our AVC turned off and probably have suffered a
> loss of hearing as if we had been listening to rock n roll for all those 
> QSK
> years (which I guess in reality we were - so two strikes).
>
>
>
> Johnson did have a Signal Sentry (CW/Phone Monitor) that was designed do
> nothing but mute.  However, it injected a side tone whereas most of us 
> true
> QSK aficionados like to know exactly where our signal was wrt the other
> station.  Ken K5RG
>
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