[Johnson] Johnson T-R Switch Receiver muting

[James M. Walker]

Well,
I use the Johnson Pacemaker, Thunderbolt combo, with
an SX-101A receiver! The antenna connection comes in through
a Johnson KW Matchbox. Antenna is single wire feed to a 100 ft.
Flat-Top antenna, works on 80 -10 meters very well, with little
or NO SWR reading at the matchbox.

The RG-8 coax from the Matchbox to the Thunderbolt is
a single length. The cable from the Pacemaker is a three (3)
foot length, and goes to the "T-Bolt input connector. The
Coax from the TR-Switch to the SX-101A is Belden RG-58(A/U).

That system doesn't get feedback on AM, as I control the audio
gain manually. The system as a whole seems to work as described
in the various equipment manuals.
FWIW

Jim
WB2FCN/WD2XSH-22
http://eshop1.chem.buffalo.edu/


----- Original Message ----- 
From: "Harry Vaught, KT4AE" <kt4ae at bellsouth.net>
To: <johnson at mailman.qth.net>
Sent: Thursday, May 10, 2012 9:23 AM
Subject: [Johnson] Johnson T-R Switch Receiver muting


> Has anyone conquered the receiver muting problem with the Johnson T-R 
> switch?  It was to be used in my Ranger/SX-100 station.
> 
> I installed the mod from the March, 2011 ER which provides a reed relay 
> for receiver muting when transmitting.  Also, the switch grounds the 
> receiver antenna connection when in transmit.
> 
> What is needed is to disconnect the receiver antenna when transmitting. 
>  I have always done this with relay based switches I've built.  All the 
> muting relay does is to turn off external signals.  The "sidetone" from 
> the switch is still way too powerful. The front end is still overloaded, 
> AVC or not, and takes a couple of seconds to recover.
> 
> Has anyone found a way to provide useful silencing of the receiver in 
> transmit using the Johnson switch?  These switches are very popular.  If 
> there's no solution to the muting problem, how do people live with it?
> 
> Regards,
> 
> Harry, KT4AE
> Watkinsville, Georgia
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