[Johnson] Electronic TR Switches

[Carl]

I have a pair of those TR switches running at 1200-1500W on AM on one and 
SSB on the other with vintage gear. Never had any of the problems mentioned 
altho Ive always user a LPF with any TX/amp no matter how it is switched. 
There is a slight built in gain on RX that is not objectionable.

Carl
KM1H

----- Original Message ----- 
From: "David C. Hallam" <dhallam at knology.net>
To: "Johnson List" <johnson at mailman.qth.net>
Sent: Friday, July 25, 2014 8:34 AM
Subject: [Johnson] Electronic TR Switches


>I am revising the antenna feed line of my Invader 2000 to be able to switch 
>between low and high power as desired with a B&W two position coax switch. 
>I was thinking about replacing the Dow Key relay with a B&W 381-C 
>electronic switch.  After reading back through comments on various 
>reflectors concerning electronic TR switches, this might not a good idea. 
>Things like harmonic generation in the switch and increased receiver noise 
>floor are cited.  I do have a couple of low pass filters.  I get the 
>impression that unless you work full break-in CW (which I don't), it might 
>be a better idea to stick with the Dow Key relay.
>
> What might be comments on this.
>
> David
> KW4DH
>
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