[Boatanchors] Electronic TR Switch?

[Vic Rosenthal]

mikea wrote:

> But it's an _active_ device, with a vacuum tube in it, and if the grid is
> driven positive, then it's no longer linear: it stops acting like a piece
> of copper. Instead, it changes those pretty sine waves to something non-
> sinusoidal, with all those rich, chunky second and third harmonics that the
> local TV-watchers have come to know and love.
> 
> That's all it takes, and some (not all, but *SOME*) of the tube-type TR 
> switches are known for exactly this behavior, as the original note stated:

And the solution, then and now, is a lowpass filter between the tr switch and 
the antenna.  The mechanism that generates harmonics here is exactly the same as 
the one in a class-C amplifier.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco