Richard Clark wrote:
I've been doing it with a binary switched coax matcher for 15 years.
It occupies about half a cubic foot and tunes in increments of 1, 2,
4, 8, and 16 feet.

Are you using 50 ohm coax to try to match to 50 ohms
or just using it to vary the virtual impedance?
--
73, Cecil, w5dxp.com