[Milsurplus] Command tx bits wanted

[David Stinson]

Ben Nock wrote:
> ... I have ever had any of my rollers in line, regardless of freq
> as they seem to match into
> 50 ohm when at the end of its travel.

Actually, this is not a good match.
It will couple significant harmonic energy to the antenna and
load only to about 60% power out.  The tight coupling will also
pull the oscillator with any antenna "sway."

A proper match can be had with a 4:1 UNUN transformer,
or simply put an NPO 50 PF cap at 1.5 KV or better in series
with the roller.  It will give best power out about 1/3rd of
the way down the coil, be much cleaner and less "chirpy."