[AMRadio] National PW Dial

[Sara & Wayne Steiner]

I found that the variables in the  command set series of transmitters are
very close to straight line frequency.  Some years ago I built a variable
osc. using one of those caps and a mechcanical digital  counter and was in
within  less than .5 khz over a 200khz band (160m). I of course had to do
some trial and error plate bending.
Over a 25 khz portion of the band and a small variable osc padder I could be
"spot on".

wayne , N0TE