I whoopsed. The resulting fundamental frequency I quoted should have
been in KHz or Kc back in those days. 38.1/72 = 0.5291666 Mc or
529.1666 Kc. and 23.2/54 = 0.4296296. In the first example, my
dyslexia got me so the numbers are wrong. Sorry.

Henry


Henry wrote:

If the crystals are the old WW2 crystals that are about an inch square,
the frequency is determined as follows:

If the Channel is a 2 digit number, divide the marked frequency by 54 to
obtain the fundamental frequency:

Channel 32
Marked Frequency 32.2 Mc
Fundamental Frequency 32.2/54 = 429.630 MHz

If the Channel is a 3 digit number, divide the marked frequency by 72 to
obtain the fundamental frequency:

Chhannel 381
Marked Frequency 38.1 Mc
Fundamental Frequency 38.1/72 = 529.166 MHz

Hope this helps and 73,

Henry WA0GOZ