Henry Kolesnik wrote:

This is in an old military radio which I suspect is not 3.2 ohms but
somewhat higher like maybe 600. It's kind of hard to get to the
primary. I guess I should have stated that at the beginning. I kind of
recall some way of measuring the open circuit voltage from a tone and
then with a pot connected across the output, set the pot to where the
voltage is 1/2 and then measure the pot. Do I have that correct?


That is how we measured the input impedance on the PRC77 The input
was fed a 1 kHz tone, and a series resistance was added, till the
modulation dropped to half.

If it is an old military radio it is likely 600 ohms. What is the
brand and model, or the military ID number?

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