Calibration. Push the button/knob, turn button/knob to full scale, push
again to go back to operate mode, then don't touch it again.
On Sun, Nov 22, 2020, 09:08 Al Kozakiewicz <akozak@hourglass.com> wrote:
> I've had a "new" (never used) HAM IV and controller I bought on eBay a
> decade ago. Recently put up a short tower with a C3, 6M and 2M yagis and
> decided to use it. The back of the controller says Telex/HyGain, so I
> assume it is fairly old.
>
> Worked on the bench. Worked outside after I got the tower and antennas
> assembled. Brought it inside, did the final wiring and the position meter
> was stuck at full scale. Shorting the rotor pot legs to ground did not
> change the meter position.
>
> Long story short, I took it apart and brought it to the workshop to
> diagnose, figuring it is something simple (there is nothing to the meter
> circuit). Poking around, I notice there is a switch on the calibrate pot
> that is activated by push/pull and is not mentioned in the manual I have or
> shown on the schematic. I had apparently pushed it while wiring the back
> panel. Pulling it out restored the operation of the meter circuit.
>
> What the heck is it for?
>
> Al
> AB2ZY
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