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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