Al. The push pull switch is for calibration the full scale meter to your IR on
your specific cable run. You push it in call switch button and turn it to
adjust meter full scale
Wayne W3EA
Sent from my iPad
> On Nov 22, 2020, at 10:08 AM, 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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