[amsat-bb] Re: G5400B calibration problems

Lizeth Norman normanlizeth at gmail.com
Sat Jan 25 23:14:38 PST 2014

A few possibilities exist.
1. The rotator is mechanically hosed. This includes the pot mounting an
gears and stuff inside that drive the pot.
IIRC the 5400b has no mechanical stops and relies on fuses to protect the
windings of the motors.
You can check this by moving the rotator and looking at the wiper arm of
the pot with regards to ground. Again IIRC the pot value is 450 Ohms.

2. The pot is just really dirty and needs some exercise.
I've got a good rotator with a bad control box here..
Norm n3ykf

On Sun, Jan 26, 2014 at 1:44 AM, Tim Goodrich <tim at timgoodrich.com> wrote:

> Hello All,
> I could use some help with the alignment/calibrating of my az/el rotor to
> my
> rotor controller.
> I followed the G5400B manual instructions and set the rotor and antennas to
> the full south position. The meter indicated full stop at the south
> position
> as well. I then depressed the azimuth control to bring the rotor around 360
> degrees back to south. The first 5-10 seconds, the antennas moved and the
> meter needle was not moving. However, when the rotation was complete,
> although the antennas were pointed south, the meter stopped just a couple
> degrees away from south, so I used the rear pot adjustment to zero it.
> I then swung the other way attempting to go back to my starting position.
> After the meter hit full stop at south in the original position, I looked
> at
> the antennas and they were about 45 degrees short of full south.
> According to the manual, I followed the steps correctly, but no matter what
> I do, I cannot get the meter to always accurately reflect where the
> antennas
> are actually pointing.
> Can anyone tell me what might be wrong?
> Thank you,
> Tim
> K6TW
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