[amsat-bb] satpc32 rotor question

Erich Eichmann erich.eichmann at t-online.de
Thu Oct 16 20:03:57 UTC 2014

Hi Keith,
I use also the Labjack U12 and the  Kenpro 5600B rotor combination 
(compatible with the G 5400).
The reason of the problem could be that the azimuth  "Out voltage" from 
the control box to the Labjack U12 is missing or too low or the azimuth 
calibration is wrong.

First make sure that  the azimuth "Out voltage" control on the rear side 
of the rotor control box is set to maximum output (+ 5...6 V at the 
rotor end position).

If that doesn't help display ServerLabjack normally. Click on 
"Calibration" to display the calibration window.  First click on "Help" 
for detailed instructions about how to proceed, then run the calibration 
function. Save the changes and restart SatPC32.

73s, Erich, DK1TB

Am 15.10.2014 21:50, schrieb Keith McDonnell:
> Hello to all. I just took my g5400b out of storage and decided to test it.
> The g5400 appears fine when not under computer control. Az/El motors work fine and the needles on the controller box correspond where the rotor is pointing.
> I ran satpc32 V.12.8b with the labjack u12 interface. I loaded all drivers for the labjack as well as serverlabjack. under computer control, the elevation works flawlessly but the az is out of wack. as soon as I hit the R+ button to initiate rotor control, the az will go completely to the clock wise end point and the labjack light remains on, power still going to the motor even at end stop. I even switched the turning point setting to north from south. This made the az do the opposite, completely CCW without shutting off.
> While I was playing with it, a satellite came in view. The g5400 started tacking the sat. At first it was right on target, but then the az kept moving CCW in small increments until it reached its end stop, still not shutting off power.
> I thought it might be a bad pot in the rotor, but I am receiving accurate readings on the controller. Position readings on the serverlabjack dde screen do not correspond with the actual pointing direction.
> Any help would be appreciated. Thanks and 73, Keith
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