[amsat-bb] Re: Foxdelta ST-2 / LVB Tracker

Joe Leikhim rhyolite at nettally.com
Sat Mar 2 14:22:16 PST 2013

Does the controller have motor protection logic/timers to detect if the 
motor is stalled?

This sounds like normal behavior I discovered with the TAPR TakBox. 
There is a timer that detects if the ADC disagrees with where the 
controller thinks the rotor should be pointed and stops the motor. It 
takes a number of seconds (in the timer) to reset the controller.

What I found was that the ADC always lagged where the controller thought 
the antenna should be pointed. The timer had to be long enough to allow 
the rotor to catch up.

"The trouble is, no matter what software I use, or even if I manually  issue
pointing commands via serial terminal, the ST2 will stop my rotator too
early, resulting in offpointing by about 20 degrees. I am  using the same
voltage divider that I used on my KCT, so the ST2 is  seeing a 0-5v reading
from the azimuth rotor POT. The LCD display  matches the analog display
within a degree, so the ST2 knows correctly  where the azimuth rotator is

Joe Leikhim

Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim at Leikhim.com



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