EA4TX – ARS-USB Manual – June. 2024 Page 14
Example for Azimuth rotors referenced to Ground:
Positive Potentiometer Feedback ──────► J4-5
Negative Potentiometer Feedback ─────► J4-4
If the Negative is referenced to Ground, connect J4-4 to J4-3.
Once connected, there is a Pot that can be adjusted for correct input to the ARS-USB
ADC input:
Azimuth Input Adjustment:
POT1: will adjust the Gain of the Amplifier. CCW movement will attenuate the
input voltage while CW movement will increase the input voltage. You can
additionally use the ARSCONF software calibration procedure to read the
maximum ADC value. While doing this, use a screwdriver to adjust POT1. Of
course you can place a voltmeter at point X2-1, and adjust the POT1 in the
same manner until the voltmeter displays 5V. This adjustment must be done
when the rotor is placed at the CW (Right limit).
Elevation Input Adjustment:
POT2: The procedure to calibrate the Elevation Gain at POT2 is the same as
the Azimuth calibration with POT1.
Note: ARSConf program is installed with the ARSVCOM installer
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