Antenna control and monitoring

Antenna control and monitoring
Feature	Description
Servos	AZ and EL (independent) Digital position and velocity servos.
Tachometer	Analog TACH Virtual Tach from differentiated angle input.
Velocity servo accuracy	0.5 % at 3 RPM typical
Position Accuracy	0.1° typical
Fail safe checks	Limit switch diode clamping Limit switch shutdown Out-of-bound elevation request limiting Out-of-bound elevation Out-of-bound antenna speed Soft limiting Tach and angle changes inconsistent Unresponsive antenna “Dead” host computer

Antenna and Antenna Control I/O
Feature	Description
Approach	Digital position and velocity servos with interactive software parameter tuning.
AZ/EL position input	TTL 16-bit binary angle, 14-bit BCD or 90 V 60 Hz synchro (nominal).
AZ/EL position output	TTL 16-bit binary angle.
AZ/EL tachometer input (if available)	±70 V signed analog input voltage.
Servo drive error	±10 V analog output to AZ/EL servo amplifiers
Servo control and status	On/Off control using TTL or switch closure output. On/Off status via wide range input.
Antenna	Local mode switch input, switch closure or TTL.
Alternate control relay signal	12 V output to external relays to switch to alternate control such as handwheels when the antenna is in local mode or shutdown state.