Agilent / Keysight 85370A Antenna Positioner Encoder

The Agilent/Keysight 85370A Antenna Positioner Encoder interfaces with antenna positioning systems to decode synchro signals and provide precise angular position feedback to compatible microwave receivers. This encoder enables accurate, repeatable antenna alignment and manual pattern measurement without replacing legacy positioning hardware. It bridges existing manual antenna ranges with modern test equipment, allowing parameter selection and boresighting control directly from the receiver front panel.

Technical Specifications

• Signal Interface: Monitors and decodes synchro lines from antenna positioner; transmits positioning data via encoder interface cable


• Angular Display: Continuous real-time display of corrected positioner angle


• Directional Control: Synchro direction reversal switch to determine clockwise or counterclockwise rotation sense


• Measurement Parameters: Start angle, stop angle, and angular sampling increment selection from receiver front panel


• Boresighting: Positioner offset angle entry capability from receiver


• Physical Dimensions: 12 × 10 × 8 inches


• Weight: 10 lbs

Key Features

• Synchro signal decoding and conversion to receiver-compatible format


• Real-time angular position correction and display


• Directional sense verification via front-panel switch


• Manual antenna pattern measurement capability


• Boresighting support with offset angle compensation

Typical Applications

• Antenna characterization and pattern measurement on manual ranges


• Integration of legacy positioners with modern microwave receivers


• Repeatable antenna alignment and testing workflows


• Angular sampling control for antenna radiation pattern analysis

Compatibility & Integration Designed for use with the Agilent/Keysight 8530A microwave receiver and virtually any antenna positioning system employing synchro feedback. This product is legacy and no longer manufactured or supported by Keysight. Operating and service manuals may be available from third-party sources, though completeness and currency are not guaranteed. Limited calibration support may be available through authorized service centers.