The AN/APN-130 is a CW Doppler navigation set designed primarily as an all weather ground velocity indicator for helicopters, airships, and other aircraft with hovering or negative speed characteristics.  The set automatically and continuously measures and displays heading speed, drift speed, and vertical speed without the aid of ground stations, wind estimates, or true airspeed data. Outputs are provided for tie-in with helicopter automatic stabilization equipment,  ground position computing and indicating equipment, and distance computing and indicating equipment.

SPECIFICATIONS

Manufacturer: Ryan Electronics,  a Division of Ryan Aeronautical Company
Circa 1961.
Heading Speed: 0 to +150 knots
Drift Speed: 0 to 150 knots
Ground Speed: 0 to  150 knots
Drift Angle: Any
Vertical Speed: 0 to 3,500 ft per min.
Altitude Range: 0 to 10,000 ft
Type of System: CW Doppler; four fixed beams
Transmitter Frequency: 13,300 MHz
Transmitter Power: 5 watts
Antenna Beam Width: 3 degrees
Power Consumption: 500w
Power Requirements: 115/220v, 120 or 400 Hz,  1-phase
Navigational Accuracy: Error of less than 2% at altitudes up to 10,000 ft

AN/APN-130 principal components (Image courtesy T-pub.com)

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Credits and References:

1) http://www.tpub.com/content/radar/TM-11-487C-1/TM-11-487C-10783.htm
 

June 27/10