PP-5MD1 is the transmitter–receiver unit of the modernized RV-5MD1 radio altimeter system, designed for continuous measurement of true aircraft height above ground or water during flight.
It is the core functional element of the RV-5MD1 kit, generating, transmitting, receiving, and processing microwave signals to determine altitude and provide data to cockpit instrumentation and onboard systems.

The PP-5MD1 operates together with external antennas, a cockpit altitude indicator, cabling, and a shock-mount frame.
Functions performed in the system include:
• transmission of frequency-modulated probing pulses;
• reception and processing of reflected signals;
• computation of real altitude in real time;
• output of Danger Height alerts;
• generation of Failure/OK status outputs;
• built-in health monitoring and reference-height test.

A complete RV-5MD1 installation typically includes:
— PP-5MD1 transceiver,
— AR5-1 antennas,
— UV-5M altitude indicator,
— RA-5 shock-mount frame,
— interconnecting cables.

The system was used on Soviet/Russian helicopters and aircraft for safe low-altitude flight operations.

PP-5MD1, PP5MD1, RV-5MD1 transceiver, 5MD1 TxRx unit

Product Name: Radio Altimeter Transceiver
Designation: PP-5MD1
System Type: RV-5MD1 radio altimeter
Function: Microwave signal transmission, reception and processing
Altitude Range Capability: 0–300 / 0–750 / 0–1000 m (with matched indicator)
Operating Frequency: 4200–4400 MHz
Residual Height H₀: ~5.3 m
Accuracy 0–10 m: ±0.6 m
Accuracy above 10 m: ±0.6H
Danger Height Error: ±0.5 m at 5–10 m, ±(1+0.05H) above 10 m
Fault Outputs: Failure / OK indication
Danger Height Output: Available
Pulse Outputs: 10–700 m and 10–1000 m
Power Supply: 27 VDC + 115 V AC, 400 Hz
Installation: RA-5 shock-mount frame
Connected Equipment: UV-5M indicator, AR5-1 antennas, system cables
Application: Aircraft and helicopter low-altitude flight operations
Documentation: Passport and manual on request
Condition: As applicable

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.