The PP-5M is the primary transmitter–receiver unit of the RV-5M radio altimeter set.
It generates, transmits, receives and processes microwave signals to determine true aircraft altitude above ground or water during low-altitude flight.

Functions performed by the PP-5M include:
• transmission of probing signal to the external antenna;
• reception and processing of reflected energy;
• extraction of height information for cockpit indication;
• generation of Danger Height warning outputs;
• Failure/OK signaling to crew systems;
• built-in health monitoring with reference-height control.

The transceiver mounts on the RA-5 shock-mount frame and connects to two AR5-1 antennas, cockpit indicator and aircraft cabling.
It is the core functional element of the RV-5M altimeter and can be replaced independently in service.

PP-5M, PP5M, RB-5M TxRx unit, transceiver 5M

Product Name: Radio Altimeter Transceiver
Designation: PP-5M
Product Type: Microwave transmitter–receiver block
Role: Signal generation, reception and processing
Altitude Measurement Range: 0–300 / 0–750 / 0–1000 m
Residual Height H₀: 5.3 m
Accuracy 0–10 m: ±0.6 m
Accuracy above 10 m: ±0.6H
Indicator Error: ±0.08H
Danger Height Error 5–10 m: ±0.5 m
Danger Height Error above 10 m: ±(1 + 0.05H) m
Sensitivity (K-5 path): ≥87 dB
Calibration Error: ±0.3H (automatic)
Control Indication Value: 15 ±1.5 m
Pulse Output “1 PC”: 10–700 m
Pulse Output “2 PC”: 10–1000 m
Failure/OK Output: 27 ±2 V
Power Supply: 27 VDC + 115 V 400 Hz (through aircraft wiring)
Operating Frequency: 4200–4400 MHz
Warm-Up: Automatic
Continuous Operation: Up to 6 hours
Mass: ~6.9 ±0.3 kg (with mounting)
Mounting: RA-5 shock-isolated frame
Connected Equipment: AR5-1 antennas (2), A-034-4-24 indicator, GU4.850.668-29 / GU4.850-759 cables
Documentation: Passport and manual available
Condition: As applicable

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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.