P-736

Large base VHF direction finder P-736, Rohde & Schwarz PA 025; manufactured by Rohde & Schwarz, Munich.

The VHF/UHF - Doppler direction finding system Rohde & Schwarz PA 025 was initially acquired by the Army in 1982, in 2002 the systems were handed over to the Air Force and operated from them as remote-controlled systems in their mountain locations in addition to the P-728, until their definitive decommissioning in 2010.

P-736. configuration with ESM2 receiver as used by EKF Heer.

Technical data

Principle: UHF Doppler direction finder Rohde & Schwarz PA 025
Receiver Rohde & Schwarz ESM 2: Double conversion, IF 199.3 or 339.3 MHz; 10.7 MHz
from 2002 converted to
- Receiver Rohde & Schwarz ESM 500: Double conversion, IF xxx / 1.650 MHz
Operation modes: A1 with BFO, AM (A3), SSB (A3JU/O, ISB, F3 (FM)
Frequency range: 20 - 500 MHz, optionally up to 1000 MHz; digital display, 10 Hz
Sensitivity: AM (A3) / Selectivity:

Power supply

Mains operation: 220 V AC mains supply

Dimensions

Accessories

Direction finder adaptor PP 025
AP 225V and AP 225U DF antennas

Equipment

The PA 025 VHF/UHF Doppler direction finder was developed by Rohde & Schwarz around 1980 and it was acquired in its original configuration with the ESM2 VHF/UHF receiver for EKF Trp in a number of eleven units in 1982, where they were used as mobile direction finders for signal monitoring.

After 2002, the systems were handed over to the Air Force for further use and remained in use as remote-controlled receivers at mountain sites until 2010.

The system was converted to the VHF/UHF receiver ESM 500 (E-664), the receiver has four IF bandwidths, 99 memory locations and an automatic memory search.

The bearing is displayed on the PP 025 direction finder; the north direction can be calibrated on the direction finder. The AF/DF button is used to switch to direction finding mode; in direction finding mode, the audio signal is superimposed by a whistling tone.

P-736: configuration with ESM500 receiver as used by EKF Luftwaffe.

The 6-element VHF U-Adcock antenna AP 225V in the 20 - 180 MHz range and the six-element U-Adcock antenna AP 225U on the same mast for the 180 - 1000 MHz range were used as DF antennas.