E-652, VHF / UHF receiving equipment Rohde & Schwarz ET-001 with the receiver ESM-2; developed and produced by Rohde & Schwarz, Munich.

The VHF / UHF receiving system ET-001 from Rohde & Schwarz was not only part of the P-728 VHF direction finding system, but also used separately as a monitoring receiver with army designation E-652.

• Principle: Double conversion; IF 199,3 or 339,3 MHz; 10,7 MHz
• Modes: A1, AM (A3), FM (F3)
• Frequency range: 25 - 1000 MHz
• Analog dial, optional digital frequency controller EZK: digital display 1 kHz
• Sensitivity: AM (A3) 1 - 2 μV / Selectivity -3 dB: 15, 30, 250 kHz; 1 MHz

• Mains: 220 V AC

• 560 x 358 x 216 mm; 28 kg

• Frequency controller EZK: digital frequency display 1 kHz
• Panoramic display EZP

The VHF / UHF receiver system Rohde & Schwarz ET001 carried the Swiss Army designation E-652 when used as monitoring receiver.

The VHF-UHF receiver ESM2 covers 25 - 1000 MHz in nine band segments, it has an analog dial with a conventional tuning knob, reception modes AM, FM and PULS are selectable. The IF bandwidths are 15, 30, 250 kHz and 1 MHz, the receiver has several AGC and MGC options.

The frequency can also be controlled with the frequency controller EZK with an up / down tuning switch featuring different tuning speeds; the digital frequency display with a resolution of 1 kHz is part of the frequency controller. The receiver can be controlled alternatively via TTL signals with BCD code or in master-slave mode from another receiver.

In the panoramic display EZP, a smaller or wider frequency range at the level of the second IF of 10.7 MHz can be displayed.

The set is completely solid state.

The VHF / UHF receiving system ET-001 from Rohde & Schwarz was not only part of the P-728 VHF direction finding system, but also used separately as a monitoring receiver with army designation E-652.

• Receiver ESM 2 on www.radiomuseum.org