RP647

Siemens (& Halske, -Schuckert Werke SSW, Electrogeräte); Berlin, München

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  • Year
  • 1992 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 128682

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 44
  • Main principle
  • PLL, Phase-locked loop; ZF/IF 450/10700 kHz
  • Wave bands
  • Broadcast, Short Wave plus FM or UHF.
  • Power type and voltage
  • Batteries / addl. power jack / 4 × AA 1,5 / 6 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6.5 cm = 2.6 inch
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: RP647 - Siemens & Halske, -Schuckert
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 170 x 112 x 38 mm / 6.7 x 4.4 x 1.5 inch
  • Notes

  • Travel receiver with PLL synthesizer tuner, featuring FM Stereo on headphones (87.5 - 108 MHz), MW (531 - 1602 kHz), KW1/SW1 (3.2 - 7.3 MHz, KW2/SW2 (9.5 - 21.75 MHz), tuning channel steps of 5 kHz on SW1 and SW2, 9 kHz on MW, 50 kHz on FM, 20 station presets, clock / timer.

    The identical Sangean ATS-800 and Realistic DX-370 models share the same chassis, with slight variations, like different buttom colors or RF band coverage/channel stepping for specific markets.

    Technical details:

    The FM band uses a dedicated TA7358AP FM front end tuner IC (IC1) that passes the 10.70 MHz IF signal to a TA7758P AM/IF IF IC (IC2) followed by a AN7415S Stereo Multiplexer Demodulator.

    The MW and SW1/2 bands use a discrete RF Amplifier around a 2SK212E N-Channel JFET transistor (Q2), and then the RF signal is passed to the shared TA7758P AM Mixer/Osc and IF IC (IC2) using a frequency of 450 kHz.

    The VT tuning voltage is handled by a TA8126F DC-DC Converter and associated transformer encapsulated in a metalic shielding to prevent noise interference. Two SVC201SP varicaps (D1 and D2) are used on FM RF and Oscillator sections, and two KV1236Z-3 varicaps (D3 and D4) on the AM RF and Oscillator sections.

    The dual channel audio output is serverd by two AN7117 Low Power Consumption 1 W Audio Power Amplifiers (IC4 and IC5).

    The radio management, clock, and PLL functions are handled by a uPD1715G Microcontroller (IC101) and several discrete transistors and three auxiliary ICs. Several firmware versions were released during the production years for Siemens, like the uPD1715G-201 and uPD1715G-214 for the G4, and the uPD1715G-633-21 for the G4II.

  • Net weight (2.2 lb = 1 kg)
  • 0.4 kg / 0 lb 14.1 oz (0.881 lb)
  • Source of data
  • -- Original prospect or advert
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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