SW Dual Conversion R9702

Tecsun 德生通用电器制造有限公司 Tecsun General Electric Manufacturing Co., Ltd; Dongguan (Guangdong, SC)

Data
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Collections

  • Year
  • 2001
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 71931

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

 Technical Specifications

  • Main principle
  • Superhet, double/triple conversion; ZF/IF 10700/455 kHz
  • Wave bands
  • Broadcast, Short Wave plus FM or UHF.
  • Power type and voltage
  • Batteries / addl. power jack / AA: 2 x 1.5 / 3 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical / Ø 5.7 cm = 2.2 inch
  • Power out
  • 0.5 W (unknown quality)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: SW Dual Conversion R9702 - Tecsun 德生通用电器制造有限公...
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 117 x 77 x 30 mm / 4.6 x 3 x 1.2 inch
  • Notes

  • The Tecsun R9702 SW Dual Conversion model uses a chassis manufactured in several versions since its release in 2001, and was produced for Grundig as well for some time around 2004.

    It is a pure analog pocket world receiver with digital frequency display, clock and alarm, FM Stereo (on headphones), MW, and double conversion on SW (1st IF 10700 kHz, 2nd IF 455 kHz), It runs from two "AA" 1.5V dry batteries or from DC 3V from an external power supply (positive in the outer sleeve).

    Frequency coverage

    • FM: 87 - 108 MHz
      • 100 kHz display resolution
      • Noise limit sensitivity: <10μV 
    • MW: 525 - 1610 kHZ
      • 1 kHz display resolution
      • Noise limit sensitivity: 1mV/m 
    • SW I: 5.90 - 9.90 MHz 
      • 10 kHz display resolution
      • Noise limit sensitivity: <30μV 
    • SW II: 11.60 - 17.90 MHz 
      • 10 kHz display resolution
      • Noise limit sensitivity: <30μV 
    • Single signal selectivity is better than 20dB 

     Accessories

    • Soft pouch
    • Stereo headphones
    • External SW antenna (wire with clip to attach to the telescopic antenna)
    • User manual 

     

  • Net weight (2.2 lb = 1 kg)
  • 0.180 kg / 0 lb 6.3 oz (0.396 lb)
  • Price in first year of sale
  • 30.00 $

 Collections | Museums | Literature

Collections

The model SW Dual Conversion is part of the collections of the following members.

 Forum

Forum contributions about this model: Tecsun 德生通用电器...: SW Dual Conversion R9702

Threads: 1 | Posts: 1

The Tecsun R9702 uses two PCB assemblies:

  • Analog Receiver PCB, with 23 transistors and 2 IC's
  • Digital MCU PCB, with 9 transistors and 2 IC's

 

Radio PCB combo versions found so far:

Analog Receiver PCB Digital MCU PCB Components Interconnect RF IC Audio IC
R-9702V3 R&D ZXZ 5.25 R9702C-V9 2006.11.15 Mostly discrete Rainbow colored wires LA1827 CXA1622M
R-9702(D2111) V5 2013.06.25  R-9702B-V2 2011.05.30 Mostly SMD Gray flat cable (Y)D2111F CD1622CB

 

R-9702(D2111) V5 2013.06.25 ​Analog Receiver PCB main parts

  • IC3   (Y)D2111F, seems similar to TA2111F - FM/AM RF tuner
  • IC4   CD1622CB - Audio power amp, stereo on headphones, mono bridged on speaker
  • Q1    2SK436 FET - SW RF front-end
  • Q2, Q3   2SK436 FET - SW RF Balanced Mixer 
  • Q10, Q8, Q6, Q11 S9018 - SW1/SW2 1st Local oscillator
  • Q4    S9018 - 1st IF 10700 kHz
  • CF4   SW 10.7S filter
  • CF2   FM 10.7S filter
  • CF3   AM 455J filter
  • Q12   S9018 AM 2nd local osc 10.245 kHz
  • CY1   10.245 MHz xtal

R-9702B-V2 2011.05.30 Digital MCU PCB main parts

  • IC1  CD3610CR MCU, it is a SC3610 on a 36-pin PCB holder - Frequency reading, Clock/Alarm, and LCD driver, installed under metal shield
  • IC2  74HC138 1-of-8 decoder - RF band selector

Other components

  • SP 16T57Z-2  Speaker  16 Ohm, 0.25 Watt, 57 mm diameeter
  • MW ANT  85mm long with 7x3mm cross section, with 34mm length litz coil

 

Jose Mesquita, 30.Aug.22

Weitere Posts (1) zu diesem Thema.