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Shuanghuan 双环 712

Shuanghuan 双环 712; Dandong Nr.4 丹东无线电四厂 (ID = 823324) Radio
 
Shuanghuan 双环 712; Dandong Nr.4 丹东无线电四厂 (ID = 823326) Radio
Shuanghuan 双环 712; Dandong Nr.4 丹东无线电四厂 (ID = 822911) Radio
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Shuanghuan 双环 712; Dandong Nr.4 丹东无线电四厂 (ID = 822911) Radio
Dandong Nr.4 丹东无线电四厂: Shuanghuan 双环 712 [Radio] ID = 822911 618x506
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For model Shuanghuan 双环 712, Dandong Nr.4 丹东无线电四厂 Dandong Nr.4 Radio Factory; Dandong (Liaoning, NE) :
Picture from the Transistor Radio Circuit Manual August 1981 vol. 1 of 5 (internal 03), page 404 for reference when somebody is uploading real photos and as reference for collectors, comparing models.
 
Country:  People's Republic of China
Manufacturer / Brand:  Dandong Nr.4 丹东无线电四厂 Dandong Nr.4 Radio Factory; Dandong (Liaoning, NE)
Year: 1972 ?? Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 8: 3AG23 3AG23 3AG23 3AX31 3AX31 3AX31 3AX31 3CK3 2CP10 2AP9 2CW14
Main principle Superheterodyne (common); ZF/IF 465 kHz; 3 AF stage(s)
Tuned circuits 5 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Line / Batteries (any type) / AC 220 / Battery 6 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Radiomuseum.org Model: Shuanghuan 双环 712 - Dandong Nr.4 丹东无线电四厂 Dandong
Material Various materials
Shape Tablemodel with Clock ((Alarm-) Clock Radio).
Dimensions (WHD) 380 x 170 x 140 mm / 15 x 6.7 x 5.5 inch
Notes The radio model Shuanghuan 双环 712 (Double Ring) offers the following key features 主要性能: Frequency range 频率范围: broadcast 535 - 1605 kc. Sensitivity 灵敏度: < 1.5 mV/m. Selectivity 选择性: 20 dB (S/N). Set audio output 额定功率: 150 mW. Electric power consumption 电源消耗 at zero signal 零信号: 15 mA, at max. it is 100 mA. The IF 中频频率 is most probably 465 kc. Loudspeaker impedance is 8 ohm. 7 transistors are for reception and one (3CK3) for the power supply. 2 diodes plus one (2CW14) for the power supply.
Literature/Schematics (1) 03-Transistor Radio Circuit Manual 1981 August (1 of 5) (page 404.)

Model page created by Ernst Erb. See "Data change" for further contributors.



All listed radios etc. from Dandong Nr.4 丹东无线电四厂 Dandong Nr.4 Radio Factory; Dandong (Liaoning, NE)
Here you find 1 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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