Youyi 友谊 BX-711

Youyi 友谊 BX-711; Nantong 南通无线电厂 (ID = 821357) Radio
Youyi 友谊 BX-711; Nantong 南通无线电厂 (ID = 821358) Radio
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Youyi 友谊 BX-711; Nantong 南通无线电厂 (ID = 821357) Radio
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Country:  People's Republic of China
Manufacturer / Brand:  Nantong 南通无线电厂 Nantong Radio Factory; Nantong (Jiangsu, E)
Year: 1972 ?? Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 7: 3DGM 3DGM 3DGM 3AX31A 3AX31A 3AX31A 3AX31A 2CP 2CP 2AP9 2AP9
Main principle Superheterodyne (common); ZF/IF 465 kHz; 3 AF stage(s)
Tuned circuits 5 AM circuit(s)
Wave bands Broadcast only (MW).
Power type and voltage Dry Batteries / 3 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Model: Youyi 友谊 BX-711 - Nantong 南通无线电厂 Nantong
Material Plastics (no bakelite or catalin)
Shape Very small Portable or Pocket-Set (Handheld) < 8 inch.
Dimensions (WHD) 195 x 110 x 46 mm / 7.7 x 4.3 x 1.8 inch
Notes The radio model Youyi 友谊 BX-711 (Freindship) receives broadcast 535 - 1605 kc. Sensitivity 灵敏度: 2 mV/m. Selectivity 选择性: 14 dB (S/N). Set audio output 额定功率: 100 mW. Electric power consumption 电源消耗 at zero signal 零信号: 20 mA, at max. it is 100 mA. The IF frequency is most probably 465 kc. Loudspeaker is 8 ohm. 4 diodes.
The radio models Youyi 友谊 BX-711, Youyi 友谊 BX-712 and Youyi 友谊 BX-713 share the same documentation and schematic at manual 03, page 291/292.
Literature/Schematics (1) 03-Transistor Radio Circuit Manual 1981 August (1 of 5) (page 291.)

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

All listed radios etc. from Nantong 南通无线电厂 Nantong Radio Factory; Nantong (Jiangsu, E)
Here you find 10 models, 2 with images and 9 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.