- Country
- People's Republic of China
- Manufacturer / Brand
- Shanghai 上海长空无线电厂 Shanghai Changkong Radio Factory; Shanghai
- Year
- 1968 ??
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 178075
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Transistors
- 7
- 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 / 6 Volt
- Loudspeaker
- Permanent or electro-dynamic (moving coil), system not known yet.
- Material
- Plastics (no bakelite or catalin)
- from Radiomuseum.org
- Model: Haiou 海鸥 7A2 - Shanghai 上海长空无线电厂
- Notes
- The model Haiou 海鸥 7A2 (Seagull) has the following key features 主要性能: Frequency range 频率范围: broadcast band 535 - 1605 kc. Sensitivity 灵敏度: < 1 mV/m. Selectivity 选择性: > 14 dB S/N. Set audio output 额定功率: 150 mW (300 mW). Electric power consumption 电源消耗 at zero signal 零信号: 15 mA. The IF frequency is 465 kc. Loudspeaker impedance is 8 ohm. The schematic on page 97 shows a different character than Haiou has - but it may be an error - or our assumption is wrong. Manual 03 notes 3AX31B (3 instead of 8) and 3BX81B as output transistor which is presumably an error.
- Mentioned in
- 03-Transistor Radio Circuit Manual 1981 August (1 of 5) (page 123.)
- Literature/Schematics (1)
- 02-Radio Manual unknown date, 380 pages (page 97, drawing 203.)
- Author
- Model page created by Ernst Erb. See "Data change" for further contributors.
- Other Models
-
Here you find 14 models, 7 with images and 10 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Shanghai 上海长空无线电厂 Shanghai Changkong Radio Factory; Shanghai