• Country
• People's Republic of China

• Manufacturer / Brand
• Shanghai 上海长空无线电厂 Shanghai Changkong Radio Factory; Shanghai

• Year
• 1980 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 337308

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

• Number of Transistors
• 16

• Semiconductors
• 3CG14 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3DG6 3AX31 3AX31 3AX31

• Main principle
• Superhet, double/triple conversion; ZF/IF 13500/465 kHz; 2 AF stage(s)

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

• Power type and voltage
• Dry Batteries / 4 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 10 cm = 3.9 inch

• Power out
• 0.3 W (0.7 W max.)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Seagull 715 - Shanghai 上海长空无线电厂

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 266 x 144 x 60 mm / 10.5 x 5.7 x 2.4 inch

• Notes

• With 1 AM and 6 SW bands, Haiou (Seagull) 715 16-transistor portable radio receiver is a premium product developed for consumer market in early 1980s. It is a superheterodyne receiver with two IF conversions (for SW only), 1^st at 13.5 MHz and 2^nd at 465 kHz, and one un-tunable RF stage. These features enable high sensitivity, small fading and strong image rejection, making it an ideal choice for those in remote areas.

  It also features a unique tone controller consisted of two switches instead of a potentiometer. By using the four combinations of the on and off states of these switches, tone can be customized for specific listening experience.

  In addition, it uses a BJT differential pair to enable balanced mixer, which is also rarely seen in consumer radio receivers.

  This model has at least two variants, one using Si PNP transistor at RF stage while the other using Si NPN transistor at RF stage.

• Net weight (2.2 lb = 1 kg)
• 1.3 kg / 2 lb 13.8 oz (2.863 lb)

• Price in first year of sale
• 150.00 RMB

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Yu Zhu. 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