Short Wave Adapter WM-20
Hitachi Ltd.; Tokyo
- Country
- Japan
- Manufacturer / Brand
- Hitachi Ltd.; Tokyo
- Year
- 1965 ?
- Category
- Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter
- Radiomuseum.org ID
- 323811
-
- alternative name: Hitachi Sales Corp. of America
- Number of Transistors
- 2
- Main principle
- Superheterodyne (common)
- Tuned circuits
- 2 AM circuit(s)
- Wave bands
- Wave Bands given in the notes.
- Details
- Converter
- Power type and voltage
- Storage Battery for all (e.g. for car radios and amateur radios) / 6 or 12 Volt
- Loudspeaker
- - - No sound reproduction output.
- Material
- Metal case
- from Radiomuseum.org
- Model: Short Wave Adapter WM-20 - Hitachi Ltd.; Tokyo
- Shape
- Chassis only or for «building in»
- Dimensions (WHD)
- 205 x 45 x 1005 mm / 8.1 x 1.8 x 39.6 inch
- Notes
-
Short Wave Adapter WM-20 receives 90, 60, 49, 41, 31, 25, 19, 16, and 13 meter bands, and converts them to the Medium Wave band. The Adapter is connected between the car aerial and the existing car radio receiver, and in conjunction with the receiver forms a double superheterodyne system. During operation, the receiver used with the adapter is switched to the Medium Wave band, and the required station is then tuned in with the manual tuning control of the receiver. Operation of the OFF button de-energizes the Short Wave Adapter but leaves the car radio receiver operational. Two slide switches are fitted on the underside of the adapter, and can be set for Positive or Negative ground, and 6V or 12V battery supply.
The Oscillator stage uses a 2SA351 PNP Germanium transistor, while the Mixer stage uses a 2SA350 PNP Germanium transistor, both operating internally with a Zener limited/stabilized 6VDC power supply. The current consumption of the unit is just 6mA from a 12VDC supply.
- Net weight (2.2 lb = 1 kg)
- 0.770 kg / 1 lb 11.1 oz (1.696 lb)
- Mentioned in
- Wireless World (The), London (WW, 79)
- Author
- Model page created by Jose Mesquita. See "Data change" for further contributors.
- Other Models
-
Here you find 1056 models, 946 with images and 242 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Hitachi Ltd.; Tokyo
Collections
The model Short Wave Adapter is part of the collections of the following members.