Cohen Longwave Receiver
National Electric Signaling Co. (NESCO) or Supply; Washington, D.C.
- Country
- United States of America (USA)
- Manufacturer / Brand
- National Electric Signaling Co. (NESCO) or Supply; Washington, D.C.
- Year
- 1914–1916 ?
- Category
- Radio module pre 1926 (not a part, not a key)
- Radiomuseum.org ID
- 281132
-
- alternative name: National Electric Signaling Co. || National Electrical Supply Co.
- Main principle
- Tuner pre 1926 (not a wave trap)
- Wave bands
- Long Wave and/or Very Low Frequency (VLF).
- Power type and voltage
- No Power needed
- Loudspeaker
- - For headphones or amp.
- Material
- Wooden case
- from Radiomuseum.org
- Model: Cohen Longwave Receiver - National Electric Signaling Co
- Shape
- Tablemodel, low profile (big size).
- Dimensions (WHD)
- 23 x 16 x 12 inch / 584 x 406 x 305 mm
- Notes
-
This is an early longwave receiver (1,000 to 10,000 meters) based on the Louis Cohen patent of 1914 (U.S. patent 1,123,098). It was made by the National Electrical Supply Co. and is actually a tuner designed for regenerative receiver operation. Note that Dr. Louis Cohen was a Professor of Radio Engineering at George Washington University and a famous consulting radio engineer in Washington D.C. who worked for a variety of U.S. military and government organizations. His receiver designs were used by the U.S. Navy series of Cohen Receivers (e.g. Types A, B, C). Dr. Cohen also participated in the Radio Regulation Conferences in Washington with then Secretary of Commerce Herbert Hoover, the 31-st President of the United States.
- Author
- Model page created by Richard Groshong. See "Data change" for further contributors.
- Other Models
-
Here you find 31 models, 29 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Electric Signaling Co. (NESCO) or Supply; Washington, D.C.
Collections
The model Cohen Longwave Receiver is part of the collections of the following members.