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Cohen Longwave Receiver

Cohen Longwave Receiver ; National Electric (ID = 1985301) mod-pre26 Cohen Longwave Receiver ; National Electric (ID = 1985303) mod-pre26
Cohen Longwave Receiver ; National Electric (ID = 1985304) mod-pre26 Cohen Longwave Receiver ; National Electric (ID = 1985305) mod-pre26
Cohen Longwave Receiver ; National Electric (ID = 1985306) mod-pre26 Cohen Longwave Receiver ; National Electric (ID = 1985307) mod-pre26
Cohen Longwave Receiver ; National Electric (ID = 1985308) mod-pre26
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Cohen Longwave Receiver ; National Electric (ID = 1985301) mod-pre26
National Electric: Cohen Longwave Receiver [mod-pre26] ID = 1985301 1400x1120
Select picture or schematic to display from thumbnails on the right and click for download.
For model 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.
alternative name
 
National Electric Signaling Co. || National Electrical Supply Co.
Year: 1914–1916 ? Category: Radio module pre 1926 (not a part, not a key)
Main principle Tuner pre 1926 (not a wave trap)
Wave bands Long Wave and/or Very Low Frequency (VLF).
Details
Power type and voltage No Power needed
Loudspeaker - For headphones or amp.
Power out
from Radiomuseum.org Model: Cohen Longwave Receiver - National Electric Signaling Co
Material Wooden case
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.

Model page created by Richard Groshong. See "Data change" for further contributors.



All listed radios etc. from National Electric Signaling Co. (NESCO) or Supply; Washington, D.C.
Here you find 30 models, 28 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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