Wavemeter Decremeter (Military) Type CN 259
- United States of America (USA)
- Manufacturer / Brand
- National Electric Signaling Co. (NESCO) or Supply; Washington, D.C.
- Service- or Lab Equipment
- Radiomuseum.org ID
- alternative name: National Electric Signaling Co. || National Electrical Supply Co.
- Main principle
- Crystal or Solid State Detector
- Wave bands
- Broadcast (MW) and Long Wave.
- Power type and voltage
- Dry Batteries / 1.5 Volt
- - For headphones or amp.
- Wooden case
- from Radiomuseum.org
- Model: Wavemeter Decremeter Type CN 259 - National Electric Signaling Co
- Miscellaneous shapes - described under notes.
- Dimensions (WHD)
- 15.5 x 11 x 9 inch / 394 x 279 x 229 mm
This is a wavemeter and Kolster decremeter that was used to check and calibrate early wireless spark transmitters. The wavemeter checks the transmitter frequency and the decremeter checks the quality of the transmitted signal. At the time, a spark transmitters decrement (e.g. how rapidly the spark energy dissipates between sparks), was regulated to avoid generating interference with other transmitters. This device was often carried on-board ships by wireless inspectors to test the ships spark transmitters.
Receiving range: 85 to 5,000 meters
- Model page created by Richard Groshong. See "Data change" for further contributors.
- Other Models
Here you find 30 models, 28 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.