VLF Comparitor 117A
Hewlett-Packard, (HP); Palo Alto, CA
- Country
- United States of America (USA)
- Manufacturer / Brand
- Hewlett-Packard, (HP); Palo Alto, CA
- Year
- 1965–1975 ?
- Category
- Service- or Lab Equipment
- Radiomuseum.org ID
- 341554
- Number of Transistors
- Semiconductors present.
- Semiconductors
- Main principle
- TRF (Tuned-Radio-Frequency but use of regeneration unknown)
- Wave bands
- Long Wave and/or Very Low Frequency (VLF).
- Power type and voltage
- Alternating Current supply (AC) / 117 Volt
- Loudspeaker
- - - No sound reproduction output.
- Material
- Metal case
- from Radiomuseum.org
- Model: VLF Comparitor 117A - Hewlett-Packard, HP; Palo Alto
- Shape
- Rack
- Notes
-
The HP model 117 VLF Comparator was a receiver and antenna system used to compare a local lab frequency standard against the 60 kHz WWVB transmissions from Fort Collins CO. The rack unit is of a Tuned Radio Frequency (TRF) design. The amplified and remotely mounted loop antenna (HP part number 10509A) came in earlier nuvistor tube and later J-FET versions. The antenna is powered by 35 Vdc via the antenna feed line. Has a meter and paper plotter to display and record the phase difference between the local frequency standard and WWVB.
- Author
- Model page created by Tom Seeger. See "Data change" for further contributors.
- Other Models
-
Here you find 394 models, 362 with images and 139 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA