VLF Comparitor 117A

Hewlett-Packard, (HP); Palo Alto, CA

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  • Year
  • 1965–1975 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 341554

 Technical Specifications

  • 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.

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