Frequency Standard FS-135-C

Hammarlund Mfg. Co. Inc.; New York, NY

Data
Forum
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Collections

  • Year
  • 1947 ?
  • Category
  • Miscellaneous (Other, Various) - see notes
  • Radiomuseum.org ID
  • 329935

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 1
  • Valves / Tubes
  • Main principle
  • Special principle (see notes)
  • Wave bands
  • - without
  • Power type and voltage
  • Powered by external power supply or a main unit.
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Frequency Standard FS-135-C - Hammarlund Mfg. Co. Inc.; New
  • Shape
  • Chassis only or for «building in»
  • Notes

  • The Hammarlund FS-135-C was an accessory crystal calibrator module (100 kHz crystal and oscillator tube) that had to be retrofitted by the owner of a Hammarlund HQ-129X (early), Hammarlund HQ-129X (late), or other amateur receiver (including drillling mounting holes and wiring).  It was not offered as a "factory-original' variant.  The instructions recommend installation as far from the power transformer as possible.  That is why it is often seen in the Hammarlund HQ-129X in the rear left corner of the chassis (viewing from front) with new holes drilled by the receiver owner for the mounting screws and the power cable.  Hammarlund also suggested mounting an additional power switch on the front panel (thus a factory recommended modification) or optionally pulling the tube out when the calibrator was not in use and storing it on the chassis to assure temperature equivalence when needed.

  • Author
  • Model page created by Rich Post. See "Data change" for further contributors.

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