Tuning Head HH-11

Watkins Johnson Company, Gaithersburg (MD)

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  • Year
  • 1973 ?
  • Category
  • Radio module post 1925 (not a part, not a key)
  • Radiomuseum.org ID
  • 364597

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Wadley-Loop principle (including dual superhet); ZF/IF 67800/21400 kHz; something special ? Please give information (notes)
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Powered by external power supply or a main unit.
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Tuning Head HH-11 - Watkins Johnson Company,
  • Shape
  • Chassis only or for «building in»
  • Notes

  • The Type HH-11 Tuning Head is designed to operate as a plug-in
    module with the 205 Series Receivers. The HH-11 tunes the
    frequency range of 2 to 30 MHz and provides a 21.4 MHz IF output for the receiver. The tuning head can be manually or electrically tuned depending upon the operating mode and a tuning voltage range of +10.3 to -10.3 volts from the receiver will tune the unit from the low band limit to the high band limit.

    The unit is a double conversion type containing a voltage tuned
    first converter, crystal controlled second converter and circuits to shape the tuning voltage input from the 205-(X) Receiver to a linear volts - versus -frequency tuning characteristic for the first converter. In addition to the 21.4 MHz IF output, buffered local oscillator output and a five wire code are provided for operation of the accessory DRO-308 Frequency Counter, DRX-308 Digital Readout Extender, and VH-105/106 Marker Accessory. Additional jumper wires in the HH-11 select the appropriate IF bandwidths for both the PAN and SECTOR operating modes of the 205 Receiver.

     

     

  • Net weight (2.2 lb = 1 kg)
  • 3.7 lb (3 lb 11.2 oz) / 1.680 kg
  • Mentioned in
  • - - Manufacturers Literature (Instruction Manual for Type HH-11 Tuning Head, Watkins-Johnson Co., P/N C/200/3/16/73/HED)
  • Author
  • Model page created by Pius Steiner. See "Data change" for further contributors.

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