• Country
• United States of America (USA)

• Manufacturer / Brand
• Hewlett-Packard, (HP); Palo Alto, CA

• Year
• 1971 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 139238

• 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: Transfer Oscillator 5257A - Hewlett-Packard, HP; Palo Alto

• Notes
• Plug-in module for 5345L, 5246L or 5247M HP counters; extends the frequency of the base instrument to cover 50 MHz to 18 GHz. Input sensitivity 100 mV up to 15 GHz, 140 mV up to 18 GHz; N coax connector. 3-digit thumb-switch harmonic selector. Precision VFO which can be phase-locked on the input signal.

• Net weight (2.2 lb = 1 kg)
• 3.3 kg / 7 lb 4.3 oz (7.269 lb)

• Source of data
• - - Manufacturers Literature

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 391 models, 359 with images and 138 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA