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Stabling frequency of RF oscillator

Discussion in 'Electronic Basics' started by svetoslav belchev, Apr 6, 2005.

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  1. I have a smal RF UHF oscillator with antenna, for use like sound
    transmitter. It is colpits osc. How to stable it's frequency ? Because
    when I touch it or antenna or simply move the device it's frequency
    untunes. I want to be able to move with hands while it transmits my
    speach.
    Many thanx forwadly.
     
  2. Andrew Holme

    Andrew Holme Guest

    You could try adding a buffer/amplifier stage (or two) between the
    oscillator and the antenna, AND mount it in a screened metal box, but
    even then you'll still have temperature-related drift. This became
    more of a problem with the advent of PLL-controlled receivers which
    remain dead on-frequency. Older receivers had AFC which could track a
    drifting transmitter. These days, you need a crystal-controlled
    transmitter too: either with frequency multiplier stages, or a PLL to
    generate the final output frequency.
     
  3. You could try adding a buffer/amplifier stage (or two) between the
    I want to try simple circuit with one ampliffer stage, where to find circuit ?
     
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