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RF transceivers - How to reduce operating frequency ?

Discussion in 'Electronic Design' started by [email protected], Apr 10, 2007.

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  1. Guest

    Hi people, I want to know some practical ways of reducing the carrier
    frequency of basic RF transceivers. There are very few RF transceivers
    which operate at HF frequency range (40Mhz). So basically instead of
    the 300Mhz FSK output of transceiver, I want to downconverter it to
    40Mhz, how should I go about this ? All I can think of is using a
    varacter diode with the VCO, but will using a mixer/downconverter IC
    work ?

  2. Gary Tait

    Gary Tait Guest

    wrote in
    Yuo will need to rebuild the whole transmitter and receiver from the ground
    up, basically, to change from 300 Mhz to 40 Mhz.

    Then again, you probably could use a mixer with a stable local oscillator
    of about 260 Mhz.
  3. Guest


    Would using a mixer affect the performance of the system by much ?
    Eg. power output, efficiency, etc.
  4. Gary Tait

    Gary Tait Guest

    wrote in
    It may introduce some losses. If you are using it in a transmitter,
    you'd use in with a low power signal out (possibly with an attenuator,
    or bypass the amplifier stage in the original trasnmitter), and filter
    and amplify that with an amplifier appropriate to the new band.
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