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ADF7011 433MHz transmitter

Discussion in 'Electronic Design' started by Rene Tschaggelar, Mar 2, 2005.

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  1. There are these extremely simple to apply transmitter chips
    such as the ADF7011, which are a 76kbit transmitters including
    VCO & PLL. A few R & C and you're done. This gives me complete
    transmitter on a thumbnail, just the actual microcontroller
    delivering the data is to be added plus a quartz signal. 30mA
    supply at 3V and it costs 4$.
    Now comes the stupid part. How am I expected to receive the
    signals ? Yes, I could build a PLL with a VCO, crystal, then
    perhaps an AFC to lock to the frequency unless I'm hopping
    the freqeuncy. Downmix to whatever and decode the bits.
    It takes few hundred mA and perhaps a handsized pcb.
    Or downconvert with a PLL multiplied Quartz from a DSP,
    sample at few MSamples and have some code to extract the bits.

    I'm somehow expecting a thumbnail sized receiver equally
    trivial to build like the transmitter. No ?
    Did I miss something ?

  2. Tim Wescott

    Tim Wescott Guest

    Linear tech, Maxim, and I think ADI, have some direct-conversion
    quadrature receivers that'll get you down to baseband -- decoding the
    data is your job, but it should be quite doable with a DsPIC, other
    small DSP, or (gasp) analog circuitry.
  3. nope, AD only seem to make TX's or RX/TX,2877,ADF7020,00.html
    but no RX's
    so you might need a transceiver strapped into RX mode.

    Dumb eh?


    "An eye for an eye makes the whole world blind"
  4. Apparently. They somehow figured the need for a receiver
    to be (much) smaller than for transmitter or transceivers.
    Or they figured it to be done differently, such a with an
    ADC at a subharmonic.

  5. Luhan Monat

    Luhan Monat Guest

    Maybe some of these...
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