433MHz PLL

Discussion in 'General Electronics Chat' started by AndyPLL, May 3, 2006.

  1. AndyPLL

    Thread Starter New Member

    May 3, 2006
    3
    0
    Hi, I am hoping to detect the phase difference from a 433.92MHz carrier signal detected at two antennas, where one antenna is about a 1/4 wavelength further from the transmitter than the other.

    The circuit looks as follows in quote. I use PLLs to ensure phase lock on the carrier and pass the 2 signals to a phase detector:

    I hope you can understand my circuit diagram. A second Bandpass filter after the BJT Amps would double the 6dB of the first to 12dB, so I will probably put those in each line aswell.


    My questions are:

    1) Do I really need the PLLs? Can I just put the antenna signals into the Phase difference detector without phase lock, or do I really need the VCO (powered) output?
    2) If PLLs needed, what ICs do you recommend? Do I need special PLLs capable of locking onto a 433.92MHz signal? Or can I somehow use standard 4046/LM565??
    3) What IC for final phase comparator? Anything special required?


    I hope you can answer my questions!! If you can, then you have probably guessed that the circuit is designed to detect which antenna is closest to the transmitter source, within a wavelength as per diagram in quote:


    Antennae are about a foot apart.

    HOPE YOU CAN HELP!!!!!



     
  2. AndyPLL

    Thread Starter New Member

    May 3, 2006
    3
    0
  3. Grant

    Member

    Mar 5, 2006
    17
    0
    Aw..come on Andy, don't be like that! We thought RadioRon's advice to you was quite helpful- you are not the only one who uses another forum!
    Cheers,
    Grant
     
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