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Ferrite rod antennas in AM broadcast receivers

Discussion in 'Electronic Design' started by George, Sep 3, 2012.

  1. Guest

    If you have plenty of power to burn (i.e. _not_ battery powered), use
    sufficient collector/drain current, say 1 A, use push-pull, use
    negative feedback to linearize and the front end is not going to be
    the problem, the problem starts with the ADC.
     
  2. Guest

    If you're standing next to the transmitter, the front end is the problem.
    Well, everything is the problem.
     
  3. Guest

    It's the same problem, though. Once the system goes nonlinear it's all over.
     
  4. josephkk

    josephkk Guest

    Any way you want to slice it, OP wants to do something with radio signals
    in the AM band. That implies a receiver of some kind.

    ?-)
     
  5. amdx

    amdx Guest

    This one uses an RTL2832U-based DVB-T USB dongle with the Elonics
    E4000 tuner.

    The modules consist of
    1. A switching unit with a VHF broadcast band filter
    2. A 300 KHz to ~60MHz pre-amplifier of around 18dB gain
    3. An HF to VHF converter DC to 60 MHz input up-converted to 125 to
    185MHz output
    4. A VHF 50MHz to ~2GHz pre-amplifier of up to 18dB gain
    5. A PC power rail filter
    6. A voltage regulator for an external unit

    http://makearadio.com/visitors/nick-sdr2.php

    Mikek
     
  6. Guest


    Long-delayed follow-up ... :eek:)

    You were right about using a mag loop followed by an amp to get broadcast band receive antenna performance equivalent to that to a ferrite stick but without the tuning requirement.

    We contracted the design and will have a demo unit in a few weeks. Thanks.
     
  7. iiiijjjj

    iiiijjjj Guest

    It has taken many person hours to answer this question. Since it is so simple the OP should just try it in the lab with an oscilloscope. Is that not the easy answer?
     
  8. Phil Allison

    Phil Allison Guest

    "iiiijjjj"
    ** You have totally missed the central issue in the story.



    ..... Phil
     
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