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Radio attenuation with resistors

Discussion in 'Electronic Basics' started by Andrew Howard, Dec 5, 2004.

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  1. I was just wondering, if you have a high frequency radio with an
    antenna, what would happen if you put a resistor before the antenna (in
    parallel and/or series with).
    Would it just attenuate it, or are there other effects as well?
    Would doing the reverse (removing a resistor) stuff any thing up?

    Andrew Howard
  2. Andrew Holme

    Andrew Holme Guest

    Yes, a large resistor in series, or a small resistor in parallel, would
    attenuate the signal. Small / large in this context is relative to antenna
    impendance which is normally pretty low e.g. 50 ohms.
    It depends. If the resistor is acting as an attenuator, then removal might
    cause overload.
    If the resistor was biasing the gate of a JFET pre-amp then removal would
    stop if from working.
  3. Thanks for the info.

    Andrew Howard
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