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need to power remote active antenna

Discussion in 'Electronic Design' started by Cruiser, Oct 6, 2003.

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  1. Cruiser

    Cruiser Guest


    I built an active antenna and it works fine, on the bench in the
    basement what I want to do is put it up outdoors and power it
    with the same coax as the signal..... I tried using caps at both ends
    (0.1) to isolate the 9 volts dc from the signal , but for some reason I
    don't understand my signal is not coming thru !

    Where did I go wrong?

  2. Didn't you isolate the power supply at the receiver end with suitable
    RF choke, and then the same at the active antenna end?

    If you just put the power supply across the coax, it will short out
    the RF signal. And if you just put bypass capacitors across the coax,
    that's going to short out the RF signal too.

  3. R.Legg

    R.Legg Guest

    Feed the DC into the cable by means of an RF choke and recover the DC
    from the remote point using a similar choke. If the signal has low
    frequency components as well, a larger choke may be required.

    The DC rail normally looks like a short at the source, and is AC
    decoupled at the remote end.

  4. Cruiser

    Cruiser Guest

    Thanks for the information .....
  5. Cruiser

    Cruiser Guest

    Thanks for the information..... A great newsgroup....
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