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[antennaware] Feeding cable lenght

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Subject: [antennaware] Feeding cable lenght
From: (Serge Pozhidaev)
Date: Wed, 4 Aug 1999 01:18:24 +0300

> From: K4SB 
> 1. An electrical 1/2 wave, or multiples thereof, of any type and
> impedence will ALWAYS repeat the load impedence at the opposite
> end. This occurs regardless of the charateristic impedence of the
> line. For instance, if you have a 50 ohm load and a 50 ohm Tx
> output, AND the coaxial line is an electircal multiple of 1/2
> wave, it matters NOT what the impedence of the coax ( or whatever
> else you use ) is. You can use any impedence line, and the losses
> incurred will ONLY be that which is ordinary from the coax
> itself.

    From coax with bad SWR.

> If you use 600 ohm line, and load impedence is 50 ohms to
> 50 ohms, the only loss will be the normal attenuation of a line
> of that length. SWR is and will indicate 1:1

    But SWR in any point of this line will be 600/50=12:1.
And attenuation in line will be bigger then when SWR 1:1.
SWR never depends of line length.
(It will be only better on trx side because of losses in line).

73 de Serge UT2IO.

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