Thread: 450 ohm feedline to a multiband vertical
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Old November 8th 07, 03:38 PM posted to rec.radio.amateur.antenna
Robert M. Kimbrell Robert M. Kimbrell is offline
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First recorded activity by RadioBanter: Nov 2007
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Default 450 ohm feedline to a multiband vertical
Cecil Moore wrote:

: Assuming the feedpoint impedance on 40m is somewhere
: around 35 ohms, the 40m SWR on the 450 ohm line would
: be around 13:1. Assuming the feedpoint impedance on
: 20m is around 1200 ohms, the 20m SWR on the 450 ohm
: line would be around 3:1.

What I am trying to understand is the current on each conductor of the 450
ohm line. Are the radials a high impedance on 20 meters with a 33 foot
radiator? I can disconnect the radials and have an endfed zep and it
works ok. Connecting the radials makes the antenna perform better and the
tuning is different on the tuner in the shack.

--
Bob Kimbrell W7KU Kansas City, MO

http://kimbrell.freeshell.org/
SDF Public Access UNIX System - http://sdf.lonestar.org
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