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Re: Topband: 'Hairpin' matching

To: topband@contesting.com
Subject: Re: Topband: 'Hairpin' matching
From: John Chappell G3XRJ <john@g3xrj.com>
Date: Fri, 20 Sep 2013 15:05:25 +0100
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Just measured the 'hairpin' coil for my 160m 38 foot top loaded - coil and 2 x 18 foot wires - antenna.

Feedpoint  impedance without match is 12 ohms.
Placing shunt coil to ground of 1.7microH and tx sees 50 ohm 1:1.

Only problem with the vertical being so short the bandwidth is only 12 khz between 2:1 points.

John G3XRJ


The excellent web site for calculating matching network values should have been:

http://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html

not the one I posted yesterday.

73,
Tom G3OLB

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