To: | topband@contesting.com |
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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 _________________ Topband Reflector _________________ Topband Reflector |
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