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Topband: Delta Loop vs Antenna Analyzer

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Subject: Topband: Delta Loop vs Antenna Analyzer
From: D Rodman MD <>
Date: Mon, 3 Dec 2012 23:22:05 -0500
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My 160m antenna died several weeks ago from a bad coax feed line and was 
just Sunday after the contest.  I have tried several antenna analyzers and none
seem to work with the loop antenna.  I designed the antenna for 100 ohm feed and
always wanted to put a half wavelength coax on an analyzer to measure R and J to
achieve the best match.  Calculated series transformer of 50 and 75 ohm coax
seems to match the antenna quite well as anticipated.  But, no matter how I try
with any of my many devices, I can't get the boxes to work with the loop.  The
readings are not consistent.  They just don't seem to like the antenna.  Other
wire or yagi antennas work as expected.  Questions about if others have tried to
measure loops or theoretical reasons why the various devices can't read the
impedance are obvious and responses welcome.  Thanks.

David J Rodman, MD

Assistant Clinical Professor
Department of Ophthalmology

Office 716-857-8654

Topband reflector -

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