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LF: LF Tuning Aids

from [James Moritz] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: LF Tuning Aids
From: "James Moritz" <[email protected]>
Date: Thu, 9 Jul 2009 01:54:09 +0100
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Dear LF Group,
I have just uploaded a file (LF_tuning_aids.pdf) to the UK500kHz group site at http://groups.google.com/group/uk500khz/files.
This is an updated/expanded version of my old "LF tuning meter" article that has been on G3YXM's web pages for some time. It describes a number of devices for monitoring antenna matching I have used on 136kHz and 500kHz, including:
-The original 136kHz LF tuning meter design, indicating voltage, current and phase, with updates for dual band 136k/500k use.
-The "Scopematch", for displaying antenna feeder voltage and current waveforms on a dual trace scope 

-A couple of simple SWR bridge designs

Hope it proves to be of interest - any comments welcome.

Cheers, Jim Moritz
73 de M0BMU
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