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LF: RE: LF Tuning Aids

To: <[email protected]>
Subject: LF: RE: LF Tuning Aids
From: "James Cowburn" <[email protected]>
Date: Thu, 9 Jul 2009 18:33:35 +0100
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Hi Jim 

Looks excellent.  Giving me some good ideas

Thanks for uploading this


Jim G7NKS

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of James Moritz
Sent: 09 July 2009 01:54
To: [email protected]
Subject: LF: LF Tuning Aids

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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