From: "James Cowburn" <james.cowburn@virgin.net>
To: <rsgb_lf_group@blacksheep.org>
References: <3ED0CD52FE44410585B4FD49BC73AF8C@JimPC>
Date: Thu, 9 Jul 2009 18:33:35 +0100
Message-ID: <002801ca00bb$644af9c0$0217aac0@jimdesk>
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Subject: LF: RE: LF Tuning Aids
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Hi Jim 

Looks excellent.  Giving me some good ideas

Thanks for uploading this


Jim G7NKS

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of James Moritz
Sent: 09 July 2009 01:54
To: rsgb_lf_group@blacksheep.org
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