Message-ID: <001c01c09ff0$17a60ea0$1dce28c3@ericadodd>
From: "g3ldo" <g3ldo@ukonline.co.uk>
To: rsgb_lf_group@blacksheep.org
References: <000701c09dcf$6830e5c0$14b401d5@default> <14WhOa-2CnHRwC@fwd03.sul.t-online.com>
Subject: LF: Re: Impedance bridge
Date: Mon, 26 Feb 2001 12:31:03 -0000
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> Alan Melia schrieb:
> >......... I used a Hatfield LE300/A  RF bridge. The bridge was zeroed and
the
> >balance was achieved with the aerial,.........
> > Cheers de Alan G3NYK
>
> Hi Alan, Hi Dick,
> I`m testing lf-antennas since two years using a homebrew-bridge.
> I do not trust the measuring-results achieved with that bridge. changing
the
> symetric components (L) several times I still fiel it is cross-eyed (as we
would
> say in germany).
> Alan, where did you get that Hatfield-LE300/A-RF-bridge from ?
> Dick, where did you get that Wayne-Kerr-B.601-bridge from ?
> Uwe/dj8wx

You could build the 3-M bridge described in the LF Experimenter's handbook.
It has the virtue of simplicity, has no variable components and is
self-calibrating. The only additional items of equipment are a digital
voltmeter and a low power LF transmitter (I use a signal generator with an
amplifier)
The five scalar voltage readings can be simply converted to R +/-jX using
the DOS program located at http://web.ukonline.co.uk/g3ldo.


Regards,
Peter, G3LDO

<g3ldo@ukonline.co.uk>