Message-ID: <1645.200004121251@gemini>
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Organization: University of Hertfordshire
To: rsgb_lf_group@blacksheep.org
Date: Wed, 12 Apr 2000 13:52:23 +0000
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Subject: LF: Tuesday evening
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Dear Derek & Lech (I don't know if Lech has an E-mail address)

Thanks for an interesting evening at Puckeridge - It was good to 
meet up with yourselves and Mike, and also to play around with a 
'real man's antenna'! I'm sure the weekend will go quite smoothly, 
now the preliminary debugging has been done.

I don't think you have too much to worry about G3KEV's 
comments; the signal seemed pretty clean on my measuring 
receiver a few hundred yards away.

I dried out one of those small variometers and tested it at 100kHz 
on an HP4275 LCR meter at the university - L is variable between 
82 and 356uH, the equivalent series resistance stays pretty 
constant at around 0.6ohms. So it's just right for fine tuning a 
136kHz loading coil.

i spoke to Dave Lauder about your BT data line problem; he said 
he measured some rather large noise levels, and is going to E-mail 
you about his findings

I'll be in touch again before Friday - I'm still thinking about setting 
up a smaller antenna for comparisons.
Cheers, Jim Moritz
73 de M0BMU