Message-ID: <2000030600075668199@zetnet.co.uk>
Date: Mon, 6 Mar 2000 00:07:56 GMT
To: rsgb_lf_group@blacksheep.org
From: "Peter Dodd" <g3ldo@zetnet.co.uk>
Subject: LF: Re: LF
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Looked for I5TGC again on Saturday evening. His signal came up to a 
very good 'O' at 2030 and went down into the noise within 10 mins. 

Another expedition to Amberley Museum. Had a QSO with GI3PDN before 
getting down to the business of trying resonant radials. The antenna 
system comprises about 300m of antenna wire, a loading coil, a centre 
tuning variometer and a tuner variometer for a 250m radial.
The system will work but trying to get all these different tuning 
arrangements, plus the matching, is difficult. With the centre tuning 
system floating it can rise to quite a high RF voltage resulting in 
RF feedback and attacks on your fingers when you try to tune the 
thing. I dont think tuned radials is the way to go, well not in my case.
I did these tests high in the band and I trust I didn't QRM anyone 
doing QRSS that I couldn't hear.

At one stage I heard HB9DCE with a 569 signal working G3YXM. After 
their QSO I called HB9DCE and got a 449 report although by that time 
the signal was starting to fade. Also the RF feedback made the QSO a 
bit difficult.  This I found interesting because there is a lot of 
high ground to the south of the antenna, made up mainly of chalk. It 
seems fairly transparent to LF signals.

As regards 73kHz EU cross band QSOs, the first one I had  was on 
normal CW with F6CNI, my frequency 72.6kHz and the return frequency 
on 80m. This QSO was on 28/3/98 at 1845, my report 539. Distance 337km.

The second was 9/3/99 at 2000, with Toni HB9ASB. This was on QRSS 
73kHz/137kHz, 'O' both ways.

I will go to GWM radio in Worthing and see if I can get some crystals 
to modify my mixer/driver for 73kHz. 


-- 
Regards, Peter, G3LDO

<g3ldo@zetnet.co.uk>