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LF: AW: 0.5km with 1kHz 4W earth mode this evening

To: <[email protected]>
Subject: LF: AW: 0.5km with 1kHz 4W earth mode this evening
From: Stefan Schäfer <[email protected]>
Date: Fri, 28 May 2010 01:02:37 +0200
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Thread-topic: 0.5km with 1kHz 4W earth mode this evening
Sounds good Roger. You seem to be pretty motivated ;-) 
I hope i can transmit tomorrow out of 1,8km. Will report you also ;-)
 
73, Stefan/DK7FC

________________________________

Von: [email protected] im Auftrag von Roger Lapthorn
Gesendet: Do 27.05.2010 20:18
An: [email protected]
Betreff: LF: 0.5km with 1kHz 4W earth mode this evening


Today I made some more slight improvements to my loop and audio receiver and 
did a further walk test listening by ear. This time I managed to hear the 
signal just at 0.5kms. At 0.4kms it was a very solid signal. This was in the 
middle of a field well away from cables and pipe work. The TX is still the 
TDA2003 with 4W into the 20m spaced electrodes. At 0.4km where the signal was 
good still I tried placing the loop on the ground to see what happened. The 
signal was about the same level as when orientating the loop for best signal 
when held vertically. At the limit of range the limiting factor was 50Hz mains 
hum. I will try another Sallen-Key HPF in circuit to take this down another 
20-30dB, which should be enough.

I've a friend with a long back garden (no pipes or cables well away from the 
house) who is almost exactly 1km away from my QTH and he is in my best 
direction. As soon as I can (grandchridren permitting) I may take my laptop and 
set this up in his garden to look for the signal. I may also try 
listening/looking on electrode pairs too from the same location. 

There are so many things to try still but I just don't have enough time in the 
next week.

73s
Roger G3XBM

-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk <http://www.g3xbm.co.uk/> 
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G3XBM    GQRP 1678      ISWL G11088

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