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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