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Von: Roger Lapthorn <rogerlapthorn@gmail.com>
Gesende= t: 05.06.2010 21:49:29
An: rsgb_lf_group@blacksheep.orgBetreff: LF: 1.5kHz earth-mode update

Attached is a= map showing the coverage around the village using 4W TX to a 20m baseline= earth electrode pair receiving on an 80cm 30t loop.

Green dot= s show signal received
Orange dots show signal just copied (limit of= range)
Red dots show no signal copied (either too weak or buried un= der 50Hz fog)

As mentioned yesterday, I tried to receive the si= gnal (by ear only at this stage) at various places around the TX out to ab= out 0.8km but maximum range across open fields was 0.5km. In the village= itself coverage was solid due to conduction of the signal through metal= water pipes out to about 0.25km in most directions. Across the open field= s reception was by pure induction judging by the loop direction. At some= test points the signal was buried in 50Hz "fog" despite quite good active= high pass filtering and copy was impossible.

These results do= suggest that this TX/RX system is capable of greater than 1km despite the= 4W low power if using QRSS and a PC receiver. This I shall confirm after= my grandson goes back home to London in about 7 days's time and I get my= shack back. Further distances will then depend on more power, better elec= trode spacings, possibly a large loop at the TX end, or even a Marconi ant= enna as the German stations have been trying.

Despite Mal's con= cerns there is now a "head of momentum" building in sub-9kHz experimentati= on, whether looking for super-DX by true radiation or more limited testing= by induction and conduction. It is all fascinating stuff and quite possib= le to do with very modest test equipment and gear.

73s
Rog= er G3XBM

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