Message-ID: <3B5351E5.C2E4D1DF@netscapeonline.co.uk>
Date: Mon, 16 Jul 2001 21:43:17 +0100
From: "gii3kev" <gii3kev@netscapeonline.co.uk>
Organization: Netscape Online member
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To: "rsgb rsgb" <rsgb_lf_group@blacksheep.org>
Subject: LF: 9 khz antennas
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Hi All
Although wires lying on the ground and using the earth spiked in a
mumber of places has been tried on the higher LF freqs 73 and 136 khz
and found to be useless this approach would probably work after a
fashion on 9 khz and probably better than trying to load a vertical a
few metres high with all the associated high voltages if trying to run
moderate power out of a few hundred watts.
One approach could be to use farmers electric fencing techniques, small
low stakes anything from a few inches to a couple of feet high above
ground with appropriate insulators at the top of the stakes and use
insulated copper wire as well for double insulation. Position as many
stakes/rods as possible around the garden, field, or along the road side
grass verge and run out as much wire as possible.
Keep the wire taught and off the ground and use as the antenna fed
against a few spikes driven into the ground and interconnected.
It still does not make a good long haul antenna but at this frequency
anything is worth trying.
If you make the antenna system too efficient at this frequency think of
all the qrm to all the HIFI/Stereo listeners in your area.
Use your dog as a receiver their ears will resonate at this frequency,
causing them to bark synchronised with your cw. Check the near field
with your own dog and the far field with the neighbours dog a mile or
two down the road!!!!!!!!!!!
73 de G3KEV