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From: "mal" <g3kevmal@talktalk.net>
To: "rsgb" <rsgb_lf_group@blacksheep.org>
Date: Fri, 21 Dec 2007 14:58:06 -0000
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Subject: LF: TECH INFO
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Tech info G3KEV/IO94SH
Antennas

RX setup.
Vertical  rectangular  loop 600 feet perimiter abt 80 ft high at top and 7
feet at bottom above ground resonated on 500 khz band, EAST/WEST.
or alternative
1/4 wave inv L for 500 khz, 100 ft vertical and rest horizontal also used
for Transmitting, 50 ohm matching unit at base of vertical.
 Each antenna selectable and fed via 50ohm coax to a Datong UC/1 upconverter
(has preselector)and two IF outputs 144 or 28 mhz. I use the 144 mhz output
to a Icom 746 transceiver. The two outputs can be used at the same time if
required to separate receivers.

I have a small Wellbrook 1m diameter circular loop, which has a preamp and
that works well but well down on the big antennas, sig/noise is good
I have other receivers also suitable for LF/MF if required.

The 136 khz antenna consists of 3 x inv L spaced around a tower at 100 ft
high, all vertical leads joined at the bottom to a matching atu for 50 ohms

For 160m the antenna at present is a one wave inv L up at 100ft

Total of 3 masts in use at this qth, plus high trees around the perimiter of
the field.

de G3KEV/IO94SH