A different
operating paradigm, but in the mid 80’s as G4EZG I once had a 160M
rhombic hung out over a valley…8 wavelengths of wire.
Feed at 120
ft… terminated apex, facing SW, at >250 feet on a catenary across
avalley.
I have no
doubt that AFTER the EXTENSIVE bonding (many miles/kM) of local
farmers’ wire fences resulted in a SIGNIFICANT performance
enhancement…quite empirical, never measured field strength - but then
regularly got accused of running illegal QRO and had some great
trans-Atlantic DX at times when it ‘should not’ have occurred.
Martin
VE7MM
From: WE0H Mike
Sent: Saturday, July
09, 2005 5:36 PM
To:
[email protected]
Subject: Re: LF: Re:
Mains Earth
Maybe roll out a few miles of
ground radials with the fence wire you buy at the farm store? I would
think if he laid down at least two or three full quarter wave radials
that the antenna current would go up. I think the wire costs $17.00 US
for a 2640 foot roll. It's gotta be better than nothing.
--
Mike
WE0H
WD2XGI
Alan Melia wrote:
Hi Joe if you look back to Jim's field strength measurements he found that
he got anomolous results when he was near overhead lines (power or
telephone) that ran away from is TX site. There is no doubt that these go
act as "guide" for RF, but we have all measured substantial reductions in
ground loss ( as measured by bridge) when the mains earth is included in the
grounding regime. (This does not work for everyone though) If this was the
case I would have expected your antenna current to increase when you connect
the mains earth.....strange.
Cheers de Alan G3NYK
----- Original Message -----
From: "Joe Craig"
To: <[email protected]>
Sent: 09 July 2005 12:50
Subject: LF: Mains Earth
Dear Group,
Thanks to Alan, Laurie and Wolf for their info on the mains earth.
At this station, there is one transmission line that runs in front
of the house and another about 1 km to the south that runs
roughly perpendicular to it so the mains earth grid is a bit sparse.
When doing mobile FS measurements, I noticed that the signals
were always stronger near the mains lines and suspected for a while that
the signals were being conducted along the lines rather than being
radiated. This was put to rest when Alan copied the sigs 2 years ago.
Thanks to G3AQC and Hartmut for the signal reports.
73
Joe
