On 11/14/2014 3:49 PM, Ralph Mowery wrote:
"Jerry Stuckle" wrote in message
...
On 11/14/2014 12:34 PM, wrote:
You ignore the fact this is an idealized environment. That is NEVER the
case in a real installation.
I have WAS on 75 SSB (from Iowa) with an inverted Vee. The top was only
50' in the air. And late at night in the wintertime I had pretty solid
communications over much of the continental U.S. (back in the late 70's
and early 80's).
Antennas NEVER work "as predicted" - and anyone who claims they do does
not understand antenna operation.
Antennas 'always' work as predicted. People just don't always factor in
everything in the prediction. Just as I worked a station on 432 MHz with 25
watts to a 1/4 wave ground plane that was about 1000 miles away. Nice bit
of tropo that day.
The problem is - taking into consideration EVERYTHING which could affect
it. Well nigh impossible - even the neighbor's chain link fence could
have an effect, for instance. That's why AM commercial radio stations
plan their antenna phasing for the desired pattern - but then have to
measure it almost always tweak the delay lines to get the exact shape
they want.
For instance - I remember one I worked at back in the 70's. It's
pattern was directly affected by moisture in the air and, to a certain
effect, ground. You could see the difference in tuning for the
transmitters between a very foggy night and a clear one. This also
caused a change in the radiated pattern. Fortunately it was still with
the limits set by the FCC, or we'd have to rephase the towers with every
change to the weather. BTW - the main cause was the ground plane
(circles of wires around each tower with radials from the tower out -
and silver soldered where ever the wires crossed) was pretty old, and
subject to changing weather conditions.
I bet I could put up a g5rv at 30 feet on some rare country and get loads of
5/9 signals no mater how many times the calls had to be repeatd.
I highly suspect you could!
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Jerry, AI0K
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