Hi Dave,
My first thought is an artificial noise floor from some device at your
location. How much S meter difference between antenna off and antenna
connected ?
Do you have battery power for your transceiver available for a test ?
73,
Bruce-K1FZ
----- Original Message -----
From: "Dave" <davek4sv@yahoo.com>
To: <topband@contesting.com>
Sent: Sunday, February 10, 2013 1:05 AM
Subject: Topband: Soliciting suggestions on our receive antennas for 5X8C
Hi All,
My team is currently on DXpedition to Uganda 5X8C
We have erected receive antennas here in 5X with very poor success. W e
have used the same antennas at other places with great success. Please
read below and if you can offer some constructive suggestions please reply
to me and copy reflector. Davek4sv@yahoo.com
We are experiencing some weird problems with our receive antennas. We
have a beverage about 540 feet long, terminated properly about 5 to 6 feet
over the ground. I have built plenty of these at my house, they all work.
This one here does not. It hears noise but no signals. Once In a while
you can hears signals.
So put you're receive antenna hat on. We suspect the ground is the
problem. We are located on the shore of Victoria Lake at a resort. The
soil appears to be sandy but with fresh water lake nearby. 200 feet. The
beverage is in the clear away from large metal objects.
With a 510 ohm termination we measure about 235 ohms when looking across
the termination resistor. Using resistor theory essentially we have two
resistances in parallel. The wire , termination transformer, ground rods
and ground are about 500 ohms. Having not measured this at home I'm not
sure if this is too low or too high of resistance.
We erected a Flag 29x14 feet mounted just above the ground. This is
purported to be ground independent. Our tests last night indicate this
antenna is not hearing very well either.
We are soliciting suggestions. We only have a small amount of wire and
other antenna stuff, no Home Depot or Radio Shack around. Perhaps we can
build a ground independent antenna that does not care what it sits on.
We have or can source some wooden poles to make wire radiators.
The 5X8C team thanks you in I
Thank You in Advance,
Dave Anderson, 5X/K4SV
Sent from my iPad in Uganda
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Topband Reflector
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Topband Reflector
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