Hi Warren
I would say any experiments on 2200m are impressive. Sandy is
sharing with us something neither of use or many others have tried.
No matter the results the experiment itself is impressive and
interesting.
I wish more would take the time to slog around in the mug to put a
signal on the band, no matter how.
73 Scott
VE7TIL CN89dk
http://www3.telus.net/sthed/argo/
On 9/28/2010 12:34 AM, Warren Ziegler wrote:
Sandy,
These results are not very impressive!
I have done much better than that with either a top loaded
80' vertical or a transmit loop!
Also, it is hard to see how an LF antenna could favor
skywave over groundwave!
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Mon, Sep 27, 2010 at 8:20 PM, Nan
and Sandy Sanders <[email protected]>
wrote:
Hi all. About 8 or 9 years ago AMRAD installed what we
called an earth bipole. From our web page http://www.amrad.org/projects/lf/
"AMRAD has built a 1500 foot long bipole antenna. This is a
wire that goes through the woods and is connected on one end
to a 300 foot steel well casing and a ground rod in lake on
the other. It is tuned to resonance with two large coils
near the ends and a ferrite toroid transformer gets it all
to 50 ohms for the transmitter. Initially it was not strong
back here in the Washington DC area. But now it looks like
the signal is pretty good further out. It may favor sky wave
to ground wave. Recent results have been good with reception
into London, Ontario Canada by Mitch Powell VE3OT. His
zipped .wav file can be downloaded <http://www.amrad.org/projects/lf/wa2.zip>here.
Note that it is almost 750k. This reception is about 324
miles or 521 km. Closer in we have reception confirmed from
Steve Dove W3EEE/G3YDV at Mt. Gretna PA. "
Note: here= http://www.amrad.org/projects/lf/wa2.zip
The wire was attached to trees about 15 feet off the ground
and it was fed about 100w and keyed at 5 wpm. We always had
problems getting people to listen for us outside the local
area. We lost interest after our FCC would not give us
137Khz as an amateur band.
One thing I learned during the installation of this antenna
is that if you step into waist deep mud and cannot get your
self out, your fellow amateurs will laugh and take photos of
you before they will help you get out.
I think that AMRADs and Stefan's experience show that this
type of antenna is worth some investigation.
Sandy
WB5MMB
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