Emory,
First off receiving a station at 597km (370mi) is not a bad distance
on 474 KHz. Most propagation is ground wave which does not extend as
far as HF. Best propagation is in winter and at night when a little
sky wave is seen.
Where have you searched for antenna info? Try this:
http://www.500kc.com/
Most on 160m and 600m know that vertical antennas work best. Your
double length G5RV probably is something like 30 or 40 feet
high. That is equivalent to hanging a 10-foot long dipole 1-foot off
the ground for 20m. Short horizontal antennas do not work well on 600m.
True that a full size 1/4 wave is a little high (492-feet) so you are
stuck with very short antennas which have very low impedance until
you use a top hat and loading coil. Short antennas are capacitive so
a big loading coil at the ground end connected to a ground rod is a
common solution. Top hats also make the antenna appear
longer. Inverted-L and Marconi-T are two typed of loaded vertical
antennas. Typical antenna for non-directional beacons running
300-500 KHz are about 300-foot long and 60-foot above ground with a
single vertical wire from the mid-point down the beacon transmitter
sitting on ground. My inverted-L is only 43-foot high and 122-foot
long on top. I have a large base coil at the ground end 10-inch
diameter 11-inches long with 1/4 inch winding spacing. I tap the
coil two turns above the ground end to feed coax to the shack. My
antenna efficiency is less than 1% because of its size.
For receiving there are magnetic loops, pendants (triangular loops),
and beverage antennas (if you have some acreage).
The farthest I have copied signals is Buffalo, NY which is over 4000
mi. But that is the exception. Normal day-to-day range is out to
300mi using ground wave.
I can't really tell you much in a paragraph or two. You can join a
600m e-mail list at the above website if you are really interested in 600m.
73, Ed - KL7UW, WD2XSH/45
Date: Sun, 22 Feb 2015 18:37:13 -0500
From: <[email protected]>
To: <[email protected]>
Subject: [Elecraft] K3 receive on .474.2 kHz
Message-ID: <DB8C4DBB35F44F3BB99C3E532D258663@ejhPC>
Content-Type: text/plain; charset="iso-8859-1"
After the install of the new KSYN3A synthesizer board, I tried WSPR
on 474.2 KHz, using double size G5RV for receive.
I am able to copy WG2XKA using WSPR, at 597 km.
I did some web searching for antennas, only thing I found were 160 ft
verticals, not an option for me.
Anyone know of a wire antenna or something easier to put up? thanks and 73
Emory WM3M
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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