Originally, I was looking to hang a half-square on 80m as accidently
ended up with two 50-foot towers spaced 130-foot apart. But then
around 2011, I got interested and joined the ARRL 600m Experimental
Group and was looking at 600m antennas. With just under 2-acres
(200x300 foot). there was just not enough horizontal room for an LF antenna.
Revising my plans I made a 43x122 foot inverted-L. I tripled the
vertical wires and doubled the horizontal wires to get a bit more
bandwidth (5-KHz at 495-KHz). I laid out three radials on the ground
using 2-foot wide chicken wire and fourth radial was shield of my
120-foot run of 1-5/8 inch Heliax to the tower holding the vertical
section. All much shorter than 1/4 WL.
<http://www.kl7uw.com/630m.htm>http://www.kl7uw.com/630m.htm
Efficiency at 475-KHz is terrible (4%) with such a short vertical but
it hears well using basically ground-wave prop out to
1100-miles. I've copied Rudy-N6LF several times over much longer
path into Oregon from AK (1647 miles).
I tried a BOG but though a lot quieter also signals were much less
(500-foot not long enough to work well as a Beverage on 600m)
With some changes on my base loading coil the invert-L could be used
on 160m (maybe some day??).
Sidenote to 6m ops: My dual 7-element LFA yagi array is functional
for FT8 (Es) or JT65 (eme) or MSK-144 (ms); will have 1000w QRV in
few more days (after testing).
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
