On 10/28/2021 2:23 PM, Ed Cole wrote:
I am redesigning my 40/80/160/630m antennas.
A year ago the tower I was supporting my 630m Invert-L was damaged by
wind and taken down. Replacement tower is shorter so not suitable end
wire support for HF antenna.
Hi Ed,
Take a look at the antennas on VK4YB's qrz page. My neighbor W6GJB
rigged a version of the first one that I tweaked in NEC to fit his real
estate and available trees. He's feeding directly with a simple LC
matching network that I designed in SimSmith based on measuring the
antenna feedpoint Z. If you've got the real estate and supports, it's a
great antenna for that band, because it's relatively efficient.
The antenna works VERY well, because it's end-loaded. Lengths are
tweaked so that the max current is in the vertical section. In addition
to tweaking those lengths, I also gave him the option of splitting the
end loading into two or three shorter wires running in different
directions. GJB has worked VK4YB several times; VK4YB and NO3M set a
630m record several years ago (which may be broken by now).
73, Jim K9YC
______________________________________________________________
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]
