On 8/6/2019 7:00 PM, Mike Lichtman via Elecraft wrote:
All thoughts are appreciated. The antenna itself has worked fine for me on all
bands (80 thru 10)
You should buy yourself a copy of the ARRL Antenna Book and learn about
how to build your own antennas.
That tube contains a lot of little ferrite beads that act as a common
mode choke. This form of choke was developed many years ago by W2DU (now
SK). If you haven't already fried it by running 500W you probably will
eventually.
If your QTH allows more than one antenna, I strongly recommend the use
of resonant fan dipoles fed with coax. They are very easy to build. If
you do that, you can build your own common mode choke that is far
superior to the one you bought with the antenna. 80 and 40 M makes a
good combination for a fan, and the 40M element will work on 15M. If
you're limited to 100 ft or so, consider one of the loaded 2-band
dipoles built by Hypower Antenna Company (a ham in his basement), or buy
the loading coils and build your own. I used one of his 80/40 loaded
dipoles in Chicago. It also worked on 30 and 17. A 20M dipole is only 33
ft long, so it's pretty easy to rig almost anywhere. I wouldn't worry
about 15, 12, or 10M for the next 4-5 years, because they're nearly dead
as we approach the bottom of the current solar cycle.
There are several "how to" tutorials on my website, k9yc.com/publish.htm
, including one that describes how to build fan dipoles from inexpensive
and readily available parts. My guidelines for chokes is at
http://k9yc.com/2018Cookbook.pdf
73, Jim K9YC
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