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FREE Access to article. After a discussion with the antenneX publisher, he has published my article in the FREE access section. http://download.antennex.com/listarch/files/searchlight.pdf A couple of comments re recent questions. Re efficiency: For ME, an inefficient antenna is BAD...

Re-think your re-thinking. The important number is the SWR. The lower the better. It doesn't matter whether the R is Higher or the X is Higher. It's the combination that is important. Bill

After I finished my design, I came across a very thoughtful design for an open sleeve antenna. It was designed to solve the assymetrical pattern problems of a J pole. As such, it's roughly 1/2 wave plus 1/4 wave high. That's MUCH taller than my design. And the paper on that subject...

Hi Doc.... You are on the right track with your thinking WRT the metal cylinder. It is a short section of coaxial transmission line with a Zo of around 160 Ohms. Using EZNEC, I've modeled this device as an assymetrical sleeve dipole (source at the center) AND as an end fed device. The...

Hello Doc... The antenna is easily modeled in EZNEC. When I built the first one, I had to make just a small (~3%) adjustment in the overall length vs. the modeled length to get it to resonate. That was almost certainly due to a variation in wire size vs. the model. The major difference was...

Hi Eddie... The article is copyrighted, so I can't send a copy. Each month, SOME of the articles are available as "freebies." Most are not. Since I'm a long-time subscriber, they all come free to me! Another approach might be to contact the publisher, Jack Stone and ask him. The worst that...

Article On This Antenna The December issue of antenneX, the online antenna magazine, has just been published. It features my article describing this antenna in greater detail. 73, Bill KT4YE

Here's How To Build One 1. Fiberglass pole approx. 15'7" tall, with base 1 3/8" diameter. (The LDG S9v18 is what I used.) 2. Run a piece of stranded, insulated #10 wire inside the tube from top to bottom. Leave about 6" to connect to a 1:1 current balun. (LDG supplies a free one with every...

Yes... It sure looks the same. And yes, there is good info there. Bill

End Fed Resource This month's issue of antenneX, the on-line antenna magazine, has an interesting article on end-feeding 1/2 wave antennas. The author developed a technique for feeding the 1/2 wave antenna using a tuned transformer. One side of the secondary is the 1/2 wave "monopole." the...

I've used the S9 clamps. I also lost several when I forgot to take them off before collapsing my S9V18. They popped off "somewhere." Pattern distortion will be minimal. Be careful not to over-tighten the hose clamp, or you can CRUSH the fiberglass. (maybe wrap the antenna with a thin piece of...

Big Stick Insides Does anyone know what's inside? I've looked for a block diagram or schematic with -- so far -- no luck.

I asked you what/where in the antenna literature. You responded with the table of contents. Oh... Yes... I understand now. That was the ROYAL we, wasn't it? Hmmm... I suggested that others could determine my expertise by looking at what I said. I also said that anyone that cared to...

Thanks for the reply, wavrider... This thread is on broadband antennas for 10-11 M. The R8 NOT R8000) is not a broadband antenna. It is a multiband antenna that lists for about $550. Sorry, but this item is OT. No need to be insulting by telling me to look at the table of contents of an...

Nope. See EZNEC plots. See the last diagram. It's for 1/4 wave monopole over std ground with 8 radials. Gain -0.31dBi at about 26 degrees. See the first diagram for my design over std ground. No radials. Gain = 1.13 dBi at about 18 degrees. (lower is better) I own quite a few. Would...

See attached photos... Height above ground approx 20'. Based on a LDG S9 telescoping 18' (actually 17'8") standard fiberglass antenna with included 1:1 balun. Telescoped to about 14.5 ft. Mounted on a Radio Shack tripod with a 5' Home Depot wooden shovel handle. Added cost: 3 additional...

Someone asked, "I am actually curious as to the goals the op is attempting to achieve with this thread. Why do we need a 6Mhz bandwidth at HF frequencies?" Here are a few: 1. At this bandwidth, you have both an 11M and 10M antenna. Saves money for the manufacturer AND for those ops that...

"Reasonable" as in about a 2:1 VSWR?

That's why I'm asking the question. I want to know what the benchmark is. 4 MHz 2:1 bandwidth at, say, 28 MHz is about 14%. But if that same technique is applied to, say 3.725 MHz, then that's 520 KHz... and THAT is enough to cover the entire 80M band! Yep. Complex and also requires a very...