Bobtail curtain / half square ?s
 

Would like to hear from (or see) anyone who has built a bobtail curtain
or half square. I'm interested in your construction techniques.

TNX

Richard / N5YPJ

On Thu, 20 Nov 2003 01:42:41 GMT, Richard
wrote:

Would like to hear from (or see) anyone who has built a bobtail curtain
or half square. I'm interested in your construction techniques.

TNX

Richard / N5YPJ


Hi Richard,

I buitl a bobtail a lot of years ago for Forty meters worked great..
but then I was on an island surround by salt water.. what is it your
asking?

Construction was fairly straight forward.. 1/4 wave vertical sections
sperated by Halfwave horizotal sections mine was fed throut a tanks
circut at the center element.

73 Dave

Hi,

http://www.cebik.com
many antenna plans, including the bobtail and half squares.
He also has the eznec antenna graphs. All at no charge !

I've built half squares for 2m not hf.

73 clark

Richard wrote:

Would like to hear from (or see) anyone who has built a bobtail curtain
or half square. I'm interested in your construction techniques.

TNX

Richard / N5YPJ

Hello Rick,

I have built and used half-squares on the 40m band for many years.
I'm very happy with their performance, for a wire antenna that isn't
rotatable, on that band. I feed mine at one of the top corners
directly with 50 ohm coax and the match is pretty good without needing
much trimming at all to make it work in the desired part of the band.

I put the ends of the vertical sections at least 10 feet off the
ground, not only for safety - so no one can touch it while I'm
transmitting - but from what I've read, it lowers the take-off angle
somewhat and results in longer path DX. If I had the room I'd build
one for 80m as well!!

Check out http://www.cebik.com/scv4.html for details.

I'd be glad to answer any questions - juste-mail me directly.

73 and GUD LUK de Bob KB1LN

Using Bobtails since 1984 and only on 40m.
Easy to build and tune, cheap compared to Yagis

You can have a pick on www.f6dxe.com (the site is in french but the pictures speak for themself)

At the moment 2 Bobtails are ready, I am building the third one.
They are all in the triangle made out of fiberglass pols.
This will allow 6 main directions.

Next month experiment will be to fire 2 bobtail at the same time using the triangle configuration, meaning that two bobtails along the same corner angle will be feed. This should result of a better concentration of the lob in one direction only.

73's
Dick (Didier) F6DXE