[Antennas] SWR dipole

2002年9月07日 07:50:45 -0500

Thanx to all who responded. The antenna seems to work well, and I'll use 
it as a portable.
It has been pointed out that it is an end fed coaxial dipole and has 
been described by W2OZH in Aug 91 QST.
Heck, I thought I invented the thing. (Hi, Hi).
One last question, do vertical dipoles perform better as high as 
possible or closer to the ground??
> Thanks and 73's, Terry, WA�ITP 

-------------------------------------------------------------
Terry Fletcher wrote:
> Yesterday I put up a 20M half wave vertical dipole with a coax choke
> balun at the bottom end of the shield side. . It's 32' long and seems
> to work ok. The bottom end is off the ground about 15'. Good sig reports
> and it's 1.7:1 or less across the entire band. I don't seem to
> have any rf on the feed line, no way to tell.
> I wanted to use ferrite beads as a means of decoupling the shield (ala
> W2DU) from the bottom end of the dipole element. But I had some rg-8x on
> hand and there is no 73 series bead size to fit the OD of the coax, so I
> used the coil balun... . I may make another using rg-58 and fb-73-2401
> beads The idea was to have a bottom fed dipole, thats easy to roll
> up and store, and to use as a sloper or vertical, depending on tree
> size.
>> Here's my question. Does anyone know of a good way to test for rf on 
> the exterior of the
> feed line? A sensitive field strength meter perhaps?
> Thanks for any suggestions, and 73's, Terry, WA�ITP
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