rec.radio.amateur.antenna Google Group

Re: J pole question

2010-03-17T03:06:28Z

Sure leave it off altogether and hang it with fishing line.
Jimmie

Re: Art's quiet mesh antenna

2010-03-17T01:51:19Z

tom wrote:
Well, I guess "Mister Master Antenna Designer" knows exactly how well
his antennas work.
Just as I expected.
tom
K0TAR

Re: J pole question

2010-03-17T01:21:30Z

ai8o <a...@lexcominc.net> wrote in news:1bcefed7-a087-4fda-976d-
727ab6297...@l11g2000pro.googl egroups.com:
The support leg doesn't carry substantial RF currents, so by itself it
doesn't play a big role in the antenna.
I believe that its length is intended to help keep the
current-carrying portions of the antenna (the two-arm roughly-

Re: J pole question

2010-03-16T23:53:35Z

ai8o <a...@lexcominc.net> wrote in news:1bcefed7-a087-4fda-976d-
727ab6297...@l11g2000pro.googl egroups.com:
End fed antennas are an implementation risk.
Have you considered a vertical dipole hung from the roof structure, and
taking the feedline away horizontally for a couple of wavelengths, then
down. You could make it a folded dipole (TV ribbon?) and use a half wave

Re: J pole question

2010-03-16T22:23:55Z

course you can, make it from 300 ohm ribbon feeder & hang it via the top, I
did that with a slim jim which may be better than a j pole, just google slim
jim for 2 m if you don' recognise it

J pole question

2010-03-16T21:57:57Z

I am thinking of making a 2 meter J-Pole from 3/4 or 5/8 copper pipe.
Most plans that I can find on the web call for a 58 inch main leg and
a 20 inch support below, making the antenna
78 inches or so in height.
I want to install it in my attic where I have 66 inches of clear
space.
Can I cut the lower support leg down to 8 inches without a major

Re: Art's quiet mesh antenna

2010-03-16T20:59:33Z

There is too much consistency to Art's rantings for him to be the
senile old man he pretends to be. More and more I think he is a troll.
My guess is someone from the CB newsgroup that often x-posts here. If
I am wrong I sincerely apologize to Art for I know I could through a
blot clot and be the next person with nothing better to do all day

Re: Stealth Hex Beam

2010-03-16T19:44:15Z

On Mar 16, 1:51 pm, "Eternal September Newsgroups"
IMO, it is much easier to make a stealth vertically polarized phased
array than try to do it with horizontal elements. Two or three
flagpoles come to mind.

Stealth Hex Beam

2010-03-16T18:51:14Z

I'd like to make a steal hex beam antenna for 17 and 15 meters, maybe even
20 meters. My goal is to make it is invisible as possible. Is there any
ideas of what type of support poles that would be the lightest? Maybe
croppy fishing poles? I'm even thinking of putting this antenna up when I
use and and then bring it down in between days when I do not operate.

Re: Alliance Tenna-Rotor for sale

2010-03-16T16:55:19Z

And I have a lovely bunch of coconuts. 8^)
- 73 de Mike N3LI -

Re: Art's quiet mesh antenna

2010-03-16T06:30:02Z

What is amazing is that you can use incorrect information
to describe a patent, and no one seems to notice or care.
Such as this vital tidbit of information...
Quote from United States Patent 5,625,367
"To increase the directivity of such an antenna, a parasitic
reflector element, usually tuned to a frequency slightly higher

Re: Art's quiet mesh antenna

2010-03-16T05:34:57Z

Ah, jeeze, this is going over old groung:
[link]

Re: Art's quiet mesh antenna

2010-03-16T05:06:33Z

There is an amazing difference between the writing here:
[link]
and the bafflegab we have been getting recently..

Re: Art's quiet mesh antenna

2010-03-16T04:57:00Z

[link]

Re: Lossy Coax: how is energy lost ?

2010-03-16T02:14:23Z

(Excellent summary and explanations!)
> . . .
What a lot of people miss is that this is the real reason open wire line
is less lossy than coax -- it inherently has higher characteristic
impedance than coax because of its geometry. (The I^2*R loss is lower
for high impedance lines because I is lower for a given power level.)