On 7 Dec 2006 20:27:37 -0800, "
wrote:

Actually, maybe it doesn't have gain compared to a halo... I'm not
really sure... I have an inconclusive 6m Big Wheel EZNEC model with an
average gain problem... though at this point it's only showing a -0.5dB
average gain or so, and impedance and gain seem constant with
segmentation changes, so it's probably not so bad.

I made it back when I was considering building one and modified it a
little bit to make the avg. gain work out better.

Anyway, if anyone wants to try to get it to work reliably, there's a
model at

http://www.n3ox.net/projects/eznec/6mBigWheel.ez

Dan,

I changed your segmentation, W1=1, W8-W43=1, I get average
gain=0.05dB.

Are you sure that W1 should be 15"? That and the spacing of each pair
of conductors out the the ring gaps are going have a large influence
on feedpoint Z. Did you scale this from another frequency?

Owen

--

I changed your segmentation, W1=1, W8-W43=1, I get average
gain=0.05dB.


I used your segmentation and changed the spacing of the transmission
line sections to both 1 inch and 1.5 inches to be more realistic and
played with the transmission line segmentation and can't get better
than -1dB average gain with zero loss in free space.

What should I do

wrote in message
ups.com...
Actually, maybe it doesn't have gain compared to a halo... I'm not
really sure... I have an inconclusive 6m Big Wheel EZNEC model with an
average gain problem... though at this point it's only showing a -0.5dB
average gain or so, and impedance and gain seem constant with
segmentation changes, so it's probably not so bad.

I made it back when I was considering building one and modified it a
little bit to make the avg. gain work out better.

Anyway, if anyone wants to try to get it to work reliably, there's a
model at

http://www.n3ox.net/projects/eznec/6mBigWheel.ez

Dan

Hi Dan

I made a model of two Turnstiles (crossed 1/2 wave dipoles) stacked, one
above the other. EZNEC shows 2.9 dBi gain at the horizon with free space
conditions. The individual dipoles have input impedance of about 68 -J
10.
It seems that two turnstiles, stacked vertically might be a decent choice
for a omniazimuth horizontally polarized 2 meter antenna.

Jerry

try these sites:

http://home.tiscalinet.de/wimodata/wheel.pdf

http://www.hb9cru.ch/UKW/Rundstrahl.htm

http://www.mr-as.de/dg2mas/Homepage%20DG2MAS.html

http://members.fortunecity.com/xe1be...rs-antenna.htm

http://www.kb4oid.org/2mssb.php?PHPS...835bd7f5ba 59

http://www.qsl.net/dl4mea/

http://www.k0nr.com/rwitte/rover.html

"Tom Ring" wrote in message
.. .

I've done a fair bit of googling, and haven't found a decent set of plans
to construct a 2m Big Wheel. I have found the original article from 1961,
but the resolution in the pdf is lousy.

Anyone have a link?

tom
K0TAR

Also, was a staple in the ARRL Radio Amateur's
VHF Manual c. 1972 (pgs 198-199) . These were
pretty common in two meter A.M. days, and stacked
pairs worked pretty fair, considering they were
Omni-Directional. Jim NN7K

John Doe wrote:

"Tom Ring" wrote in message
.. .
I've done a fair bit of googling, and haven't found a decent set of plans
to construct a 2m Big Wheel. I have found the original article from 1961,
but the resolution in the pdf is lousy.

Anyone have a link?

tom
K0TAR

I had already checked the index in my oldest ARRL Antenna Book, circa
1974, and nothing in there. Argh.

I sure wish I had a copy of the 1972 VHF Manual. Our Northern Lights RC
monthly breakfast is in about an hour, I'll check there and see if
anyone has that manual. It's a good bet since W0AUS, the blazing core
of our 10 GHz SSB/CW group, has probably been a ham for over 60 years.

Thanks for the tip.

tom
K0TAR

Jim - NN7K wrote:

Also, was a staple in the ARRL Radio Amateur's
VHF Manual c. 1972 (pgs 198-199) . These were
pretty common in two meter A.M. days, and stacked
pairs worked pretty fair, considering they were
Omni-Directional. Jim NN7K

John Doe wrote:


"Tom Ring" wrote in message
.. .

I've done a fair bit of googling, and haven't found a decent set of
plans to construct a 2m Big Wheel. I have found the original article
from 1961, but the resolution in the pdf is lousy.

Anyone have a link?

tom
K0TAR

Tom Ring wrote:
I sure wish I had a copy of the 1972 VHF Manual.

Tom, I've got that one. Big Wheel is on page 198.
What do you need to know?
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:

Tom Ring wrote:

I sure wish I had a copy of the 1972 VHF Manual.


Tom, I've got that one. Big Wheel is on page 198.
What do you need to know?

I'd like a copy of those pages if you could have the ability of scanning
them.

Thanks.

tom
K0TAR