Discussion:
Big fat retarded Mikey
(too old to reply)
Jim GM4DHJ ...
2023-03-10 14:19:53 UTC
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brian
2023-03-10 18:53:29 UTC
Permalink
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The video is running like an arthritic snail on a zimmer. Is that a big
wheel antenna he's testing ? What are his conclusions ?

Brian GM4DIJ
--
Brian Howie
jim.gm4dhj
2023-03-10 19:21:57 UTC
Permalink
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The  video is running like an arthritic snail on a zimmer. Is that a big
wheel antenna  he's testing ? What are his conclusions ?
Brian GM4DIJ
ask me not him he has is mounted verical what a diddy





brian
2023-03-11 13:27:29 UTC
Permalink
Post by jim.gm4dhj
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The  video is running like an arthritic snail on a zimmer. Is that a
big wheel antenna  he's testing ? What are his conclusions ?
Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms of
performance however they only have a fraction of a dB over a smaller
and cheaper halo.

Brian GM4DIJ
--
Brian Howie
Jim GM4DHJ ...
2023-03-11 15:22:57 UTC
Permalink
Post by brian
Post by jim.gm4dhj
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
 The  video is running like an arthritic snail on a zimmer. Is that a
big wheel antenna  he's testing ? What are his conclusions ?
 Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms of
performance however  they only have a  fraction of a dB over a smaller
and cheaper halo.
Brian GM4DIJ
how can it ... you are firing from three separate elements.so one will
be firing up one sideways and one down....
brian
2023-03-11 16:51:13 UTC
Permalink
Post by Jim GM4DHJ ...
Post by brian
Post by jim.gm4dhj
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
 The  video is running like an arthritic snail on a zimmer. Is that
big wheel antenna  he's testing ? What are his conclusions ?
 Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms
of performance however  they only have a  fraction of a dB over a
smaller and cheaper halo.
Brian GM4DIJ
how can it ... you are firing from three separate elements.so one will
be firing up one sideways and one down....
I think you're right. There's a bit of cancellation between the 3 bits
A horizontal big wheel has a deep null up and down in free space . A
halo has a much less deep null. So if you turn both through 90 degrees,
the null is horizontal - not so bad with the halo, so both are not
omnidirectional,with the halo winning . A further complication is the
height above ground . If you are unlucky most of the radiation goes
"up".

I don't think big wheels are meant to be used vertically.

What was he trying to do ? . I'll need to try the videos on another
browser. I'll mess around with the big wheel model,

Brian GM4DIJ
--
Brian Howie
brian h
2023-03-11 17:23:40 UTC
Permalink
Post by Jim GM4DHJ ...
Post by brian
Post by jim.gm4dhj
Post by brian
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The video is running like an arthritic snail on a zimmer. Is that
big wheel antenna he's testing ? What are his conclusions ?
Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms
of performance however they only have a fraction of a dB over a
smaller and cheaper halo.
Brian GM4DIJ
how can it ... you are firing from three separate elements.so one will
be firing up one sideways and one down....
I think you're right. There's a bit of cancellation between the 3 bits
A horizontal big wheel has a deep null up and down in free space . A
halo has a much less deep null. So if you turn both through 90 degrees,
the null is horizontal - not so bad with the halo, so both are not
omnidirectional,with the halo winning . A further complication is the
height above ground . If you are unlucky most of the radiation goes
"up".
I don't think big wheels are meant to be used vertically.
What was he trying to do ? . I'll need to try the videos on another
browser. I'll mess around with the big wheel model,
Brian GM4DIJ
--
Brian Howie
I got the videos to run. The first one was doubly slow.
This is G3CWI , an erstwhile user of ukra, testing one. I can't get 3dB gain out of any of the models unless wimo are using the ground gain trick



Brian
Ian Jackson
2023-03-11 19:57:48 UTC
Permalink
Post by brian h
Post by Jim GM4DHJ ...
Post by brian
Post by jim.gm4dhj
Post by brian
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The video is running like an arthritic snail on a zimmer. Is that
big wheel antenna he's testing ? What are his conclusions ?
Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms
of performance however they only have a fraction of a dB over a
smaller and cheaper halo.
Brian GM4DIJ
how can it ... you are firing from three separate elements.so one will
be firing up one sideways and one down....
I think you're right. There's a bit of cancellation between the 3 bits
A horizontal big wheel has a deep null up and down in free space . A
halo has a much less deep null. So if you turn both through 90 degrees,
the null is horizontal - not so bad with the halo, so both are not
omnidirectional,with the halo winning . A further complication is the
height above ground . If you are unlucky most of the radiation goes
"up".
I don't think big wheels are meant to be used vertically.
What was he trying to do ? . I'll need to try the videos on another
browser. I'll mess around with the big wheel model,
Brian GM4DIJ
--
Brian Howie
I got the videos to run. The first one was doubly slow.
This is G3CWI , an erstwhile user of ukra, testing one. I can't get 3dB
gain out of any of the models unless wimo are using the ground gain
trick
http://youtu.be/t61vw-K8zhc
IIRC, a 'simple' horizontal halo spews RF (with some degree of equality)
in all directions - not just horizontally (which is usually what you
want), but also up and down. Some time ago, someone sent me an RF field
diagram, but I can't find it at short notice.
--
Ian
Aims and ambitions are neither attainments nor achievements
brian
2023-03-12 09:05:40 UTC
Permalink
Post by Ian Jackson
Post by brian h
Post by Jim GM4DHJ ...
Post by brian
Post by jim.gm4dhj
Post by brian
Post by Jim GM4DHJ ...
http://youtu.be/JwTQXh0BZ5o
The video is running like an arthritic snail on a zimmer. Is that
big wheel antenna he's testing ? What are his conclusions ?
Brian GM4DIJ
ask me not him he has is mounted verical what a diddy
http://youtu.be/uY4Rd2YDz0Y
http://youtu.be/jlkUEAwGW9g
It will work vertically and will still be omnidirectional . In terms
of performance however they only have a fraction of a dB over a
smaller and cheaper halo.
Brian GM4DIJ
how can it ... you are firing from three separate elements.so one will
be firing up one sideways and one down....
I think you're right. There's a bit of cancellation between the 3 bits
A horizontal big wheel has a deep null up and down in free space . A
halo has a much less deep null. So if you turn both through 90 degrees,
the null is horizontal - not so bad with the halo, so both are not
omnidirectional,with the halo winning . A further complication is the
height above ground . If you are unlucky most of the radiation goes
"up".
I don't think big wheels are meant to be used vertically.
What was he trying to do ? . I'll need to try the videos on another
browser. I'll mess around with the big wheel model,
Brian GM4DIJ
--
Brian Howie
I got the videos to run. The first one was doubly slow.
This is G3CWI , an erstwhile user of ukra, testing one. I can't get
3dB gain out of any of the models unless wimo are using the ground
gain trick
http://youtu.be/t61vw-K8zhc
IIRC, a 'simple' horizontal halo spews RF (with some degree of
equality) in all directions - not just horizontally (which is usually
what you want), but also up and down. Some time ago, someone sent me an
RF field diagram, but I can't find it at short notice.
Here's what I get.
Loading Image...
Loading Image...

The big wheel is more omnidirectional than the halo. I've seen places
where the halo is vertical and more uniform, but there's more up an
down as you say and less to the side.

I still can't get 3dB over a dipole for a big wheel unless I add in
ground gain, but then the dipole also has ground gain

Loading Image...
Loading Image...

I'd been looking at using a bigwheel on 6m at home, attracted by the
claimed 3dbD gain , but ended up using a delta loop for the few times I
use the band.

Brian GM4DIJ
--
Brian Howie
Loading...