18th October
2008
wonderer4711 asked:
a view shots of a selfmade 2,4Ghz WLAN Helix Antenna
25 Comments
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no its realy directed
true, you should use PVC/Plastic for the core of the boom.
The aluminium rod in the center kills the gain. Use a plastic boom instead or use a
plastic tube for the coil.
The aluminium acts like a short circuited ballast in the center of the coil. The magnetic field exists inside the wire loops, the electrical field remains outside.
Try to measure the gain.
You will be surprised how bad it is compared to the theoretical value for the number of turns you have got.
Directivity and impedance my be ok, but the gain is what matters.
GREATS ANTENA
what formula did you use to find the correct bandwith,length,and to set S.w.r.? how does this antenna do at side rejection?
OMG … you will catch the signal from the aliens with this Antenna (E.T phon home )xD
Thanks
The name of the music.Please.
It looks good, but you didn’t show us that it works.
is omni there is no parabolic dish on it to make it directional
No Its Not omnidirecional Its direcional They Are Big In the 2.4 Ghz Bands
it is omnidirecional???
wifi jedi lol
thats huge, not for wardriving then ? lol
thats pretty big for only 17dbi man. Nice antenna tho.
I think John Kraus was the man that make the first Helical Antenna
is very very good for receiver
and transmitter if you have a paravolic dish
very very good Idea for 2.4 and 5Ghz
but you may must have helical antenna to the AP right?
I think John Kraus was the man that make the first Helical Antenna
is very very good for receiver
and transmitter if you have a paravolic dish
very very good Idea for 2.4 and 5Ghz
but you may must have helical antenna to the AP right?
Awesome music!
ke distancia lograste?
please tell me the name of musik in this vid
Without an explanation it is far from helpful. Forget it.
It looks very beautiful - a work of art
I call anothers experts to put hear yours experiments, to tell us the tips how to build these…
I big gun! 73!!@
this came through a “normal” Construction (see at the bottom is a Thing we call in german “Endtopf” - see also “Rothammel Antennentechnik”).
like ve2zzz said, i don’t see any impedance transformer. care to explain how you manage it?
What’s the return loss of this antenna?
A helix requires either a 84 ohm ‘Q’ section (quarter wavelenth) mathing stub or a special construction (widened helix close to the ground plane) for the first quarter turn.