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Reply | Forward Message #41 of 141 |
Re: Helix antennas

--
> I put my work on the net so amatuers could play with it, but Americans
> take the position that "all is known about antennas and want to buy
> instead of making things. It would be neat to hear some G's on top
> band despite the difficulties.
> Cheers and beers ( brown ale will do)
> Art Unwin KB9MZ.....xg
> Stepney
>

OK Art,

I will take a crack at building up one.

The flatness of the SWR curve concerns me since
you have close to a radiating dummy load unless
you are dependent on the feedline to do the
radiating. The last several small antennas have
this common problem and when fitted with a proper
isolation balun at the antenna feedpoint to
seperate common mode radiation from the feedline
to the antenna, the antennas were nothing close
to their claimed performance. Would you please
address this issue?

73....Walter - K5EST




Wed Jun 11, 2008 3:40 am

k5est
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Message #41 of 141 |
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Hi, I just put up a page on helix style antennas, well contra wound antennas tightly wound up and then down using pre twisted wire so that power goes up and...
ahunwin
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Jun 11, 2008
1:12 am

-- ... OK Art, I will take a crack at building up one. The flatness of the SWR curve concerns me since you have close to a radiating dummy load unless you are...
k5est
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Jun 11, 2008
3:40 am
ahunwin
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Jun 15, 2008
3:31 pm

... Walter The antenna is in equilibrium so there is no radiation from the line. You can check this out with a optimizer program by obtaining a std helix...
ahunwin
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Jun 15, 2008
3:49 pm

... ............... Tnx Art, for the reply. I do have spare telephone wire (4 conductor in a sheath). Have to prepare the wire. Good luck on the Top Band...
k5est
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Jun 15, 2008
4:44 pm

... What ever you do don't leave the wire in the sheaf. Cut the wire in pairs say 25 feet and pre twist them. Shame the G,s just wind the wire in one...
ahunwin
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Jun 15, 2008
7:47 pm

... Get a 404 page not found here :(...
Andy Doswell
andydoswell
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Jun 11, 2008
6:42 pm
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