[Antennas] Mini Yagis using Coax

Sun Nov 5 12:23:02 EST 2006

Well, if it's multipath interference, the Moxon is for you! It has a front
to back ratio of up to 30dB. No Yagi can beat that! And, besides, it HAS
something like 6dB gain.
Alex 	4Z5KS
Alex Eban
alexeban at gmail.com
 050-7774300
 03-9067913
-----Original Message-----
From: antennas-bounces at mailman.qth.net
[mailto:antennas-bounces at mailman.qth.net] On Behalf Of Ed Griffin
Sent: Sunday, November 05, 2006 4:26 PM
To: Richard Greaney
Cc: antennas at mailman.qth.net
Subject: Re: [Antennas] Mini Yagis using Coax
Something else you may want to try, that is simple to build, is a 
Hentenna. The Hentenna will have the same pattern as a dipole, but will 
have gain. Keep in mind that this antenna will be horizontally polarized 
when hung in it's normal configuration.... H But you can lay it on its 
side for vertical polarization.... ==
Ed
At 11:44 PM 11/4/2006, you wrote:
>I did try a moxon. It actually gave me similar results to the dipole. I 
>think I'm getting a lot of multipath interference so I think something 
>directional is perhaps not the way to go after all.
>>How about using a magnetic loop antenna? I've not read too much about them 
>being used on 2m but I can't see why not.
>>Would they be a good way to capture a 'hot spot' indoors?
>>(I know I could build an outdoor antenna but i'd much rather face the 
>challenge of doing it inside!)
>>Richard
>>>Ed Griffin wrote:
>>Instead of a small yagi, I'd suggest you try a Moxon. It would be simple 
>>to build and smaller than the yagi. There is information and a dimension 
>>calculator at http://www.moxonantennaproject.com/design.htm
>>73
>>Ed
>>KMA Antennas
>>At 02:35 AM 11/2/2006, Richard Greaney wrote:
>>>Hi all
>>>>>>Some of you might recall my posts not too long ago enquiring about the 
>>>ideal antenna to use to pick up my local airport control tower on VHF. I 
>>>settled on a simple dipole which I've had mounted inside in one of the 
>>>'hot spots' in my study. The reception is weak but very readable at 
>>>best, although on a bad day things do decline quite a bit. I opted for a 
>>>dipole over a discone because of the horizontal gain. Discones are 
>>>generally recommended for aviation use because they are omnidirectional, 
>>>but all the stations I'd be tuning in the overhead position would be no 
>>>more than about 9km away, and with only my roof between them and the 
>>>antenna, it seemed wasteful to go for a true omni.
>>>>>>The indoor dipole is not ideal, and if I were to mount it outside it 
>>>would certainly outperform any indoor antenna of equivalent quality. 
>>>However, circumstances at the moment make an indoor antenna a much more 
>>>feasible option than an outdoor, so I'm trying to improve on it. I've 
>>>read a few articles, in particular this one 
>>>http://www.hamuniverse.com/K4mmg2and6meter.html mentioning that you can 
>>>take advantage of the low velocity factor of certain types of coax to 
>>>build an antenna with shorter elements than you'd normally require. Has 
>>>anyone done this with success?
>>>>>>I'd like to try a 3-element Yagi done this way, but thought I'd see if 
>>>anyone has any experience with shortened Yagis.
>>>>>>Regards
>>>Richard

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