[Antennas] Mini Yagis using Coax

[Richard Greaney]

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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