[Antennas] Mini Yagis using Coax

Thu Nov 2 08:28:01 EST 2006

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
>______________________________________________________________
>Antennas mailing list
>Home: http://mailman.qth.net/mailman/listinfo/antennas
>Help: http://mailman.qth.net/mmfaq.html
>Post: mailto:Antennas at mailman.qth.net

 KMA Antennas
 HF - VHF - UHF Log Periodic Antennas
 For Research, Military and Amateur
 http://www.kmaantennas.com
 Support qsl.net with a donation
 https://proxy.qsl.net/donation