[50mhz] 6M yagi designs/redesigns

Mon, 15 Sep 2003 17:46:10 -0600

Hello Bill,

Thank you for your offer to publish the optimized 5 element CC design.  I have 
encountered many 6m operators around the world that use that antenna, and I sure 
would like to see them optimize that antenna for the most forward gain.  Although it 
is a very commonly encountered antenna, it became popular before the era of computer 
optimization, JT44, and low suspot cycles.  Extending the length of that yagi to a 
full wavelength should help considerably!

Thanks again for your efforts and contribution to the Magic Band!  VY 73, Lance

Bill VanAlstyne wrote:
> I've had a number of e-mails from list members requesting length/spacing
> numbers for various configurations of 6M yagis. Bear in mind that optimizing
> a yagi design requires knowledge of a lot of dimensional variables, like
> boom construction technique, diameter, and tapering; element construction
> technique, diameter, and tapering; style of element-to-boom clamps used and
> their dimensions; type of feed system used and its construction; etc.
> 
> Modifying a manufactured (stock) antenna entails inputing all the
> construction and dimensional information into the program. If you are
> modifying a Cushcraft, as I did, then that's already done, and all I have to
> do is fill in a few details. For antennas of other manufacture, however, all
> bets are off. Same for home-brew antennas. I would have to start from
> scratch.
> 
> I did find doing this kind of work on the computer to be really fun,
> however, so I highly recommend YO to everybody who wants to enhance his
> yagi. You'll learn a lot about antenna design, and you'll probably end up
> with a design better suited to your exact needs by playing with the software
> yourself, trying out different design options and trade-offs, etc.
> 
> That said, I'll be happy to run some models for a few people who don't have
> the means to do this on their own -- long as things don't get out of hand. I
> still have to work for a living. <g> You'll need to tell me the dimensional
> properties of your antenna or design as described above, and I'll see what I
> can come up with. No implied warantees, fitness for a particular purpose,
> your mileage may blah, blah, blah... The usual disclaimers.
> 
> If there is enough interest in the modification of the Cushcraft A50-5S
> antenna into a longer, better-optimized 5-el beam, I'll write up the exact
> procedure and dimensions and publish it.
> 
> Bill / W5WVO
> 
> 
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment.  Attachments are not allowed.  To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html  ---
> Moderator: Ray Brown, KB0STN
> _______________________________________________
> 50mhz mailing list
> Home: http://mailman.qth.net/mailman/listinfo/50mhz
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:[email protected]
> 
> 

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   FAX:(406) 626-5728
URL: http://www.bigskyspaces.com/w7gj