1296 Antennas, hombrew, most sensitive dimension

[AA6EG]

I plan to build some 1296 yagis, for moonbounce. I am aware of the need for high accuracy for translating computer model yagis to reality. The 1296 yagis are going to be used for moonbounce and will have wooden booms, need to be mamimally efficient. Can anyone who has done this, tell me the most hyper sensitive dimension in such a yagi? I am thinking 10 ft (3m) boom).

1.individual director element lengths
2.Director element spacings
3.Straightness of the boom.
4. Driven Element length, Matching
5.Driven element to Reflector Spaciing
6.Driven element to Director Spacing
7.Driven Element Length
8. Reflector length.
Tnx, DX de Pat AA6EG

 

[dyke]

Martin E. Meserve - K7MEM - VHF/UHF Yagi Antenna Design

Is this what you were looking for?

 

[mr_fx]

The most important things is going to be the driven element length and straightness of the boom and the elements need o be on the same plane...

so long as the reflector is the largest and the directors are smaller than the driven element, and that all of them are pretty close it should work fine...

Also you can play with the element spacing, longer spacing generally means more gain, but there are trade offs, and there is a point when the lengths is too great to get more gain.

 

[Moleculo]

Check out the links to plans for homebrew yagis. I built one for 1.2 off of these plans. The second link is a calculator that lays out the dimensions and spacing based off the parameters you input. It's pretty cool!

http://www.worldwidedx.com/home-brew/38140-build-your-own-cheap-vhf-uhf-yagi-antennas.html

http://www.worldwidedx.com/useful-ham-links-tools/35901-dl6wu-yagi-calculator-spreadsheet.html