Because of the interest in the dual-band (12/17) open sleeve coupled
designs, one of which I noted on one list, I have enlarged the following
item at my site: "Director/Driven Element 2-Element Yagis" under upper HF
notes. It now contains design details on both a back-to-back DE/Dir
design and on a DE/Ref-17/DE/Dir-12 design. The latter needs a longer
boom (10') and has reduce front-to-back ratio on 17, but both beams point
the same way and the match is 50-Ohms on both bands.
I hope the information is useful to those thinking of stacking a light
beam atop their giant tribanders as the WARC bands open--and those who
would like something to home brew to sample those bands.
-73-
LB, W4RNL
L. B. Cebik, W4RNL /\ /\ * / / / (Off)(423) 974-7215
1434 High Mesa Drive / \/ \/\ ----/\--- (Hm) (423) 938-6335
Knoxville, Tennessee /\ \ \ \ / / || / (FAX)(423) 974-3509
37938-4443 USA / \ \ \ \ || cebik@utk.edu
URL: http://web.utk.edu/~cebik/radio.html
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|