[TowerTalk] 20m yagi with dual-driven element

[Stein Roar Brobakken]

Hi

I have plans to make a 4 to 6 element yagi for 20 or 40m since I have pretty
lot of aluminum tubes and parts in stock.


Have any other made a mono-band yagi with dual-driven element like the such
like:
* KLM  KT34XA ? KLM use 55" / 140 cm spacing about 0.065 wavelength on 20 m.
*KLM 40m 4 el with dual driven element. I don't what spacing they use this
one, but it works super from OH8X in stack 1/2 wl spacing.
*The 2 el dual driven element 40m yagi from http://www.cal-av.com/2d-40.html
which using 0.11 wavelengths.

The Dual driven element is nothing new as it is almost the same as HB9CV and
ZL-special which use about 0.125 wavelength spacing between "the front and
rear" element.

What do you think is the good optimized setup to use in a 4 to 6 el yagi ? I
am just familiar with old Quickyagi and not familiar with Eznec, but I am
wondering if anyone have calculated or tested this things??


I planned just to use same configuration as a 3 element yagi with same
spacing to reflector and director, BUT with dual-driven elements..... I
cannot model it in quickyagi...


73 LA6FJA Rag