[TowerTalk] 20m yagi with dual de els.

[Jim Thomson]

Date: Tue, 9 Mar 2010 04:10:36 +0100
From: "Stein Roar Brobakken" <s-roabr at online.no>
Subject: Re: [TowerTalk] 20m yagi with dual-driven element

Thanks for feedback 

Dave, Was there a big difference between the 5 or 6 el ????

Ok, about the bandwidth of dual driven. 

73 LA6FJA Rag


## why not just use the OWA  design??  Then u get a more consistent pattern
across the band.  6 -els on a 44'-48' boom.  The swr / F/R, gain patterns  are 
flatter across the band.  No double swr dips , like the dual DE  designs. 

## Even M2  has a new 20m yagi  with the OWA  direct feed, No hairpin.

## Then no losses in any hairpin.  Direct feed.  Just use a choke balun.

## Like large 1" diam  x 1"  long  x 1/2"  ID  type-43 beads slid over
RG-393 Teflon coax... or 213-u... [ or FSJ-4-50]    All 3 x of the cables  work very
well with 17x beads used.   Z = 1488 ohms.   I use  7-16 DIN  connectors on all
mine.  You can not blow it up, good for 10 kw  cxr, ccs [393 coax]  Then it's super
reliable at  1.5 kw... even with 213-U   

later.. Jim   VE7RF