HI Tom!
After 25 years with Gamma matches and Beta match feeds, the direct 50 ohm feed
(with a good choke) OWA Yagi is the only way to go.
There is no decrease in gain by using a OWA design. I have carefully modeled the
OWA vs. conventional low impedance feedpoint designs. The only draw back to the
OWA is one additional element for a given boom length (this close spaced 1st
director creates a 50 ohm feedpoint impedance for direct feeding and great VSWR
bandwidth - nothing more). The gain and F/B bandwidth are not changed by the use
of the OWA feed system design.
73!
Tim K3LR
Just finished the last of the 4 high stack of new 20 meter 6 ele OWA Yagis on 50
ft booms for 24 elements!
Tom Rauch wrote:
> What's the latest thought on Yagi antennas? Is the old work
> by Lawson on Yagis still considered accurate so far as boom
> length, number of elements, and gain?
>
> Or is there some newer information that casts doubt on his
> work?
>
> I'm going to play with some 34 foot boom 20 meter antennas.
> They were originally 5 elements but it looks to me like I
> might as well throw one element in the dumpster.
>
> 73 Tom
>
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