[amsat-bb] Arrow modification

[Kenneth P Alexander]

Hi Doug,

Simply moving them into the same plane will likely cause problems because
the bands are harmonically related.  The 2m elements will make a mess of
the 70cm radiation pattern if they're in the same plane.  That said, I did
just stumble across a satellite yagi design where the elements were
intentionally in the same plane.  Only the 2m yagi is fed and a passive 70
cm driven element is placed close to the 2m driven element so the 2m
element excites the 70 cm passive element, causing it to radiate on 70 cm.
I believe it's called an open sleeve design.  I think it was 3 elements on
2m and 3 or 4 elements on 70 cm.  Sorry I didn't bookmark the page.  I
don't remember where I saw it.  Hopefully someone else saw it and remembers.

Happy New Year,

Ken
bueng-ken.com


On Tue, Jan 1, 2019 at 10:20 AM Douglas B Tabor via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> I’ve been using my well faded Arrow for 4 years. The boom is a much
> appreciated LIDstick so the old man can swing it as well as a 3 year old.
>
> Has anyone modified the Arrow to have 2m and 70cm elements in the same
> plane (instead of stock 90 degrees)? I’m just curious what the performance
> result might be - I know it would be easier to get in and out of the
> RoverMobile instead of doing the twist-and-angle it out.
>
> HNY and 73,
>
> Doug, N6UA
>
> Douglas Tabor
> dtabor52 at icloud.com
>
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