[TowerTalk] 40 shorty plus 10M?

[Pete Smith]

At 05:53 AM 6/6/00 -0600, n4kg@juno.com wrote:
>
>The driven element of a 402CD has a reasonable match
>on 17M.  I have always thought it would be a good idea to
>put a 17M reflector 8 ft behind the driven element.
>
>To add 12M, it is tempting to place an 'open sleeve' near
>the DE and another reflector spaced 6 ft behind the DE.
>
>There is no reason that 10M could not also be added
>using another open sleeve and reflector.
>
>By using the existing 40M DE as the driver for open sleeve
>elements on other bands, destructive interaction is avoided.

Experimentally, people have found that when stacking an open-sleeve-fed
yagi with one using a conventional feed, it is necessary to use
substantially different feedline lengths, because the open sleeve feed
introduces considerable phase shift (in one case, ~160 degrees was
reported).  I wonder whether this would screw up the 40-meter performance
of the 40-2CD, when used alone.  Anyone know?  


73, Pete Smith N4ZR
n4zr@contesting.com 



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