[BC] Skirt feeds.....

[Cowboy]

On Saturday 20 February 2010 08:43 am, Craig Healy wrote:
>  Interesting thread on the skirt fed towers...

>  Third thing is a question.  If the best feed point is a quarter way up, what
>  works best for a shorter tower?  Feed at the top?  I have another client
>  with sixty degree tower height.  At some point it may be worthwhile to
>  research a change to skirt feed for a few reasons.

 I'd put it as close to 1/4 wave as you can get, which would be the top
 in the case described.

>  Last question...  If the skirt feed is brought out from the base and then
>  back in, would it increase the bandwidth?  
 
 Yes !
 The military design you describe has a name, ( I forget ) but in that case
 the wires are bonded to the supporting structure both top and bottom,
 and the whole thing is a series fed radiator, intended to effectively
 increase the R/D significantly.
 It works.

 Other than me ( once upon a time ) I know of no one who tried it
 as a skirt feed.
 Worked "OK" but feed was complicated.
 I wouldn't recommend it without modeling.

-- 
Cowboy