View Single Post
  #36   Report Post  
Old January 20th 08, 05:56 PM posted to rec.radio.amateur.antenna
Richard Clark Richard Clark is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 2,951
Default Linear Loaded Antennas ??

On Sun, 20 Jan 2008 09:03:05 GMT, "Lee"
wrote:

Yes. Richard, you have it now...i was mainly concerned about the spacing
of the foldback from the parent element as i have seen much more exotic
layouts using 3 and four foldbacks using 400ohm ribbon feeder for the
element which i might try for 80 and 160, but i`ll make those using spaced
single wire dipoles rather than utilise a rigid rotatable ten meter dipole
and
a couple of lengths of wire..


Hi Len,

As for going lower to 80M using 3 or more foldbacks (for the simpler
dipole) to keep it in your garden. Stick with your mag loops, because
it doesn't get any better.

Using 3 foldbacks for 80M (and the antenna is too wide for your
garden) will give you a 10 KHz bandwidth at the 2:1 SWR points. Making
the antenna smaller to fit, drives up the Q. 160M only portends worse
Q (from your point of view).

A small dipole, like a small loop, either are going to be hi Q if they
are to be efficient.

maybe i can do the same again for a reflector??

_______________O_______________
[_____________ I _____________]
I
I
_________________I __________________
[_______________ ________________]


YOW!!!

You are now getting quite elaborate. You can accomplish this, with
great care, and if you have the patience to raise and lower this half
a dozen times or more to get it right.

73's
Richard Clark, KB7QHC