On Fri, 14 Sep 2007 16:17:42 -0500, "amdx" <amdx@knology.net> wrote:

>I've posted a picture on >alt.binaires.schematics.electronic<
>to an effort to help me get a better understanding of an antenna.
>It is a 2.4Ghz antenna about 18" long
>The driven element is a copper ribbon 0.2" wide by 0.032" thick.
>The copper ribbon forms a loop about 2" wide by 0.625" tall.
>The gap in the ribbon would be 0.020", but note; in the pictures
>a moon shaped piece has been cut from both ends. I think this

yes, it was made on a moonday.

>moon cut effectively make the gap look larger.
> The total coax length is 2.350", the shield a bit shorter at 2.08".
>There are 4 toroids on the coax. These are under a piece of heat
>shrink, so I have no idea what material they would be.
> All element spacings are all equal and element lengths are within
>.030" of each other. I think they were designed to be the same but
>manufacturing tolerances made the differences. The reflector is longer.
> So now what can the group tell me about;
>Driven element impedance
>the gap
>coax length impedance transformation


>the 4 toroids
noise reduction ferrite beads or toroids
Line filters get rid of RF travelling along the outer surface of the
coax's shield and avoid, consequently, any TVI/BCI. The best
performance can be seen when connected right into the feed line at the
antenna base!




>Thanks for the help, if you need any other details let me know.
> Mike
>
hard not to be cynic.
w.