Vinnie S. wrote:
On Sat, 24 Dec 2005 16:27:10 GMT, "GHB" wrote:


The radio shack GP w/ horizontal radial worked but had higher SWR than the
starduster with it's drooping radials. Have you considered using an old
102" SS whip mounted on drooping radials that you would construct? The
drooping radials would allow for an almost perfect 1:1 SWR match but include
the spring since the vertical element needs to be 108" long. This antenna
would essentialy be a starduster.



Can he make a longer radiating element and put the radials at 90 degrees? That
woulb be easier than drooping the radials.

Vinnie S.

Resonance occurs due to the physical lenght of the radiator plus any
coils minus any capacitance. The electrical match is due to the feedpoint
impedance. An odd quarterwave has a low impedance. Anything else has a
higher impedance. To match 50 ohm unbalanced coax to various types of
antennas, baluns and beta/delta/gamma matches were created.

Some antenna designs have the radials at 90 degrees because that is
where the designer put them to work properly with their design.