[Antennas] Re: Elevated Ground Plane Question

[cboone@earthlink.net]

ACTUALLY, a discone IS like a ground plane..it is NOT inverted...
the DISK at the top is fed by the center of the coax...the cone fed
by the shield! However it acts as a wideband high pass filter to the 
air....so it covers many octaves above its designed Cutoff freq...
But inverted?? nope....it is not..btw you CAN add a vertical radiator
to the disk for a single or multiband operation....some of them now do
this so the disk itself covers 100Mhz and up and the vertical covers
whatever bands needed below that.

Chris
WB5ITT

alexander eban wrote:
> 
> ...no, the discone is really an inverted ground plane, a top fed. It main
> virtue when ic came out first was its wide band capabilities, nothing else.
> As far as the other characteristics are concerned, you can turn it "wrong
> way up" without any but mechanical problems. We tried it in the air force
> and couldn't detect any differences between the nomally mounted one and the
> "upside down" one. It was at the time at a height of about 10-12 feet.
>                 Alex    4Z5KS