RE: NEC-LIST:nec2 newbie question: Biconical antenna

Right,

discones are also very popular as 2m repeater antennas, and there we have a
nice opportunity to observe wire skeletons in action, just like with NEC.
I just remembered some RF labs' exercises using discone. It was made as a
copper (plate) cone, also closed at the base where a connector was fitted.
I guess a rigid cable was inside a cone, as the disc was welded directly on
the cable end. All in all, very handy construction.
There are no baluns associated with discones, and it is a whole beauty of it.

Davor

At 19:50 2002.10.17 -0600, you wrote:

>Just to add something that I'm sure Davor knows but didn't say:
>
>Biconical dipoles and discones are both broadband dipoles. They both
>broadband a conventional half wave dipole by virtue of a tapered "fat"
>element. Discones are popular at higher frequencies because of the solid
>surface of the elements being better behaved than individual wire elements.
>I don't have it readily available, but there was a good paper in the IEEE
>Transactions on Antennas and Propagation a couple of years back on the
>modeling of a skeletal biconical with NEC. They struggled quite a bit to
>make the model match the real thing (a Rhode & Schwarz if I remember
>correctly). I tried to reproduce their work and found similar problems
>trying to model an EMCO 3108.
>
>Brent
>
>-----Original Message-----
>From: nec-list-admin_at_gweep.ca [mailto:nec-list-admin_at_gweep.ca]On Behalf
>Of Davor Virkes
>Sent: Thursday, October 17, 2002 12:42 AM
>To: nec-list_at_gweep.ca
>Subject: Re: NEC-LIST:nec2 newbie question: Biconical antenna
>
>
>Hi,
>
> >The antenna should be connected to a spectrum analyzer via BNC or
> >N-Connector (50 ohms).
>
>Discones are much better suited for excitation with coax, and are easily
>built. In this configuration, it could be designed as a snap-on, and used
>as a handy reference antenna for signal level measurements eg. for micro
>and pico cells.
>
>Davor
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