Re: [amsat-bb] BBQ Dish Gain

["Frederick M. Spinner" <fspinner@xxxxxxxxxxx>]

I can believe it, that's why it's called a MODEL.  My guess that the 
efficiency is overestimated in NEC-2.  This isn't unusual for NEC-2 with 
"reflector screen" antennas.

All I can say is that I've seen range testing on BBQ's more than once and 
usually the "24 dBi" antennas test in between 18 and 20 dBiL.  Never better 
than that.  +/-2 dB or so is about the accuracy of the ranges that hams use 
in parking lots at VHF/Microwave Conferences.

Fred W0FMS


<rom: Scott Townley <nx7u@arrl.net>
>To: amsat-bb@AMSAT.Org
>Subject: Re: [amsat-bb] BBQ Dish Gain
>Date: Sun, 09 Mar 2003 06:41:08 -0700
>
>I have a NEC-2 model of K5GNA's 38"x26" BBQ dish, including the integrated 
>AIDC3733 dipole/reflector plate feed.  Interestingly enough it comes out to 
>25.5dBi maximum forward gain.  This gain calculation would include 
>spillover and aperture illumination efficiencies.  That's a nearly 70% 
>reflector efficiency...hmmm...
>Of course, in circular terms that's 22.5dBic.
>


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