Re: [amsat-bb] receiving system design tradeoffs

[Jon Ogden <na9d-2@xxxxxxxxxxxxx>]

on 2/5/03 7:21 PM, Frederick M. Spinner at fspinner@hotmail.com wrote:

> Your 23" G3RUH is at least a 6dB better setup than a BBQ, so my point still
> remains here.  It's a money versus time versus mechanics
> issue. 

Fred,

How is this the case?

I assume the following:

BBQ: 36" x 24"
Feed: Linear, dipole

G3RUH: 23" in diameter
Feed: CP, patch

At best, you should see a 3 dB improvement with the change from linear to
CP.  I suppose you will also see some improvement as the pattern of the
patch is probably better than that of the dipole feed on the BBQ.  The BBQ
should have a little more gain in the sense that it has more area than the
G3RUH.

So balance it out and I can't find where that extra 3 dB comes in.

Help.

Jon

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Citizen of the People's Democratic Republik of Illinois

Life Member: ARRL, NRA
Member:  AMSAT, DXCC

http://www.qsl.net/na9d   <- Updated on 1/22/03!!!

"A life lived in fear is a life half lived."


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