Re: [amsat-bb] AO-40 Downlink Antenna Question

["hasan schiers" <schiers@xxxxxxxxxx>]

If you are getting 20w to the 40cx, you are NOT LIGHT on the uplink...you
have PLENTY of power to trigger Leila quite easily and any more power is
useless. You need to work on your receive side.

I know this is getting to be an "old saw", but ...

Download the ao40 Excel spreadsheet from Amsat's FTP site. It has a set of
instructions (written hastily by me) on how to use it. You can fully
evaluate your transmit and receive performance with it and the manufacturers
specs. This will tell you where to spend your money, what to fix, etc. etc.

There is no substitute for playing with this Link Budget Analysis Tool.
....you will learn a LOT and avoid making terribly mistakes. As I have said
before, this is a MUST HAVE utility for anyone who is going to use AO-40.

73,

...hasan, N0AN

----- Original Message -----
From: "Ralph Quallich" <kf4hr@erols.com>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, December 08, 2002 9:39 PM
Subject: [amsat-bb] AO-40 Downlink Antenna Question


> Hello all,
>
> I finally was able to become operational on AO-40 this evening.  I heard
> a couple copyable qso's and even some sstv, but the signals were very
> weak (S0 to S1) and headphones were a must.  I also was able to hear my
> return signal too, but just above the noise.
>
> My working conditions are; Yaesu FT-736R, Kuhne 2.4ghz down converter,
> 24dbi (~3'x2') bar-b-que dish with a linear feed for receive.  KLM
> 435-40CX 40 element circular yagi for uplink.  Power output about 25
> watts (~20 at the antenna).
>
> I realize I was somewhat light on the uplink power and have a brick amp
> to improve that, but more importantly I'd like to improve my receive
> side first.  Question: Does anyone know if that's a small (3' to 4'
> diameter) 2.4ghz dish available, perhaps with a circular feed that will
> improve my reception over my barbque dish?  Ideally, I'd rather not go
> the TVRO dish route just yet, but would rather find a small dish that my
> Yaesu G-5400 Az/El rotator can handle (with careful counter-balancing of
> course! :).  Any suggestions?
>
> Tnx in advance,
>
> Butch Quallich, kf4hr
> Email: kf4hr@erols.com
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