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Re: AO-40, K-band Tx Test Successful!



Oh, GEEZ!! Just when we were getting comfortable with our MDS conversions,
another challenge.

Where do we look for equipment to convert? I'm ready to start!

Great Job, Team!

----- Original Message -----
From: Stacey E. Mills <w4sm@cstone.net>
To: Amsat Bulletin Board <amsat-bb@AMSAT.Org>
Sent: Monday, September 10, 2001 2:09 AM
Subject: [amsat-bb] AO-40, K-band Tx Test Successful!


>
> On Orbit 396, MA=118 to 138, the K-band (24.048 GHz) transmitter was
active
> and connected to the same inputs as the S2 transmitter.  The passband and
> beacon were first detected by Petra G4KGC (radio op) and Charlie Suckling
> G3WDG (dish op) at 1930 utc,  MA=122.  Shortly thereafter the beacon and
> passband were also detected by Michael Fletcher, OH2AUE.  The Suckling's
> used a 22 cm offset dish and reported signals 6 dB above the noise
> floor.  Michael used a 60 cm dish and reported that the beacon was 7 db
> above the noise floor under less than ideal conditions with overcast skies
> and occasional rain.  Both used linear feeds and reported good, stable
> signals except for cyclic deep fades due to the linear polarization of the
> K-Tx antenna,  the linear polarization of their feeds, and the rotation of
> AO-40.  A circularly polarized feed should eliminate these spin fades.
>
> The command team is delighted to report this additional functional
> transmitter on AO-40!!!
>
> ---W4SM for the AO-40 Command Team
>
> --
>   _______________________________________________________________________
>   Stacey E. Mills, W4SM    WWW:    http://www.cstone.net/~w4sm/ham1.html
>    Charlottesville, VA     PGP key: http://www.cstone.net/~w4sm/key
>   _______________________________________________________________________
>
> ----
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>

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