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Re: July 2001 President's Letter



No one else controls your equipment for TDMA any more than they do for the
current FDMA system. Think of the timing information as a beacon. Today we
control the amplitude and frequency that we use relative to the beacon.

TDMA does require a large bandwidth so it would interfere with SSB users on
the same transponder. If both the S1 and S2 transmitters are activated at
the same time with different receivers it might be possible to perform some
testing. The TDMA scheme discussed in the past on this BB would use a
hard-limiting transponder so more uplink power would be required in the
absence of the "capture effect" of the limiter. The AGC is a disadvantage in
this case as it reduces the SNR of the digital signal.

73,

John
KD6OZH

----- Original Message -----
From: "John Wilcox" <ns1z@agate.net>
To: "'Amsat BB'" <amsat-bb@AMSAT.Org>
Sent: Friday, 20 July 2001 10:35 UTC
Subject: Re: [amsat-bb] July 2001 President's Letter
>
> It sounds like a fun experiment but I wonder if the complicated equipment
> required and the idea of some other station controlling your equipment is
> going to fly with many satellite users???
>
> Since TDMA can be used on the current transponder, will we see any TDMA
> activity soon?
>
> ----- Original Message -----
> From: John Stephensen, KD6OZH <kd6ozh@gte.net>
> To: Dan James <nn0dj@wiktel.com>; 'Amsat BB' <amsat-bb@AMSAT.Org>
> Cc: <ve3frh@asmat.org>
> Sent: Friday, July 20, 2001 12:20 AM
> Subject: Re: [amsat-bb] JUly 2001 President's Letter
>
>
>
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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