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Re: AO-40 status report by DJ4ZC



Tony,

Symek, www.symek.com, has the TNC31S and TNC3S.  I am currently using the
31S.  It only has one modem and I'm using it to decode UO-36 data (or was up
until a couple of months ago when I started back to school).  After reading
your post, I dug out the manual.  Apparently, the TNC31S supports up to
76800baud.  There are some minor modifications that are required.  I *think*
the manual is available at the above site.

You should see 38k4 from UO-36.  If you think 9600 is fast (and it is with
ASCII), you should see 38k4.  It's faster than my ISP connection at 24k.

GL,
Joel, K2SAT

----- Original Message -----
From: Tony Langdon <tlangdon@atctraining.com.au>
To: 'Phil Karn' <karn@qualcomm.com>; <na9d@mindspring.com>
Cc: <amsat-bb@AMSAT.Org>
Sent: Tuesday, November 21, 2000 11:27 PM
Subject: RE: [amsat-bb] AO-40 status report by DJ4ZC


> > If you look real hard, you'll find my link budget showing how with
> > error control coding enabled, the RUDAK 70cm downlink can support a
> > reliable 67 kb/s from apogee to a simple patch antenna lying flat on
> > the ground.  That's a pretty major advance over anything that's been
> > ever possible with amateur satellites and simple unsteered ground
> > antennas. It should entice many more hams into satellites, which I
> > assume is our shared goal.
>
> Just one question, is anyone close to having working hardware for such a
> link?  And if so, what applications are being supported?  Data only, or
are
> their hooks for digitised voice/video/etc?
>
> Not picking, just would love to be a part of this sort of thing. :)  A
70cm
> patch on the roof would be invisible, I can see benefit in that too.
> Though, if the downlink is on the wrong frequency, 70 would be a mess for
> me, due to cable QRM...
>
> > You'll also see that my analysis showed that if you're constrained to
> > unsteered ground antennas, no other band works as well as 70cm.  As an
> > interesting aside, the US military has for some time relied heavily on
> > UHF for mobile satellite communications.
>
> I recall seeing something from you on this.  Do you have your analysis
> online, would like to have a look.
> ----
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