WA4DSY modems

[hqm%VALLECITO.SCRC.Symbolics.COM@Sdsc.BITnet]

    Date: Tue, 5 Apr 1988 09:33-EDT
    From: Ralph.Hyre@IUS3.IUS.CS.CMU.EDU

    More importantly, who will we be able to talk to?  We're in Pittsburgh, PA.
    It would be nice to be able to talk to Columbus, Cleveland, Charleston,
    Maryland/DC (the wormhole,perhaps?) and perhaps Philadelphia direct.

I am interested in trying to use the Phase 3C AMSAT satellite for TCP/IP
networking. I sent away for info from them, and I talked to an AMSAT
person about what modes and bandwidths were available. They actually
have some sort of packet mode on the thing (RUDAK?) which sounds like
not quite the right thing at all.

The info I got on modes from KA1M, ( Andy Deskur ) was

 Transponder

  L Band 1269 up 435 down 250khz

  U band 435 up 2m down 150 Khz

  S band 435 up down 2.4 Ghz 30 Khz FM

  RUDAK ax.25 2400 baud 400 baud down(?)

  Launch May 26 , telemetry  (BBS in Iowa)

He said that AMSAT would be interested in people experimenting with
efficient packet communications (i.e., not bell 202). He said that maybe
if we were organized about it, we could get 50 Khz out of the L band or
something in the S band.

If anyone else is interested, maybe we can coordinate this. I am
gathering information on the needed components for a groundstation.
(antennas, rotors, transverters).

Phil, you know lots about satellites.  Do you think it is reasonable to
try connecting some isolated subnets using this technology? What is the
equipment needed to do this? I have seen at least two ads for 19.2 KB
(GLB and AEA) radio modems for 220 Mhz. Maybe this is the right off the
shelf stuff?

Andy said that they expect a surge of interest in the satellite once it
gets up.