[amsat-bb] Re: RAFT Fence Doppler Plot Posted

[Robert Bruninga]

ARIZONA COMMAND STATION NEEDED:

Although Matt at UC Irvine got RAFT radar transponder turned on,
last night, the pass time is moving east again, and the only
place to command it on tonight (0500z or 11 PM MDT) is Southern
Arizona or NM. 
If there is any OSCAR class satellite station with 2m packet in
Arizona
 please let us know.  

RAFT deorbits in a day or so.  It was down to 100 nmiles today! 
Last chance...Thanks.  Bob, WB4APR

> -----Original Message-----
> Sent: Monday, May 28, 2007 1:25 AM
> 
> RAFT-REENTRY CAMPAIGN web page now has a Doppler Plot against
> TIME:
> http://www.ew.usna.edu/~bruninga/craft/save-raft.html
> 
> To our surprise, the RAFT XP-217 radar receiver hears the
Radar
> sidelobes as long as it is above the horizon!  I guess that
> makes sense for a 700 KW transmitter.  Even if we are not in
the
> 80 Meggawatt main beam, the radar receiver does still hear it
> (even though its RX sensitivity was intentially only designed
to
> be only  - 40 dBm? or so)...
> 
> Now, is there anyone on the AMSAT-BB that would like to
analyze
> this portion of the Doppler Plot and prove the timing.  The
only
> thing I'd like to confirm is the added inflection point at the
> start (probably due to the bistatic radar situation) which
makes
> this different than the usual "S" plot with only a 3rd order
> curve.
> 
> Bob
> WB4APR
> 
> 
> > -----Original Message-----
> > From: Robert Bruninga [mailto:bruninga at usna.edu] 
> > Sent: Monday, May 28, 2007 12:26 AM
> > To: bruninga at usna.edu; rx217 at alum.WPI.EDU; 'Matt Bennett'
> > Cc: 'Lauret & Henk'; 'Ron Hashiro'; 'Dieter Schliemann'; 
> > mail at mike-rupprecht.de; iana at kcbbs.gen.nz; 
> > k.swaggart at charter.net; jf1aje at aprs.xii.jp; 
> > veillet at cfht.hawaii.edu; tanimoto at hawaii.rr.com; 
> > ah6gr at arrl.net; dquagliana at aol.com; hhm_74115 at cox.net; 
> > walterh at k5wh.net; crabtrej at erau.edu; wa6lie at msn.com; 
> > ea4ekh at telefonica.net; zl2cia at amsat.org; 
> > geoff.clark at clear.net.nz; matsu at aje.jpn.org;
> ei7m-wkt at asahi-net.or.jp
> > Subject: RAFT Voice may notebe fully set?
> > 
> > I blew my pass.
> > 
> > It arrived about on schedule (Keps dated 27th at 1313z.)
> > At first I got no response to my LOGGON attempt.  SO I
assumed
> > that the southern stations attempts had locked me out.  So I
> > forced a  disconnect so that I could reconnect to RAFT and
at
> > least check out the voice.
> > 
> > That was successful, but then I saw the  earlier password
> > challenge coming back.  At this time I was no longer
connected
> > and didn't have time to re-sequencce everyting.
> > 
> > SO my commaindng was a failure due to cockpit error.
> > 
> > BUT when I CONNECTed RAFT, the VOICE came up just fine, but
> did
> > NOT speak any packets sent to it.  So I wonder if all
settings
> > are correct.  Maybe the European or other command stations
not
> > in the footprint of the Southern USA FENCE could logon and
SET
> > these settings:
> > 
> > MYAPRS TALK
> > MXMIT ON
> > 
> > It is clear that the others ARE set OK, since CONNECTing
RAFT
> > does bring up the voice transponder.  SO these are OK and do
> not
> > need to be confirmed.
> > 
> > CTR A OFF
> > CONOK ON
> > CMSG OFF 
> > 
> > But if MYAPRS TALK is not set or if MXMIT ON is not on, then
> the
> > voice module will not speak APRS messages...
> > 
> > Bob, WB4APR
> > 
> > 
> 
> 
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