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Re: FM Satellite Summary (October)



The center frequency for Sedsat-1 was found to be closer to
437.9132 Mhz after it was launched.  Depending on the state
of the batteries, it will send a 9600 baud FSK burst of telemetry
data every 60 seconds.  During a very healthy charge and positive
power it will transmit every 30 seconds.  You may not hear this
satellite on every pass because its operation depends entirely
on the health of the batteries.


Tim - N8DEU
Huntsville, Alabama


----- Original Message -----
From: "gustavo carpignano" <gcarpi@sinectis.com.ar>
To: "Bob Bruninga" <bruninga@nadn.navy.mil>; <amsat-bb@AMSAT.Org>
Cc: "TAPR APRS Special Interest Group" <aprssig@tapr.org>
Sent: Tuesday, October 10, 2000 12:24 PM
Subject: Re: [amsat-bb] FM Satellite Summary (October)


> Bob,
>
> you forget SEDSAT-1 SO33 is sending on 437.910 MHz, telemetry at 9600 bps
> FSK, one packet every minute.
>
> Regards.
>
> Gustavo, LW2DTZ
> ----- Original Message -----
> From: "Bob Bruninga" <bruninga@nadn.navy.mil>
> To: <amsat-bb@AMSAT.Org>
> Cc: "TAPR APRS Special Interest Group" <aprssig@tapr.org>
> Sent: Monday, October 09, 2000 1:14 PM
> Subject: [amsat-bb] FM Satellite Summary (October)
>
>
> > Here is a one line summary of currently active FM birds that you can
> > receive on your Mobile or HT FM rig and mobile vertical whip antenna.
> >
> >  1) SUNSAT in Mode B for APRS/UI and PARROT mode for voice to 10 Oct
> >  2) MYSAT is a new signal on the air, but not enabled for user uplink
> >
> > SAT   DOWNLNK UPLINK  S MODE               COMMENTS
> > ----  ------- ------- - ------------------ ----------------------------
> > UO11  145.825         4 R FM Bell202 ASCII Telemetry only
> > UO14  435.070 145.975 5 J FM Voice rptr    lots of fun every pass
> > AO27  436.795 145.850 3 J FM Voice rptr    days only but fun
> > SO35  145.825 436.290 8 B FM Voice rptr    One pass per day after 10 Oct
> >       145.825 145.825 8 P FM VOICE PARROT  On through 10 Oct
> > UO22  435.120 145.900 3 J 9600 bd FSK BBS  ON
> > KO23  435.170 145.900 4 J 9600 bd FSK BBS  OFF&ON unreliably
> > KO25  436.500 145.980 3 J 9600 bd FSK BBS  ON
> > TO31  436.925 145.925 5 J 9600 bd FSK DATA ON downlinks images
> > GO32  435.225         ? J 9600 bd FSK tlm  1 packet every 30 sec
> > SO35  145.825 436.290 8 B 9600 bd FSK data ON all non voice passes
> >                           1200 bd AFSK up  on the uplink is 7db better
> > SO35  435.250 145.825 4 J 9600 bd FSK      ON after 10 Oct?
> >               145.900 4 J 1200 bd AFSK up  ON after 10 Oct?
> > MYSAT 437.325 TBD     ? J 9600 bd FSK data ON
> >
> > * If you dont hear it, then DONT TRANSMIT!  Check your gear...
> >
> > Between the hours of about 6 AM to noon and 6 PM to midnight local SUN
> > time there is usually one of these birds in view for a few minutes to
keep
> > you entertained while traveling.  UHF requires +/- 5 or 10 KHz Doppler
> > tuning.  The "S" column is a subjective signal strength assessment.  A
> > 20" vertical whip in the center of your car roof  will give you success
as
> > shown below.  This acts as a 3/4 wave on UHF giving almost 8 dBi above
> > 30 degrees over a good groundplane for the UHF downlink birds (for the
> > cener 1/3rd of the pass).  For  SUNSAT which operates mode B with a
> > stronger 2m downlink and your 50 watt mobile uplink, a normal dual-band
> > mobile antenna will do better closer to the horizon.
> >                                                 SIG RECEIVE RANGE
> > USING THE 20" WHIP FOR MODE J PACSATS:          --- ------------------
> > As a rough approximation consider this table     9  Horizon to Horizon
> > which  I have subjectively  determined after     8  5  deg and above
> > 3 months  of daily monitoring. Home stations     7  10 deg and above
> > with 50' of RG 8  should subtract abt 3 from     6  15 deg and above
> > the signals and 5/8  or dual band, or "gain"     5  20 deg and above
> > antennas  should also subtract about 2.          4  25 deg and above
> >                                                  3  30 deg and above
> > The PACSATs  do not  officially digipeat  UI     2  3 ele beam required
> > packets,  but  you can still  see status and     1  6 ele beam required
> > telemetry and the USER lists on your Kenwood
> > data radios or any radio with 9600 baud TNC.  For more info on mobile
> > satellite operations see http://web.usna.navy.mil/~bruninga/astars.html
> >
> > NOTE:  The above assessments of the 20" whip were made with a .8 dB
> > NF preamp and 150 feet of coax.  OPerating recently mobile with the
THD7a
> > Handheld barefoot with no preamp did show a decrease in the amount of
pass
> > coverage.  This is because the THD7a is optimized for the 440 band in
the
> > USA, not the 435 Band where it is a few dB down there.
> >
> > Errors, omissions, corrections welcome.  I will re-post this when ever I
> > hear of changes in status.  For more detail, of course, read the AMSAT
> > News Service bulletins and AMSAT WEB pages http://www.amsat.org
> >
> > de WB4APR, Bob
> >
> >
> > ----
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> >
>
> ----
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