[aprssig] Another APRS satellite (9600 baud)

Robert Bruninga bruninga at usna.edu
Mon Oct 2 12:14:26 CDT 2017


That is it.  And we will need IGatess that ignore the full 9600 baud stream
and only pass the APRS packets to the IS.

bob



*From:* aprssig [mailto:aprssig-bounces at tapr.org] *On Behalf Of *Lynn W.
Deffenbaugh (Mr)
*Sent:* Monday, October 02, 2017 12:30 PM
*To:* TAPR APRS Mailing List
*Subject:* Re: [aprssig] Another APRS satellite (9600 baud)



Would that be the Falconsat-3 ID 30776?  Or a different Falconsat?

Lynn (D) - KJ4ERJ - Operator of SATSRV

On 10/2/2017 11:01 AM, Robert Bruninga wrote:

Looks like Falconsat passes (4) are coming over Northern mid latitudes from
about 10 AM to around 1600 local Daylight time.



Just listened today, and it has a solid continuous 9600 baud downlink from
horizon to horizon.  If you are running WISP then your file system will
fill with the data files.



But just running my TM-D710G in APRS mode, it received dozens of UI
packets.  I could see the callsigns, but since they were not APRS protocol,
they just blinked with the ?? for unknown.  But my APRS packet was
digipeated a few times.  If there had been other APRS users on the uplink,
then I would have seen them.



BUT PLEASE.  RECOGNIZE that APRS UI packets are NOT what this satellite was
designed for.  So test your system, understand how it works, be ready if
you need to send emergency packets or make some contacts, but PLEASE do not
just beacon randomly.  It screws up the FILE SERVER protocol for those
other users.



And NEVER beacon unattended.



And we need some IGATES to be monitoring and feeding the APRS-IS, BUT ONLY
APRS PACKETS.  The APRS-IS feed cannot possibly handle full stream
continuous 9600 baud downlink.



How are we going to do this?

Thanks



Bob, WB4aPR





*From:* Robert Bruninga [mailto:bruninga at usna.edu]
*Sent:* Sunday, October 01, 2017 1:43 PM
*To:* TAPR APRS Mailing List
*Cc:* Robert Bruninga
*Subject:* Another APRS satellite (9600 baud)



The Airforce Academy turned over its Falconsat satelliite to Hams and I
had not realized it supports APRS digipeating.  But at 9600 baud and cross
band.



This is a great bird to get some experience on operating 9600 baud.

https://www.amsat.org/falconsat-3/



435.103 MHz down and 145.840 up DIGI call of PFS3-1.  While of course
setting 5 memories to chase the Doppler the full 20 KHz during the pass.



I guess we need some APRS IGates to collect packets on the downlink.  Of
course this is not easy because the doppler shifts through 5 channels at 5
KHz steps due to DOppler.  But if we have enough passive receivers all over
the USA  Then one of them will always be in the passband for at least some
packets.

Just tune in 435.110 which is 7 KHz high and you will at least hear the
start of the pass and if you are in the shack, you can then follow it down.

Bob, WB4APR




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