[aprssig] Another APRS satellite (9600 baud)
bruninga at usna.edu
Mon Oct 2 11:01:07 EDT 2017
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
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?
*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
This is a great bird to get some experience on operating 9600 baud.
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
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.
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