[aprssig] Another APRS satellite (9600 baud)
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Mon Oct 2 11:30:24 CDT 2017
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?
> Bob, WB4aPR
> *From:*Robert Bruninga [mailto:bruninga at usna.edu
> <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.
> 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
> aprssig mailing list
> aprssig at tapr.org
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