[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?
>
> Thanks
>
> 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.
>
> 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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