Edge of Space Sciences (www.eoss.org) in Colorado routinely flies high altitude balloons with multiple APRS beacons on the flight string for redundancy, etc.. ?Each of which is on a different 2m frequency and not on 144.39. ?
We¡¯re heavily leveraging this technique with GnuRadio to use a single RTLSDR dongle for listening to as many as 6-odd frequencies, pipe that audio over to direwolf via UDP ports, and have APRS packets come out the other end. ?;) ;) ?It works great and is the backbone of our tracking software that folks run on small industrial computers (think Kansung or other Chinese equiv) in their vehicles.
What makes it all go, however, is Direwolf and its ability to decode damn near anything. ?Many thanks to all of the Direwolf maintainers and to John, WB2OSZ. ?Without Direwolf, EOSS would still be DF¡¯ing!?
Happy to provide some GnuRadio flow graph examples if interested.
Thanks,
-Jeff
N6BA
P.s. ?EOSS has a flight tomorrow morning, 06:40 MDT Saturday 4/3, and one can watch it on www.aprs.if or on track.eoss.org (online version of the EOSS tracking software). ?Most of those packets get to APRS-IS through the GnuRadio+Direwolf connection. ? Go here for flight info (and what callsigns to track): ?.
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On Apr 2, 2021, at 3:37 PM, Tadd KA2DEW in NC via groups.io <tadd@...> wrote:
?
Yes! ? Wild. ? It¡¯s getting there!?
On Apr 2, 2021, at 4:59 PM, Dave Breiland (KI6ETL) <
dave@...> wrote:
I was just reading about this in the User Guide for Direwolf, in section "9.1.6.4 Gnu Radio ¨C multiple simultaneous channels".? That seems to be in the spirit of what you are trying to do?
