Nice! Thank you. 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Wed, May 24, 2023 at 3:21 PM Chris Thompson via pacsat-dev < pacsat-dev@amsat.org> wrote:
No, this is now setup with the expected frequencies (I think, correct me if it is wrong). It is listening on 2m and transmitting on 70cms. You can use either 1200 or 9600bps packet. It defaults to 1200 as I remember but your choice is remembered in MRAM if you change it.
The PB and Uplink are disabled initially I think. You need to enable them with the commands: PB open Uplink open
73 Chris
On Wed, May 24, 2023, 14:43 Burns Fisher (AMSAT) wb1fj@fisher.cc wrote:
So just to clarify, this is using 2m both up and down? 73,
Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software*
On Wed, May 24, 2023 at 11:37 AM Chris Thompson via pacsat-dev < pacsat-dev@amsat.org> wrote:
I just pushed my latest code to main. This has a working version of the AX25 Data Link State Machine. You can see the code in AX25Task.c. If you try to upload a file it will appear to work, with the ground station saying it was uploaded correctly. All of the packets are received and Ack'd by PACSAT, but the Uplink state machine is not yet storing them in a file. I still need to write that part.
To trigger the ground station you need to transmit the status of the uplink by typing: send uplink status
This is also using 2m as the receive frequency. Thanks to work by Jim, I have set this to use GFSK with BT=0.3. BT is the shape of the bit shaping filter. The filter may not be applied on receive, but setting it to GFSK vs GMSK makes a big difference. It now receives well on 2m at 9600bps. There is an errata from ON SEMI that says to use BT=0.3 vs BT=0.5 for transmit.
I have also implemented a mode change command. You can type these commands in the console: set rate 1200 set rate 9600
These will set the radios to the specified data rate. You need to restart the processor to apply it. We can probably just restart the radios, but that was a quick way to implement this for testing.
73 Chris
-- Chris E. Thompson chrisethompson@gmail.com g0kla@arrl.net
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Burns Fisher (AMSAT)