1200 baud ax.25 can easily be implemented in hardware or software today.
Hence its popularity. And there are radios with the protocol and arguably
the most popular application (APRS) implemented directly. Kenwood was the
first to push a radio with an AX.25 terminal node controller embedded, with
By far the most common APRS RF mode is 1200 baud AFSK, but 9600 baud FSK
also exists as a faster and slightly more modern option. There's a
decent, but not great, number of repeaters and internet gateways in
place for the 9600 some radios support both.
On 12/08/2020 13:36, Adrian Musceac
Hey Derek
Thank you for this wonderful description
https://matheo.uliege.be/bitstream/2268.2/6751/1/OUFTI2-COMM-Piron-2019.pdf
This covers all my basic doubts regarding G3RUH mode.
Thanks and Regards
Yugal Joshi
On Wed, 12 Aug 2020 at 17:42, Derek Kozel wrote:
> Hi Yugal,
>
> gr-ax25 was
Hello Marcus
Thank you for your explanation
Also thanks for introducing me with protocols
I learned from the documentation and your explanation that the AX.25
protocol lacks the ability to correct errors and is not optimized to
operate with the noisy channel.
I am very excited to read about
Hi Derek,
Isn't APRS 1200 baud though? 9600 baud packet is quite uncommon nowadays here,
historically it was used for BBS access.
I'm also interested in this APRS transceiver.
Best,
Adrian
On August 12, 2020 12:12:09 PM UTC, Derek Kozel wrote:
>Hi Yugal,
>
>gr-ax25 was just updated this month
Hi Yugal,
gr-ax25 was just updated this month to start supporting the development
version of GR 3.9 and if you look one commit back it is is compatible
with 3.7, so it does look like it's skipping 3.8. Still, it's a valuable
reference for you as you look to create your own implementation.
Hi Yugal,
well, 2-FSK is relatively easy to demodulate, and you'll probably also
be able to use the existing synchronizer blocks to symbol timing- and
frequency-synchronize.
What will definitely require writing code is handling the ax.25 frame
format.
You **should** look at gr-ax25 (it's
Hey Volker
I understand there are ways to implement it using direwolf.
I am more concern to solve this problem with GRC and mostly with its core.
Can you help me in figuring out the procedural steps to be taken to
implement a receiver in GRC to decode a signal with G3RUH mode Ax25 and
2FSk
The master branch is for gr3.9, but there is a gnuradio 3.8 branch
Another good starting point for ax.25 could be wb2osz/direwolf on github.
— Volker
>> Am 12.08.2020 um 06:31 schrieb Yugal Joshi :
>
> Hello Jeff
> Thanks for replying
>
> From what I learned in last two days in GNU
Hello Jeff
Thanks for replying
>From what I learned in last two days in GNU Radio, it looks like gr-25 is
an OOT module.
gr-25 works with GR 3.9 and pybinds and I am using GR 3.8.1.0.
Also I want to implement G3RUH 2FSK AX25 using the core modules of GRC or
programming new OOTs so that I can
Have you already take a look at this?
https://github.com/dl1ksv/gr-ax25
On Tue, Aug 11, 2020 at 4:13 PM Yugal Joshi
wrote:
> Hello all
> I am new to the GNU Radio community.
> I am starting an effort to implement a receiver using GNU Radio for the
> amateur radio whose transmitter operates in
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