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AX.25

C2

C2

Sr. Member
Aug 3, 2005
2,408
83
158
I think that is the protocol for APRS.

I'm interested in the RF end of it. Does it modulation various tones and how to decode them?

I know a TNC or soundard can, but I want to build my own decoder, so I need to know exactly what is happening.
 

The AX.25 specification itself, for the data format transmitted can be found at tapr.org As for the hardware or software design to do the demodulation of the audio signal, I believe they have books they sell describing that.

A better bet may be the open source software in linux that deals with ax.25 and the 'soundmodem' modules, either the kernel module or the user space soundmodem utility.
 

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  • @ BJ radionut:
    +1
  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.


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