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Re: afsk ax.25 transmission using gnu-radio 3.8

From: Daniel Estévez
Subject: Re: afsk ax.25 transmission using gnu-radio 3.8
Date: Tue, 31 Aug 2021 19:40:31 +0200
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Hi Bryan,

I think there are some problems with your flowgraph.

Most of what you have in there assumes 48 ksps, but you're using 192 ksps in some places. Probably it will be easier to use 48 ksps everywhere and then interpolate immediately before sending to the USRP.

Also, I don't understand why you're sending real instead of complex data into the USRP.


El 31/8/21 a las 9:55, bryan escribió:
Hi Dani,
   Thank you for your email. I have a USRP B200 and I want to use it to send APRS data using AX.25. I tried to use your example but somehow it does not seem to work. Is it ok if you can check what I did and tell me if this is correct or not?


    Thank you very much.


On Sun, Aug 29, 2021 at 3:15 AM Daniel Estévez <daniel@destevez.net <mailto:daniel@destevez.net>> wrote:

    Hi all,

    Maybe this example is useful:


    It uses in-tree blocks and a couple blocks from gr-satellites to
    implement an 1k2 AFSK AX.25 transceiver using the soundcard.



    El 27/8/21 a las 17:02, Paul Atreides escribió:
     > Hi Bryan. I used gr-bruninga quite a bit a few years ago (when I
    was still in GNURadio  3.7).
     > I’ve been working on porting the modulator portion over as a side
    project, but this package was really old even when three 3.7 was
    current so some of the internals are very different than the current
    state. My suggestion would be to get familiar with developing your
    own blocks using gr-modtool. That particular project was all Python,
    so this would be a great place to learn if you don’t know already
    how to make A new module and add blocks to it.
     > Perhaps we could work on this together, I think it would be
    really useful for the community!
     > Please feel free to reach out off the list and we can discuss. If
    you’re not familiar already with GNURadio I would suggest going
    through the tutorials for creating your own blocks in order to get
    comfortable with it first.
     > <end transmission>
     >> On Aug 27, 2021, at 04:03, bryan <bryanp80@gmail.com
    <mailto:bryanp80@gmail.com>> wrote:
     >> Hi,
     >>     Does anybody know of a library that can be used transmit
    APRS data using ax.25 for gnu-radio 3.8? The library that I have
    found, like gr-bruninga, will only install on gnu-radio 3.7.
     >>     Please help.
     >>    Thank you.
     >> Regards,
     >> Bryan

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