[aprssig] (no subject) -- should be Packet Recording

Rob Riggs mobilinkd at gmail.com
Fri Jun 10 19:06:44 CDT 2016


Hi John,

Thanks for doing this.  I've been recording packets off the air, which is
great for real world testing, but a bit of a pain when starting to work on
software for a new demodulator.  For that I typically have to create some
harness in GNU Radio or Python.  Having an independent tool that is direct
to digital helps immensely.  Makes it easy to feed into SciPy where I model
the code before converting it to C/C++.

Being able to output at arbitrary SPS with gen_packets is great because I
can produce the desired sample rate without resampling.  This is needed
because I tend to have odd ADC sample rates tuned for each data rate and,
for AFSK, tone frequencies.

gen_packets has been a very useful tool.  Thank you.

Kind Regards,

Rob Riggs WX9O
Mobilinkd LLC

On Wed, Jun 8, 2016 at 10:51 AM, John Langner WB2OSZ via aprssig <
aprssig at tapr.org> wrote:

> The "gen_packets" utility, included with the direwolf TNC package, is a
> flexible APRS packet generator.  The resulting audio is placed into a .WAV
> file rather than being sent out through the "soundcard."
>
> Options include:
> - data bits per second: 300 (HF AFSK), 1200 (default AFSK), 2400 (V.26
> style
> QPSK), 4800 (V.27 style 8PSK), 9600/19200/38400 (K9NG/G3RUH), or other
> arbitrary speed.
> - default standard or custom mark/space tones for AFSK.
> - number of audio samples per second.
> - gradually increasing random noise to test demodulator performance with
> poor S/N ratio.
>
>
>
>
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> aprssig at tapr.org
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