[chbot] gnu radio

[Richard Jones]

On Tue, Aug 27, 2013 at 12:42 PM, Volker Kuhlmann
<list0570 at paradise.net.nz>wrote:

> On Tue 27 Aug 2013 07:47:56 NZST +1200, Richard Jones wrote:
>
> > After the meeting Volker and I got chatting about gnu radio. Its a great
> > tool for knocking up a quick or sometimes not so quick signal processing
> > applications. The gnu radio companion software provides a graphical front
> > end to make a lot of jobs really simple.
>
> Sounds very useful indeed.
>
> > http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGR
>
> Installing should only be a few mouse clicks these days,
> openSUSE users type in rpm:gnuradio into konqueror and use the 1-click
> install.
>
> > There are lots of tutorials to get you started.
>
> Splendid, but I only had a brief look at the package. First impression
> is that it requires a lot of time to get good use out of it.
>
> > For software defined radio receivers the RTL2832 dongles for about $14US
> > are a great place to start.
>
> The software is obviously geared towards making existing suitable radio
> hardware work as a radio. Can it equally be used just as a signal
> processing toolbox for getting some C code for the filter chain designed
> with it?
>
Yes, gnuradio is aimed at the radio community so it has capacity to spare
for your LF application. My sample rate starts at 960ksps. You could run
all your sample rates at 8ksps, A rate that is an integer multiple of the
symbol rate is often handy.
Many filters can be designed by gnu radio for you at run time by
configuring the filter properties.
Drag the desired filter onto the gnuradio-companion screen eg
Filter,Bandpass, right click the properties fill in what you want.
ie ID,FIR Type, Interpolation, Sample Rate, Low cutoff Freq, High cutoff
freq, Transition Width, Window, Beta.
To add 'c' code for your specialised decoder follow the 'OutOfTree'
tutorial and add your own code to the work function.
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules
There are also lots of blocks for debugging and GUI.

Thanks for the tip,
>
> Volker
>
> --
> Volker Kuhlmann
> http://volker.dnsalias.net/     Please do not CC list postings to me.
>
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