On Tue, 6 Dec 2005 16:04:07 -0800, Eric Blossom [EMAIL PROTECTED] wrote
To: [EMAIL PROTECTED], discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] gmsk error / log files and octave
On Tue, Dec 06, 2005 at 06:16:32PM -0500, [EMAIL PROTECTED] wrote:
> Probably the easiest thing is to modify gmsk_test.py and add code to
> write the signals you're interested in to files using gr.file_sink.
> That's how we debugged it.
>
> In gmsk_test.py, make main look like this: (untested, but probably
pretty close)
>
> fg = my_graph(rx_callback, options.spb, options.bt, options.snr,
options.freq_error)
> fg.connect(fg.packet_receiver.gmsk_demod.sub,
> gr.file_sink(gr.sizeof_float, "before_clock_recovery.dat"))
> fg.connect(fg.packet_receiver.gmsk_demod.clock_recovery,
> gr.file_sink(gr.sizeof_float, "after_clock_recovery.dat"))
> fg.start()
>
>
> Then after it runs, you can read the binary log files into octave and
> display them as you like.
> In your ~/.octaverc add (modify as required for your gnuradio build
directory):
> LOADPATH=":~/gr-build/gnuradio-core/src/utils";
> $ octave
> >>> before = read_float_binary("before_clock_recovery.dat", 4e6);
> >>> after = read_float_binary("after_clock_recovery.dat", 4e6);
> >>> plot(before(1:1000));
> >>> plot(after(1:1000));
This worked and I was surprized at the output of after_clock_recovery. It
was just a resampled at the data rate and still had what I consider noise
on it.
I tried to do the same for after the packet_sink but could not get it to
work.
fg.connect(fg.packet_receiver._packet_sink,
gr.file_sink(gr.sizeof_float, "after_packet_sink.dat"))
It gave me a port number out of range message.
What is the stream output after the packet_sink?
Mike
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