[op25-dev] Re: OP25 GRC - Almost but not quite working

rrgsti bobrich at gmail.com
Thu Apr 26 02:48:21 UTC 2012


Hi Andy,

I'm in the exact same boat.  Using the RTL2832U dongle for the radio, I honestly wasn't expecting this to work for some reason, but the data coming in looks like it's getting decoded a bit.  (I started this same question over on the RTL group but am going to try to solve it here as it may or may not have anything to do with the radio)

I've got two theories at this moment.

1 - Balint's gnuradio patches in gr-baz are required for this to work, and the patches may or may not have taken against the latest gnuradio pulled from git as of a week ago or so.  

2 - I'm having trouble getting all of the parts from the latest version of the OP25 project to build as well.  It looks like there are some stale references to 'decoders' which is now called 'blocks', and am thinking I might need to go back a few revs.  Something might be broken in there, preventing this from functioning as well.

Would either of these possibly apply in your case as well?

--- In op25-dev at yahoogroups.com, Andy Knitt <andyknitt at ...> wrote:
>
> It looks like imbe_decoder_factory.cc in OP25 defaults to
> 'software_imbe_decoder'.  I manually changed the IMBE environment variable
> to "soft" and confirmed it with printenv, but I'm still getting a flat line
> at the output of the OP25 block.  Any other ideas?
> 
> Thanks,
> 
> Andy
> 
> On Mon, Apr 23, 2012 at 11:47 PM, Balint <balint256 at ...> wrote:
> 
> > **
> >
> >
> > I *still* haven't checked out the latest code, but in my old code the
> > default voice frame output was (null?).****
> >
> > There are options for file output, null, external (hardware) decoder and
> > internal decoder. You used to be able to spec this on the command line as
> > an environment variable:****
> >
> > export IMBE=soft****
> >
> > I changed my default to be the internal decoder (see
> > `imbe_decoder_factory.cc').****
> >
> > ** **
> >
> > *From:* op25-dev at yahoogroups.com [mailto:op25-dev at yahoogroups.com] *On
> > Behalf Of *Andy Knitt
> > *Sent:* Tuesday, 24 April 2012 12:45 PM
> > *To:* op25-dev at yahoogroups.com
> > *Subject:* [op25-dev] OP25 GRC - Almost but not quite working****
> >
> > ** **
> >
> >   ****
> >
> > I have the OP25 GRC demo that Balint provided up and running.
> > Everything seems to working except I'm not getting any audio out of
> > the OP25 block. I'm getting the "four line" output from the dibit
> > output port when there is traffic on the channel, and the autotune
> > output is outputting data. However, no audio. I put a scope on the
> > audio output and it's a flat line at zero, even when the dibit output
> > is "four lines". Any tips on how to further troubleshoot?
> >
> > Thanks,
> >
> > Andy****
> >
> > ****
> >
> >  
> >
>


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