[op25-dev] difference between op25.decoder_bf and op25.decoder_ff

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Steve Glass stevie.glass at gmail.com
Fri Mar 23 00:49:07 UTC 2012


I've just got a funcube myself and just this morning support for it made it
into the GNURadio trunk. That should make using them lots easier. I am
looking forward to seeing the DVB-T support get done because that will make
using SDR *much* cheaper (23USD delivered!).

The question you ask concerns the interface to the decoder... the _ff
version has float inputs and outputs and the other takes bytes (actually
two-bit symbols) inputs and float outputs. The latter needs a slicer before
it but that is conceptually the right thing to do and so the _ff version is
deprecated. Hope that helps.


On 23 March 2012 07:48, bdapriv01 <bdapriv01 at gmail.com> wrote:

> **
> Hi
> Whats the difference between these 2?
> I'm new to Gnuradio & python to be honest; I'm writing my own ap25
> listener for the funcube...
> So far, I've got my software tuning, FM decoding, and then sending data
> into the FSK4 decoder; I can see it fine tuning.. but I don't get anything
> out of the decoder_bf function.
> Is there any easy way, to debug what its doing??
> Digging around in code there doesn't seem to be much debugging.
> I did create some network sinks, and forward the output of the FM demod to
> a a scope inside gnuradio companion.. the signal looks like FSK4 with the
> funky phase changes.
> Sean
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