OK last thing:
The ‘channel_rate’ Variable Value needs to be set to the sample rate seen at the OP25 Decoder block. If you’re going direct, then it should be the same rate as the Audio Source.
If you wish to try resampling to have an exact multiple of the FSK4 symbol rate, set ‘channel_rate’ to some multiple of it (e.g. I use 28800), and then between “Audio Source” and “Decimating FIR Filter” add a new “Rational Resampler”, but you need to going into its properties and make it (Float -> Float (float taps)).
Then enter the decimation to be your incoming sample rate (i.e. what’s at the audio sink) and then interpolation as literally ‘channel_rate’. So this is exactly what’s in the sample with the Rational Resampler, but it’s the orange float kind (not blue complex).
Hope that makes sense!
From: op25-dev@yahoogroups.com [mailto:op25-dev@yahoogroups.com] On Behalf Of allanjs1986
Sent: Sunday, 8 April 2012 10:43 AM
To: op25-dev@yahoogroups.com
Subject: [op25-dev] Re: GRC Flowcharts
Cool thanks why is my screen full of errors lol?
[IMG]http://i39.tinypic.com/23krl0h.png[/IMG]
--- In op25-dev@yahoogroups.com, Balint <balint256@...> wrote:
>
> Hi again!
>
> I've added the FM and OP25 GRC flowgraph files to gr-baz/samples so you can
> update your local copy and they should appear.
>
>
>
> From: op25-dev@yahoogroups.com [mailto:op25-dev@yahoogroups.com] On Behalf
> Of allanjs1986
> Sent: Sunday, 8 April 2012 9:54 AM
> To: op25-dev@yahoogroups.com
> Subject: [op25-dev] GRC Flowcharts
>
>
>
>
>
> Yes me again haha :-)
> I thought it might be a good idea for the less advanced in the group (like
> me) and others, for members to save there flow chart files in the files
> section. Like a P25 decode flowchart, using the gr-baz project. FM
> Demodulation and any other that may be useful.
>
