[op25-dev] Re: GRC Flowcharts

Balint balint256 at hotmail.com
Sun Apr 8 01:06:32 UTC 2012


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 at yahoogroups.com [mailto:op25-dev at yahoogroups.com] On Behalf
Of allanjs1986
Sent: Sunday, 8 April 2012 10:43 AM
To: op25-dev at 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 at yahoogroups.com <mailto:op25-dev%40yahoogroups.com> , Balint
<balint256 at ...> 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 at yahoogroups.com <mailto:op25-dev%40yahoogroups.com>
[mailto:op25-dev at yahoogroups.com <mailto:op25-dev%40yahoogroups.com> ] On
Behalf
> Of allanjs1986
> Sent: Sunday, 8 April 2012 9:54 AM
> To: op25-dev at yahoogroups.com <mailto:op25-dev%40yahoogroups.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.
>



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