[op25-dev] Re: In need of signal samples

souf308 souf308 at yahoo.com
Sun Mar 31 23:22:00 UTC 2013


OK I think I actually found out how to use the info file. But I still need some help to configure the parameters in the OP25.grc and use the samples (sorry to bother you with those beginners questions)
----------------------------
Here is the info file (from the website)
(dp0
S'capture-rate'
p1
I250000
sS'source-decim'
p2
I256
sS'source-dev'
p3
S'USRP'
p4
sS'center-freq'
p5
F434075000.0
s.
---------------
So 
* 'capture-rate' corresponds to the parameter 'samp_rate' in grc file
hence samp_rate=250000

* 'center frequency'=434075000.0

*but what about 'channel_rate'? (=250000?)

*In this formula (channel_rate/(2.0 * math.pi * op25.SYMBOL_DEVIATION)) what is op25.SYMBOL_DEVIATION???

*what is samp_per_sym??

Thanks in advance for you help

Souf

--- In op25-dev at yahoogroups.com, "souf308" <souf308 at ...> wrote:
>
> Hi,
> I'm still working in the theoretical part before that I use an USRP so I need a signal sample too.
> Is it from this page that you took it?
> http://op25.osmocom.org/trac/wiki.png/wiki/SamplesPage
> 
> You just have to put it in the filesource section to use it right?
> What I don't understand is how you configure the following sections (like the center frequency etc..) and how the .dat.info file is suppose to help you (i's like there are almost no information inside the file)?
> 
> Thanks in advance for your awnsers
> 
> Souf
> 
> 
> --- In op25-dev at yahoogroups.com, <md123@> wrote:
> >
> > 
> > ---- Steve Glass <stevie.glass@> wrote: 
> > > Ok, I've fixed up the link to the samples so there's one capture up there
> > > right now. I'll upload other samples if people send me the link tellling me
> > > where I can upload them from. Of course, we want them compressed using
> > > bzip2 first ;-)
> > > 
> > > 
> > Thanks a bunch Steve, big help!  I have been able to get he signal on the scopes but unable to hear any sound.  Do you have any ideas about what may be wrong here?
> >
>


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