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<p>Hi Keith<br>
<br>
This would be very helpful! We don't currently have a lot of hard data on how "phase 2" systems work. AFAIK the top thing on the wish list would be a voice channel capture (when the channel is transmitting in phase 2 / TDMA mode). Supposedly only the GRE PSR-800 scanner can receive this mode.<br>
<br>
The capture should be in complex format - the sample rate should probably be at least 96,000, higher rates no problem.<br>
<br>
As long your hardware is supported by GR you should be able to use the usrp_rx_cfile or uhd_rx_cfile app (or equiv). to do the signal capture... Mostly, the only other thing when capturing is to make sure the RF front end gain is set optimally - there are GR apps such as uhd_fft and usrp_fft for scoping signals, helpful to get a bearing on things...<br>
<br>
Best<br>
<br>
Max<br>
<br>
--- In <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a>, Keith S <ktsangel69@...> wrote:<br>
><br>
> I'm not much of a coder but I can assist in taking captures of a p25 phase II system. There is a site near me.<br>
> <br>
> I have a gnuradio setup using rtlsdr dongles. Let me know how and what you would like me to capture. There are audio channels and a Motorola trunking control channel on this site. I've done some basic decoding of the control channel with some windows apps already but haven't tried anything with gnuradio yet.<br>
> <br>
> Keith <br>
> <br>
> ikj1234i <ikj1234i@...> wrote:<br>
> <br>
> ><br>
> ><br>
> >Hello Stevie<br>
> ><br>
> >Good to hear from you - this sounds like a good idea, for sure.<br>
> ><br>
> >It's always tempting to take such an opportunity as this to rewrite the entire system from scratch :)<br>
> ><br>
> >I think another piece to add to the puzzle that perhaps might be broken out as a separate item of concern would be UHD support. <br>
> ><br>
> >Mostly I think that would affect our py code but not so much our C++ blocks.<br>
> ><br>
> >Also when you added the fsk4 demod block to the op25 core it took me longer than it should but as of a few days ago I checked in several remaining stragglers to svn, all of our py code is now upgraded to use the in-tree version. I think there may have been one or two _very_ old ones that still use Franks' p25 and RD-LAP protocol handlers, but those apps date back to the days before our project had its own protocol processing...<br>
> ><br>
> >Also for GR 3.6 in addition to cmake there is a new directory structure that apps are to conform to.<br>
> ><br>
> >Looking further out there is some very exciting new stuff coming in GR for handling packet-oriented streams with timed transmission features. This looks like it should be a good fit for our repeater work, but will require effort to make use of the new capability. <br>
> ><br>
> >Finally, we're interested in P25 phase II, and are looking for RF captures of various phase II scenarios.<br>
> ><br>
> >Best<br>
> ><br>
> >Max<br>
> ><br>
> >--- In <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a>, Steve Glass <stevie.glass@> wrote:<br>
> >><br>
> >> Hi Everyone<br>
> >> <br>
> >> I think its time to organize a drive to move the code to the latest version<br>
> >> of GNURadio. The OP25 codebase is suffering badly from bit rot and that<br>
> >> needs fixing. GNURadio has evolved and developed many new features we've<br>
> >> not properly kept up with. Fixing the codebase will mean that we can get<br>
> >> people working with much less hassle than at present.<br>
> >> <br>
> >> I've created a wiki<br>
> >> page<<a href="http://op25.osmocom.org/wiki/wiki/ReengineeringPage">http://op25.osmocom.org/wiki/wiki/ReengineeringPage</a>>to act as the<br>
> >> starting point. I shall start opening tickets this week and<br>
> >> start mapping out the direction of the exercise. For now I want to focus<br>
> >> the effort on the core OP25 components and we can use GRC as our top-level<br>
> >> test harness. Take a look and take part in the discussion.<br>
> >> <br>
> >> Atb<br>
> >> <br>
> >> Steve<br>
> >><br>
> ><br>
> ><br>
> ><br>
> ><br>
> >------------------------------------<br>
> ><br>
> >Yahoo! Groups Links<br>
> ><br>
> ><br>
> ><br>
><br>
<br>
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