While all of this has been mentioned previously on our op25-dev list, I'd like to take this opportunity (from the GR 2011 Conference in Philadelphia, Penna.) to announce a couple of sub-projects which could be put off forever (nothing is ever truly "finished" ;-) but nonetheless would benefit from wider examination and comment, especially at this time...
First is our integration with Asterisk (VOIP), specifically their app_rpt project to provide a rich set of repeater semantics (to include NBFM with CTCSS and P25). Targeted features working today are:
- Simultaneous multi-channel transmission/reception
- Uses USRP and/or conventional receiver/transmitter hardware
- Generic interface to Asterisk via app_rpt (full VOIP, radio
control, and standard repeater functions)
- Features: P25, analog NBFM with CTCSS
- Expected to be fully "ROIP" [Radio Over IP] compatible
For details on the repeater stuff please visit
http://www.sedition.org.au/op25/wiki/RepeaterPage
Second is an enhanced version of our signal visualization and analysis app which features:
- Spectrum plot
- Baseband oscilloscope
- Eye Pattern Diagram (Datascope) display supporting several
standard symbol rates
- Constellation Diagrams
- Demodulated Symbol Output
- Correlation (including Fast Auto-Correlation)
- Direct-frequency entry, signal gain and fine-tuning controls
- User-selectable demodulator (FSK4 or QPSK)
A goal for the app is to accommodate a range of targets:
- Choice of USRP, discriminator-tap, or "audio-IF" hardware modes
- Supports either GL or non-GL display mode
- Lower and middle range PC hardware, not just the latest
The link to the project page is
http://www.sedition.org.au/op25/wiki/SignalScopePage
Best Regards
Max