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 latestThe link to
the project page is
http://www.sedition.org.au/op25/wiki/SignalScopePage
Best Regards
Max