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John Ackermann N8UR jra@febo.com [op25-dev] op25-dev at yahoogroups.comThanks for the quick replies. Attached are: 1. trunk.tsv and the local talkgroup list montgomery.tsv 2. Screenshot of the console after starting, using -v 255. 3. Screenshots of spectrum, datascope, constellation, and traffic. Here is the command line I'm using: ./scope.py --args 'rtl' -f 853.5e6 -N 'LNA:35' -o 17e3 -V -v 255 -S 2480000 -q 0 -T trunk.tsv My RTL-SDR.com dongle seems to be just about on frequency; it has a TCXO. I've messed with PPM correction as well as fine tuning and, though I'm not sure just what I should be looking for, changing those in either direction tends to result in tuning error messages. I am not sure if Montgomery County is C4FM or CQPSK. Radio Reference seems to indicate C4FM; I've mainly used that, but tried CQPSK a couple of times with no "traffic" shown in either case. Thanks! John ---- On 06/09/2017 09:44 AM, 'wa8wg' wa8wg at centurytel.net [op25-dev] wrote: > John, > > You should normally get an error message when starting scope.py if your > trunk.tsv if your trunking system occupies more bandwidth than is > supported by the sample rate capability of your SDR. Maybe you could > post your trunk.tsv for a look see? However, it sounds like your > constellation doesn’t look the best. Is scope showing the P25 frames > being decoded and does it indicate any errors on those frames? I have > my op25/GNU Radio running on Ubuntu 14.04 virtualized in Oracle > VIrtualBox on my Windows 10 laptop. > > Bill, WA8WG > > William G. Becks, WA8WG > > N7027 Shady Lane Circle > > Porterfield, WI 54159 > > Telephone: 715.735.0131 > > E-Mail: wa8wg at centurytel.net <mailto:wa8wg at centurytel.net> > > *From:*op25-dev at yahoogroups.com [mailto:op25-dev at yahoogroups.com] > *Sent:* Friday, June 9, 2017 7:28 AM > *To:* op25-dev at yahoogroups.com > *Subject:* [op25-dev] OP25 setup once built > > Hi -- > > After looking at the archives, I think I may need to use a different > software branch, but here's where I stand: > > 1. Downloaded OP25 from the oscomcom site. > > 2. Built without any problems on Mint 17.04 with Gnuradio 3.7.11. > Computer is an i7 laptop with 8GB RAM. I'm using an RTL-SDR dongle for > now; I can try a USRP but wanted to start with the simpler hardware. > > 3. Cobbled up .tsv files for local P25 system (Ohio MARCS-IP, > Montgomery County site, C4FM). This site has 30 channels and the 2.4 > msps rate of the dongle can't catch them all, but I am covering the > control channel pllus several more channels. > > 4. Scope.py seems to run fine with all windows looking proper. > Selecting some tabs causes timeout errors on the console, but those stop > when I switch tabs.. > > 5. I seem to be tuned to the control channel (853.600) and see a > not-terrible constellation. > > 6. But I don't see any traffic decoding, much less get any audio (I > know that the 30 channels at this site are spread over a bandwidth > greater than the RTL-SDR dongle can provide; I can bring a USRP to the > game but for now would be happy just to decode control data. > > I'd appreciate any help, particularly on what the scope.py command line > should look like. And should I be using a version other than what is on > the Osmocom site? > > Thanks much, > > John Ackermann N8UR > jra at febo.com <mailto:jra at febo.com> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20170609/e0a7720d/attachment.htm>