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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
On Thu, 21 Apr 2011, Tom Yoksas wrote:
Hi Gilbert, et. al., A quick update on DVB-S2 testing here at the UPC... We received and installed our Novra S300 receivers on this past Tuesday, April 19. We configured one of the receivers for DVB-S use and the other for DVB-S2 use. Two of the three NOAAPort reception machines we operate here in Boulder remain ingesting the DVB-S datastream and powering (along with other community machines) the IDD. The third system is ingesting the DVB-S2 datastream and feeding all of its data to a UPC test machine on which all data are being decoded by McIDAS-XCD decoders. Our experience so far is that the quality of the data being delivered by the DVB-S2 broadcast is measurably worse than that delivered by the DVB-S datastream meaning that we are seeing lots of Gap messages and missing lots of products. rtstats comparisons of the two datastreams can be made by viewing the 'volume' and/or 'products' links for machines ingesting each type of broadcast: DVB-S http://www.unidata.ucar.edu/cgi-bin/rtstats/siteindex?jackie.unidata.ucar.edu DVB-S2 http://www.unidata.ucar.edu/cgi-bin/rtstats/siteindex?burns.unidata.ucar.edu The reception quality as indicated by Novra 'cmcs' output on our DVB-S2 machine is good: CMCS 192.168.1.20> show satellite Satellite Interface Settings: Receiver MAC Address: xx-xx-xx-xx-xx-xx Receiver Mode: DVBS2 Frequency: 1142.0 MHz Symbol Rate: 15.120 Msps (Auto) ModCod: 2/3 8PSK Gold code: 0 Input Stream Filter: On Input Stream ID: 13 Signal Lock: On Data Lock: On Uncorrectable Rate: 0/Second Packet Error Rate: 0.0000e+00 Carrier to Noise C/N: 15.3dB Signal Strength: -46 dBm CMCS 192.168.1.20> This coupled with the large number of Gap messages we are seeing suggests that there are (still) problems with DVB-S2 uplink system. This agrees with comments made in a previous announcement by NOAA: Like everyone else testing DVB-S2, we are eager to see a resolution of this problem!
Yessir. My stats page is now back up: http://noaaport.admin.niu.edu:/8025If you want a look and see what my stats are with the new broadcast. I just installed the new version of this software to support it, but data will be populating through this afternoon. It's still useful now,
obviously. ******************************************************************************* Gilbert Sebenste ******** (My opinions only!) ****** Staff Meteorologist, Northern Illinois University **** E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx *** web: http://weather.admin.niu.edu ** *******************************************************************************
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