Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
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: NOXX01 KWBC 181358 WHAT - SBN/NOAAPORT EXPANSION AND HARDWARE UPGRADE DATE - APRIL 18, 2011 NOTICE - 007 -------------------------------------------- SBN ACTIVATION INFORMATION - APRIL 18 2011 -------------------------------------------- THE NEW -SBN/NOAAPORT- SIGNAL WAS ACTIVATED AS OF 04/18/11 - 1300Z. -------------------------------------------- NOTICE-NOTICE-NOTICE-NOTICE-NOTICE-NOTICE -------------------------------------------- DUE TO UNEXPECTED INTERNAL PROCESSING PROBLEMS ENCOUNTERED OVER THE WEEKEND, THE OPERATIONAL DEPLOYMENT HAS BEEN PLACED ON HOLD BY THE NWS TILL FURTHER NOTICE. THE DUAL ILLUMINATION WILL CONTINUE AT THIS TIME, BUT WE ARE ENCOURAGING OUR CUSTOMERS TO ONLY USE THE DVB-S2 SIGNAL FOR TESTING PURPOSES TILL A RESOLUTION FOR THE PROBLEMS ENCOUNTERED THIS WEEKEND HAVE BEEN ADDRESSED. IF YOU ENCOUNTER PROBLEMS OR HAVE QUESTIONS, PLEASE REPORT THE PROBLEM TO THE NOAAPORT SUPPORT TEAM /SEE EMAIL ADDRESS BELOW/. ... IF YOU HAVE ANY QUESTIONS, WE ENCOURAGE YOU TO CONTACT US VIA EMAIL AT THE FOLLOWING ADDRESS NWS.NOAAPORT -AT- NOAA.GOV Like everyone else testing DVB-S2, we are eager to see a resolution of this problem! Cheers, Tom -- +----------------------------------------------------------------------------+ * Tom Yoksas UCAR Unidata Program * * (303) 497-8642 (last resort) P.O. Box 3000 * * yoksas@xxxxxxxxxxxxxxxx Boulder, CO 80307 * * Unidata WWW Service http://www.unidata.ucar.edu/* +----------------------------------------------------------------------------+
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