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Hey everyone, Here's what we needed to know about the new NOAAport signal and its characteristics, for the new feed starting next month. Note carefully, and I have a few opinions/comments at the end. NOXX01 KWBC 031346 WHAT - SBN/NOAAPORT EXPANSION AND HARDWARE UPGRADE DATE - MARCH 03 2011 NOTICE - 003 -------------------------------------------- UPDATE OF NOTICE 002 TO IDENTIFY NEW NOAAPORT SBN LINK BUDGET PARAMETERS AND CHARACTERISTICS -------------------------------------------- -------------------------------------------- PLANNING DATES 1. PLANNED IMPLEMENTATION DATE - APRIL 18 2. DUAL ILLUMINATION DATES - APR 18 TO MAY 17 3. DECOMMISSION OLD DVB-S DOWNLINK - MAY 17 -------------------------------------------- THE AWIPS PROGRAM OFFICE IS CONTINUING WITH ITS PLANS TO EXPAND THE BANDWIDTH OF THE AWIPS SATELLITE BROADCAST NETWORK SBN/NOAAPORT FEED FROM 10.24 MBPS TO ABOUT 30 MBPS IN MAY 2011. AS PART OF THIS EXPANSION, THE SBN/NOAAPORT SIGNAL WILL BE TRANSITIONED FROM THE CURRENT DVB-S STANDARD TO A MORE EFFICIENT DVB-S2 STANDARD. TODAY, THE NWS AWIPS PROGRAM IS RELEASING THE NEW NOAAPORT SBN LINK BUDGET PARAMETERS AND CHARACTERISTICS DATA FOR ALL CUSTOMERS IN SUPPORT OF THIS TRANSITION. ------------------------------------------ NEW NOAAPORT SBN LINK BUDGET PARAMETERS AND CHARACTERISTICS ------------------------------------------ DATA RATE.................................30240 KBPS MODULATION PHASES.........................8 CODING RATE...............................2/3 SATELLITE.................................SES-1 TRANSPONDER INPUT BACKOFF.................7.0 DB TRANSPONDER OUTPUT BACKOFF................4.0 DB ATTENUATOR SETTING........................14 DB CARRIER TO INTERFERENCE RATIO.............16.0 DB TRANSPONDER USABLE BANDWIDTH..............36 MHZ FADED SYSTEM MARGIN.......................1.0 DB UPLINK SITE-MASTER GROUND STATION.........HAUPPAUGE, NY TRANSPONDER CENTER FREQUENCY..............6225 MHZ TRANSMIT EIRP.............................68.8 DBW FREE SPACE PATH LOSS......................199.9 DB UPLINK RAIN MARGIN........................1.0 DB SATURATED SATELLITE FLUX DENSITY..........-98.2 DBW/M2 EFFECTIVE SATELLITE FLUX DENSITY..........-84.2 DBW/M2 UPLINK FREQUENCY..........................6233 MHZ DOWNLINK FREQUENCY........................4008 MHZ DOWNLINK POLARIZATION.....................VERTICAL NWS WFO DISH - CONUS EXCLUDING FRINGE.....TWO SIZES ..........................................3.7 METER ..........................................3.8 METER NWS WFO DISH - CONUS FRINGE...............4.5 METER NWS WFO DISH - AK, HI, AND PR.............7.3 METER UPLINKS DISH - MGS - GLOBECOMM............9.3 METER UPLINKS DISH - BMGS - FAIRMONT, WV........7.3 METER ------------------------------------------ NOTE 1 - CONUS FRINGE INCLUDES GULF COAST REGION, PARTS OF FLORIDA AND MAINE ------------------------------------------ NOTE 2 - DATA CAN ALSO BE FOUND AT THE URL BELOW WWW.WEATHER.GOV/NOAAPORT/HTML/NOAAPORT.SHTML ------------------------------------------ ------------------------------------------------------------ OK, Gilbert again. First of all, the current NOAAport feed has a power of 59.2 dbW from SES-1; the new one has 68.8 dbW. That's a significant power increase of 10 dbW. And I think that is where NOAAport is right now (68.8 dbW). That is currently allowing even those with 3 meter dishes to get a clean feed of NOAAport in northeastern Illinois. Secondly, Jose Nieves and I have MEASURED a roughly 2-3 dB increase (closer to 3 dB) in sensitivity for the Novra S-200 receiver over the S75 and S75+. The gain is at least 1 dB higher with the older S75 model, as a firmware upgrade increased the receive margin of the S75+ by about 1 dB two years ago with a firmware upgrade. Furthermore, DVB-S2 in this modulation scheme offers forward error correction for the first time that improves the quality by roughly 1-2 dB. I say all of that to say this. It may be worth the time if you have a spare 3 meter dish lying around in the central and eastern U.S. to see if you can get the signal adequately. With that "much" power coming from the bird, a sensitive receiver, and forward error correction... a 3 meter dish from Colorado to Illinois to Virginia to Florida to Texas to Colorado may be adequate enough to get NOAAport nearly all of the time (the southern U.S. will have more rain fade, obviously, especially in spring/summer). The Novra S-300 is a souped-up S-200 with additional circuitry, with no changes to the receiver itself (just the decoding portion of it is changed).Anyway, that's interesting stuff. The next two months are going to be very interesting with the big NOAAport change/upgrade.
******************************************************************************* Gilbert Sebenste ******** (My opinions only!) ****** Staff Meteorologist, Northern Illinois University **** E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx *** web: http://weather.admin.niu.edu ** *******************************************************************************
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