Change to TBUSnn KWBC Predict Bulletin

The following permanent changes have been made.

     (1) PART IV OF THE TBUS BULLETIN BEGINS WITH 5 LINES OF CODED
  INFORMATION FOLLOWED BY PLAIN LANGUAGE INFORMATION CONCERNING
  SATELLITE OPERATIONS.  WITHIN THE PLAIN LANGUAGE SECTION IS
  INFORMATION ABOUT THE ONBOARD SPACECRAFT TIP CLOCK CORRECTION.

     AN EXAMPLE OF THE CURRENT CLOCK CORRECTION INFORMATION FOLLOWS:
  LAST TIP CLK CORR 12/31/95 CLK ERR AFTER CORR MINUS 0.1 SEC.
  CLK ERR AS OF 04/15/96 PLUS 0.20 SEC.  ERR RATE AS OF 04/01/96
  PLUS 2 MS/DAY (ESTIMATED).  NEXT CLK CORRECTION 08/20/96.

     AN ADDITIONAL CODED LINE
  CONTAINING THE TIP CLOCK CORRECTION INFORMATION WILL BE ADDED
  TO PART IV PRIOR TO THE PLAIN LANGUAGE SECTION.  THIS LINE
  WILL HAVE 6 ALPHANUMERIC FIELDS CODED AS FOLLOWS:
       MMDDYY - MONTH DAY YEAR OF LAST CLOCK CORRECTION
       STTTTT - SIGN (P OR M) AND CLOCK ERROR AFTER CORRECTION
                IN SECONDS TO 3 DECIMAL PLACES
       MMDDYY - MONTH DAY YEAR WHEN CURRENT CLOCK ERROR WAS
                MEASURED
       STTTTT - SIGN (P OR M) AND CURRENT CLOCK ERROR IN SECONDS
                TO 3 DECIMAL PLACES
       MMDDYY - MONTH DAY YEAR OF MEASURED ERROR RATE
       STTTTT - SIGN (P OR M) AND CLOCK ERROR RATE EXPRESSED AS
                MILLISECONDS/DAY
       MMDDYY - MONTH DAY YEAR OF NEXT CLOCK CORRECTION

     IF THE NEXT CLOCK CORRECTION DATE (FIELD 6) IS UNKNOWN IT WILL
  BE SET TO ALL ZEROES.  IF ANY ERRORS ARE UNKNOWN (FIELDS 2 4 OR 6)
  THE FIELD WILL BE SET TO P99999.

     THE PLAIN LANGUAGE EXAMPLE IN PARAGRAPH 2 ABOVE WOULD BE CODED
  IN THE NEW FORMAT AS FOLLOWS:
  123195 M00100 041596 P00200 040196 P00002 082096

     FROM  THROUGH FEBRUARY 1997 BOTH THE PLAIN LANGUAGE
  AND CODED TIP CLOCK CORRECTION INFORMATION WILL BE CONTAINED IN PART IV
  SO USERS MAY BECOME FAMILIAR WITH THE NEW CODE.  EFFECTIVE WITH THE
  TBUS MESSAGES ISSUED MARCH 1 1997 THE PLAIN LANGUAGE CLOCK
  CORRECTION INFORMATION WILL BE DISCONTINUED AND ONLY THE CODED CLOCK
  INFORMATION TRANSMITTED.

     (2) EFFECTIVE IN NOVEMBER 1996 THE SPARESPARE FIELD AT THE END OF
  THE CODED PORTION OF PART IV WAS REPLACED WITH THE EQUATOR CROSSING
  LONGITUDE OF THE EPOCH REFERENCE ORBIT NUMBER CONTAINED IN FIELD 2 OF
  PART IV.  THE CROSSING LONGITUDE IS MEASURED AS EAST LONGITUDE TO 5
  DECIMAL PLACES (LLLLLLLL).

     USERS WITH QUESTIONS OR CONCERNS ABOUT THESE CHANGES ARE ADVISED
  TO CONTACT E. HARROD / NOAA NESDIS ESP12 / IPD - INGEST SYSTEMS BRANCH
  VIA EMAIL (EHARROD@NESDIS.NOAA.GOV) OR FAX (1-301-457-5199).  USERS ARE
  ALSO DIRECTED TO THE NOAA SATELLITE INFORMATION WEB SITE AT URL
  HTTP://psbsgi1.nesdis.noaa.gov/noaasis.html
  AND THE SATELLITE NAVIGATION WEB SITE AT URL
  HTTP://psbsgi1.nesdis.noaa.gov:8080/ISB/navigation/navpage.html
  FOR INFORMATION SPECIFIC TO THIS CHANGE AND GENERAL NAVIGATION
  INFORMATION.