NOAA-15 APT Off During NOAA-12/NOAA-15 Conflict Period 28 May - 19 July 2004 ==================================================================== Satellite(s) Involved: NOAA-12, NOAA-15 Instrument(s) Involved: APT. Product(s) Involved/Affected: Direct readout user data access Date/Time(UTC) of Initial Implementation: 7 June 2004, 1200 UTC Details/Specifics of Change: SOCC has issued the following notice: NOAA-12 and NOAA-15 will enter a conflict period on May 28 that will last for approximately 52 days. The BEACON frequencies are separated enough that both can be left on during this conflict. Due to real-time users' requests, the NOAA-15 APT will be off for the VHF conflict duration. Events during conflict period: - The interrogation conflict period will begin around 0200 UTC on May 28 (S/C separated by 25 minutes). - NOAA-15 APT will be turned off at approximately 1200 UTC on June 7 (S/C separated by 15 minutes) when VHF conflict begins. - SBAND conflict will be experienced from about June 22, 0300 UTC, through June 24, 0200 UTC, when S/C separation will be around 1 minute. - APT will be turned back on on July 8 around 1700 UTC (S/C separated by 15 minutes) when VHF conflict ends. - The interrogation conflict period will end July 19 around 0600 UTC. Contact Person(s) Name/Email/Phone Number for Questions: James Devine James.Devine@noaa.gov 301-817-4020 (SOCC Operations) Charlie Vance Charlie.Vance@noaa.gov 301-457-5247 ext 139 (IPD Operations) Web site(s) that contain other relevant information (where applicable): http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B notices http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices http://www.oso.noaa.gov/poesstatus/ - SOCC polar satellites status http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports The current RF conflict with NOAA-12 will end on December 7 at 0100 UTC at which time the NOAA-12 VTX-1 (for APT data) will be commanded ON. During this period, APT will be transmitted from NOAA-15 on 137.50 MHz as usual. ------------------------------------------------------------------------------------------------------ Posted to NOAASIS at 1600 UTC on 27 May 2004