2023 NWWS Satellite Change

The SBN/NOAAPORT Satellite will change from Galaxy-28 at 89DegW (generally over Western Tennessee) to Galaxy-31 at 121DegW (generally over California) by April 30, 2023.

Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Effective in early 2023

This notice was updated to include a change to the Receive Site Transition Window Start date and the RF Frequency.

The NWS was notified by its current satellite vendor of their intention to realign the NOAAPort/SBN/NWWS service from the Intelsat Galaxy 28 satellite to the Galaxy 31 satellite.

The NWS has coordinated with its current satellite service vendors to mitigate impacts for all NOAAPort/SBN/NWWS customers. This includes activating a dedicated dual illumination period with the Galaxy 28 and the Galaxy 31 satellites to aid customers in transitioning to the newly designated NOAAPort/SBN satellite.

The NWS will continue to provide transition updates as additional information becomes available. The transition schedule follows below:

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Transition Schedule

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12 NOV 2022: G31 Launch Date

5 FEB 2023: Dual Illumination Period

17 FEB 2023: Receive Site Transition Window Start

31 MAR 2023:

Receive Site Transition Window Ends

3 APR 2023: AWIPS Transition to G31 Complete

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AWIPS C Band Service

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-- Satellite: G-31

-- Orbital Location: 121° West

-- Transponder: CH16/CV16 36MHz C band

-- Uplink Polarization (from Holmdel teleport to G31): Horizontal

-- Downlink Polarization (from G31 to remote AWIPS receive only sites): Vertical

-- Transponder Uplink Center frequency: 6245MHz

-- Transponder Downlink Center Frequency: 4020MHz

Satellite (G31) specifications/AWIPS

-- Receiver: Novra S300N DVB-S2 Receiver Configuration for DVB-S2 Full Transponder Operation

-- IP Address: User Defined

-- Subnet Mask: User Defined

-- Default Gateway: User Defined

-- Symbol Rate: 30 Msps

-- RF Frequency: 1130 MHz

-- LO Frequency: 0 MHz

-- PID(s): 101, 102, 103, 104, 105,106, 107,108, 150, 151

-- LNB Power: OFF

-- Polarity: Vertical/Right

-- Band: High

-- Enable IGMP Filtering: OFF

-- Unicast Status Packet: 255.255.255.255

-- Default password: User Defined

-- FEC Type: DVB-S2

-- Modulation/Coding: 16PSK 2/3

-- ISI: 18

Satellite (G31) specifications/NWWS

--(NWWS) Receiver: Novra S300N DVB-S2 Receiver

Configuration for DVB-S2 Full Transponder Operation

-- IP Address: User Defined

-- Subnet Mask: User Defined

-- Default Gateway: User Defined

-- Symbol Rate: 30 Msps

-- RF Frequency: 990 MHz

-- LO Frequency: 0 MHz

-- PID(s): 201

-- LNB Power: OFF

-- Polarity: Vertical/Right

-- Band: High

-- Enable IGMP Filtering: OFF

-- Unicast Status Packet: 255.255.255.255

-- Default password: User Defined

-- FEC Type: DVB-S2

-- Modulation/Coding: QPSK 1/3

-- ISI: 2

We would encourage all NOAAPort/SBN/NWWS users to closely monitor this SCN during the transition period for updated information. If you have any questions or concerns, please contact the focal points below:

James Glenn

NOAA/NWS Office of Central Processing Silver Spring, MD

Email: james.glenn@noaa.gov

Sanford Garrard

NOAA/NWS Office of Central Processing Silver Spring, MD

Email: sanford.garrard@noaa.gov

National Service Change Notices are online at: https://www.weather.gov/notification/archive

Effective 2022/06/30

Topic: Notification of Upcoming Orbit Location Maneuvers of GOES-17 and GOES-18
Date/Time Issued: June 30, 2022 1931 UTC
Product(s) or Data Impacted: None
Date/Time of Initial Impact: July 5, 2022 at 15:57 UTC for GOES 17 and July 5, 2022 at 16:54 UTC for GOES-18
Date/Time of Expected End: July 16, 2022 at TBD time for GOES-17 and July 20, 2022 at TBD time for GOES-18 Length of Event/Outage: N/A

Details/Specifics of Change:

NOAA will be repositioning GOES-17 and GOES-18 with synchronized burns to maintain a longitude separation of 0.3 degrees for RFI avoidance during drift and while on-station. These are both slow rate location “nudges”, as opposed to nominal drifts which are faster and cause a disruption to data availability.  Start burns will be executed July 5th and both will utilize natural drift to stop at their new stations.

GOES-17 nudge start at 137.2W on July 5th at 15:57 UTC
GOES-17 nudge stop at 137.3W on July 16th at TBD time
GOES-18 nudge start at 136.8W on July 5th at 16:54 UTC
GOES-18 nudge stop at 137.0W on July 20th at TBD time

There are no anticipated L-band downlink impacts for GOES-17 GRB, HRIT/EMWIN and DCS users regarding the 0.1 degree westward longitudinal drift.  Antennas smaller than 7m should not need to repoint.  Antennas larger than 7m should repoint.Users are reminded to peak their antennas after the nudge periods end in order to achieve the best optimal signal.

Contact Information for Further Information: Joseph Fiore at joseph.fiore@noaa.gov

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