Incoming generated [Aug 8 2017]

0621-EX-CN-2017 Correspondence

Thales Avionics, Inc.

2017-08-08ELS_196426

From: David Katko

To: Leann Nguyen
Date: August 08, 2017

Subject: Request for Info - File # 0621-EX-CN-2017
----------------------------------------------------------------------------------------------------------------
Message:

Leann - below please find the information you requested on August 4. Please let me know if you need
anything else.

Sincerely,
David Katko

A – Ground Station Antenna

1) Polarization - Right Hand Circular (RHC) in both uplink and downlink

2) Azimuth (degrees clockwise from true north) - Satellites are in polar orbits with orbital period of
100.5 minutes and are therefore constantly rising in the North/South and setting on the opposite pole.
Azimuth from the test locations will sweep from 0 to 180 degrees, or 360 to 180 degrees, or vice versa
depending on ground track.

3) Location Elevation (above MSL in meters):
Melbourne, FL (Babcock St.) = 6.7 m
Melbourne, FL (Hibiscus Blvd.) = 8.0 m
Phoenix, AZ = 435 m
Little Rock, AR = 81 m
Seattle, WA = 4.5 m

4) Antenna height (above ground level, in meters)
Melbourne, FL (Babcock St.) = 22.6 m
Melbourne, FL (Hibiscus Blvd.) = 10.7 m
Phoenix, AZ = 9.8 m
Little Rock, AR = 8.5 m
Seattle, WA = 16.8 m

B – Space Station

1) Antenna gain
transmit = 23.6 dBi max at beam peak; 10.8 dBi min at beam edge
receive = 23.6 dBi max at beam peak; 10.8 dBi min at beam edge

2) Beamwidth – 11.3 degrees (full beamwidth), 3 dB down from peak

C – Orbital Characteristics
1) Inclination angle = 86.4 degrees
2) Apogee = 780 km nominal (circular)
3) Perigee = 780 km nominal (circular)
4) Period = 1.675 hours (100.5 minutes)
5) Number of satellites in system = 89
6) Number of transmitting satellites = 66
7) Number of receiving satellites = 66

D – Contact for system termination in case of interference:

John Bard – Thales Chief Systems Engineer, Iridium NEXT
mobile phone: 321-213-8757
email: john.bard@us.thalesgroup.com

Document Created: 2017-08-08 15:25:43
Document Modified: 2017-08-08 15:25:43

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