INMARSAT ANTENNAS

Since the inception of the company, Seavey Engineering has specialized in the design, certification and manufacturing of antennas for the INMARSAT user community. Seavey Engineering has the world’s broadest line of INMARSAT antennas. More than 25,000 INMARSAT antennas have been manufactured and delivered since 1987. Standard "A" and "B" Ship Earth Station (SES) antennas are offered; these mount to stable platforms aboard oceangoing vessels. Low-cost, fixed-site and transportable antennas are also offered.

For INMARSAT Standard C, M and Mini-M terminals, omnidirectional and moderate-gain antennas of several types are also available.

In general, all INMARSAT antennas can be used to downlink GOES satellite data.

All INMARSAT antennas operate with right-hand circular polarization. The uplink frequency band is 1626.5 - 1660.5 MHz and the downlink frequency band is 1525.0 - 1559.0 MHz. Strict specifications for gain, axial ratio and sidelobe envelope rolloff are required by the INMARSAT organization. All Seavey Engineering antennas are tested and certified for compliance with these requirements.

See Page 103 for INMARSAT feeds. Also, refer to Pages 10-13 for other mobile satellite antennas.

Model AS33-15C Std. A 20 dBic INMARSAT Antenna	Model AS35-15C/U INMARSAT Umbrella Antenna	Model AS48-15C Std. A 4-Foot INMARSAT Antenna

Model AS48S-15C/1 Std. A 2-Panel Aluminum INMARSAT Antenna	Model AS60-15C 5-Foot INMARSAT Antenna

Model AS72-15C/1 6-Foot INMARSAT Antenna	Model AS90-15C/2 INMARSAT 7.5-Foot Mesh Antenna	Model AS96-15C 8-Foot 4-Panel INMARSAT Antenna

INMARSAT Standard "M" and "Mini-M" Array Antennas

Model Number	Size inches	Peak Gain dBic	Features
9227-810	18 diameter, 1/2 thich	16.0	Maritime and fixed use
9237-800	11 x 17, 1/2 thick	16.0	Briefcase lid array
9149-800	16.5 square, 1/2 thick	17.0	2-panel folding array
9563-800	12 diameter	12.5	Maritime, Mini-M
9722-800	5 x 9, 1 thick	9.5	Maritime, Mini-M
9823-800	25 x 24, 7/8 thick	17.3	Folding briefcase, Mini-M

Model 9227-810 Maritime Std. M Antenna (less cover)

SPECIFICATIONS - Standard "M" Antennas

Frequency Range
Receive	1525.0 - 1559.0 MHz
Transmit	1625.5 - 1660.5 MHz
Polarization	Right-Hand Circular
System G/T	-12 dB/K (land-mobile)
	-10 dB/K (maritime)
Axial Ratio	2 dB maximum
Uplink Power	60 Watts, typical
Sidelobe Envelope	43 - 25 LOG, dBic between 40 and 83 degrees -5 dBic greater than 83 degrees (for axi-symmetric antennas)

Model 9237-800 Std. M Briefcase Lid Array	Model 9563-800 Maritime "Mini M" Antenna

Model 9823-800 Folding Briefcase "Mini M" Array

SPECIFICATIONS - Standard "Mini-M" Antennas

Frequency Range
Receive	1525.0 - 1559.0 MHz
Transmit	1626.5 - 1660.5 MHz
Polarization	Right-Hand Circular
System G/T	-17 dB/K to -7 dB/K
Axial Ratio	6 dB, maximum
Uplink Power	20 Watts, maximum
Sidelobe Envelope	38-25 LOG dBic between 40 and 90 degrees -12 dBic greater than 90 degrees (for maritime and land-mobile classes

INMARSAT Standard "C" Omnidirectional Antennas

Model Number	Size Inches	Peak Gain dBic	Features
9368-800	5 high, 2.00 diameter	2.0	Hemisperical
IOA-15	10 high, 1/6 tapering diameter	6.0	20 - 64 degrees coverage
9438-800	10 high, 2.75 diameter	6.0	26 - 65 degrees coverage

Model 9386-800 Hemispherical Omni	Model 9438-800 10-inch High Omni	Model IAO-15 Omni, Low Elevation Coverage

Miscellaneous INMARSAT Antennas

Model Number	Peak Gain dBic Nominal	Features
8357-800	20.0	4-helix array, Disassembles for transportation and storage, Mounts to any camera tripod.
8613-801	10.2	Fixed site helical antenna, 6 Inches long
8613-800	11.5	Fixed site helical antenna, 10 Inches long
8613-850	13.4	Fixed site helical antenna, 16 Inches long
8613-870	14.8	Fixed site helical antenna, 24 Inches long