Honeywell International Inc. SCS-1000 External Photos
SECURITY NOTATION
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5200-032 (REV 960102 BCAS ASF5900/ENG_SPEC.DOT) (REV 08/01/97-LOGISTICS/BCAS) HONEYWELL INC.
ENGINEERING
SPECIFICATION
TITLE: FCC CERTIFICATION REPORT FOR THE HONEYWELL MINI-M SATCOM SYSTEM
SCS-1000
1. INTRODUCTION
This report consists of technical and other related information to support FCC certification of the
Honeywell SCS-1000 system. This document has been prepared in accordance with 47 CFR 2.1033(c).
Honeywell SCS-1000 system. This document has been prepared in accordance with 47 CFR 2.1033(c).
1.1 System
Description
The SCS-1000 system described herein is an avionics communication system that provides single
channel voice, fax, and PC data communication services to and from the aircraft as defined in the
INMARSAT Mini-M Aero System Description Manual. The SCS-1000 system interfaces with the aircraft
28 VDC power bus and communicates with the INMARSAT satellite constellation via L-band RF signals
which emanate from the SCS-1000 antenna unit. These satellites convey the information to and from
ground stations that interface with the terrestrial public-switched telephone network (PSTN).
channel voice, fax, and PC data communication services to and from the aircraft as defined in the
INMARSAT Mini-M Aero System Description Manual. The SCS-1000 system interfaces with the aircraft
28 VDC power bus and communicates with the INMARSAT satellite constellation via L-band RF signals
which emanate from the SCS-1000 antenna unit. These satellites convey the information to and from
ground stations that interface with the terrestrial public-switched telephone network (PSTN).
The SCS-1000 system consists of 5 sub-components: the Aero Anetnna Unit (AAU), the Antenna
Control Unit (ACU), the Power Supply Unit (PSU), the Telephone Unit (TPU), and the Handset Unit
(HSU). The functions of encoding/decoding, modulation/demodulation, position determination, power
distribution, antenna position computations, communications protocol, and user interface are distributed
among the ACU, PSU, TPU, and HSU. See section 4.1 for the part numbers of the above listed units.
Control Unit (ACU), the Power Supply Unit (PSU), the Telephone Unit (TPU), and the Handset Unit
(HSU). The functions of encoding/decoding, modulation/demodulation, position determination, power
distribution, antenna position computations, communications protocol, and user interface are distributed
among the ACU, PSU, TPU, and HSU. See section 4.1 for the part numbers of the above listed units.
The AAU contains a 2 axis mechanically steered antenna for tracking a geo-stationary satellite from a
moving base. The gimbaled antenna transmits and receives signals in the 1.6 GHz band. In addition to
the mechanically steered antenna, the AAU also contains a GPS antenna, angular sensors and
electronics for processing the inputs from the ACU for antenna positioning. The AAU also contains a
micro-controller which is used to read the sensors, communicate this sensor data serially to the ACU,
process the serial inputs from the ACU, and translate the serial input data into motor commands to drive
the antenna to the correct orientation.
moving base. The gimbaled antenna transmits and receives signals in the 1.6 GHz band. In addition to
the mechanically steered antenna, the AAU also contains a GPS antenna, angular sensors and
electronics for processing the inputs from the ACU for antenna positioning. The AAU also contains a
micro-controller which is used to read the sensors, communicate this sensor data serially to the ACU,
process the serial inputs from the ACU, and translate the serial input data into motor commands to drive
the antenna to the correct orientation.
The ACU serves as an interface module between the AAU and the TPU. It is comprised of an RF
Board, an Antenna Tracking Board, a BPS Engine, and a Diplexer/LNA. The function of the RF Board is
to amplify the received and transmitted signals, mix down the received signal, set the transmitted power
and perform serial communications with the TPU.
Board, an Antenna Tracking Board, a BPS Engine, and a Diplexer/LNA. The function of the RF Board is
to amplify the received and transmitted signals, mix down the received signal, set the transmitted power
and perform serial communications with the TPU.
The Antenna Tracking Board performs serial communications with the TPU, the GPS Engine, and with
the AAU. Additionally, it performs 5 VDC voltage regulation, superimposes DC voltage onto the GPS
line, executes the tracking algorithm, and stores aircraft calibration data.
the AAU. Additionally, it performs 5 VDC voltage regulation, superimposes DC voltage onto the GPS
line, executes the tracking algorithm, and stores aircraft calibration data.
The GPS Engine takes in the GPS data from the Antenna Tracking board and computes aircraft position
and velocity. The Diplexer/LNA amplifies the Received L-band signal and combines the received and
transmitted signal.
and velocity. The Diplexer/LNA amplifies the Received L-band signal and combines the received and
transmitted signal.
The voltage source for the PSU is the 28 VDC supply from the aircraft. From this DC source the PSU
supplies regulated 16 VDC to the TPU and 27.5 VDC to the ACU.
supplies regulated 16 VDC to the TPU and 27.5 VDC to the ACU.
In addition to providing a regulated voltage source, the PSU acts as a conduit for the RF signal between
the TPU and the ACU. The PSU monitors the DC voltage from the TPU which is superimposed onto the
RF signal. This DC component is removed and replaced with 27.5 VDC which serves as the voltage
the TPU and the ACU. The PSU monitors the DC voltage from the TPU which is superimposed onto the
RF signal. This DC component is removed and replaced with 27.5 VDC which serves as the voltage