May 2007
Blue
Sky
Network
100236
D1000C IRIDIUM SATCOM DATA SOLUTION
Page
17
A
NTENNA
& A
NTENNA
C
ABLE
I
NSTALLATION
For optimum performance, the antenna must be installed on the upper surface of the
aircraft fuselage, away from the vertical stabilizer and with an unrestricted view of the
sky down to eight degrees above the horizon (similar to a GPS antenna).
Transmission from the antenna may be affected by, and can affect the operation of
other systems and it is the installer’s responsibility to evaluate the location for any
possible RF interference. In particular, the Iridium frequency is near the allocated
GPS and Inmarsat band.
The antenna should be at least 39 inches (1 meter) from
any L-band antennas, particularly GPS, TCAS and Transponder antennas.
Observe all appropriate sections of AC 43.13-1B and AC 43.13-2A.
Strict maximum attenuation requirements for the coax cable and connectors
that link the Antenna to the D-1000 Unit must be observed.
The signal loss
budget, including the antenna cable and all connector, from the antenna to the D-
1000 Unit is < 1.5dB @1626MHz. The BSN Installation Kits include the FAA
approved low loss coax antenna cable sized to meet this requirement.
Single-Channel Antenna (S67-1575-109) Installation
The S67-1575-109 Single-Channel Antenna has a low profile, providing structurally
insignificant drag loads. The antenna is usually installed using four MS27039C1-10
attachment screws (10-32). However, each aircraft has unique airframe issues.
The
installer is responsible for the decision on any antenna installation issue
A 1.25-inch (32 mm) diameter penetration, drilled at installation, permits the antenna
coax connector to be fed into the aircraft. A doubler, provided with the antenna,
reinforces the 1.25-inch diameter penetration. The doubler is 0.040 inch (1.0 mm)
thick 6061-T6 aluminum alloy and creates an effective ring of 4.09 inches (104 mm).
The doubler is attached to the skin using sixteen NAS1097AD3 rivets.
This doubler
may NOT be appropriate for your aircraft. The installation material required may
vary from aircraft to aircraft and is the responsibility of the installer to determine.
Doubler Plate
UNCONTROLLED COPY IF PRINTED
