Blue Sky Network 100140, Руководство по установке

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August 2007
Blue Sky Network
100177
D1000(A) IRIDIUM SATCOM DATA SOLUTION
Page 21
Dual-Channel Antenna (S67-1575-165) Installation
The S67-1575-165 Dual-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. No doubler plate is included with the dual
channel antenna, since each aircraft has a different shape and design.
The Dual-Channel Antenna has a J1 and a J2 channel. The D-1000 unit and
matching coax cable must be connected to the
J2 channel. This is the only channel
that will cover both the Iridium and GPS frequencies. If the antenna label states that
both channels work within the same frequency range, then any channel can be used.
Antenna Cable Installation
The antenna cable must be routed from the antenna to the D1000(A) Modem Unit.
The Modem Unit is generally installed in the avionics bay of the aircraft or other
location as determined by the installer.
Strict maximum attenuation requirements for the coax cable and connectors
that link the Antenna to the D1000(A) must be observed.
The signal loss budget,
including the antenna cable and all connectors, from the antenna to the D1000(A)
Modem Unit is < 1.5dB @1626MHz. Maximum cable length is determined by this
specification. Measured Voltage Standing Wave Ratio, or VSWR, of the coax cable
assembly, antenna and any bulkhead feed-through adapter must be less than 1.5 to
1.
Note: The Blue Sky Network Installation Kits include a 15-foot (4.6 m) FAA
approved low loss coax antenna cable sized to meet this requirement. In
addition, Blue Sky Network has custom cables lengths and configurations up
to 60 feet (18 meters) long to meet your installation requirements. You can
also request that one or both end connectors be shipped uninstalled to ease
cable routing.
Antenna Cable Routing Considerations
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The length and routing of cables must be carefully planned before starting the
installation.
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Avoid sharp bends in the cable. Exceeding the minimum bend radius of the
antenna coax cable may result in permanent degradation of the cable loss.
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Do not locate the cable near aircraft controls.
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Observe all appropriate sections of FAR Parts 23, 25, 27, and 29, as well as AC
43.13-1B and AC 43.13-2A
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In order to ensure optimum performance, the D1000(A) and associated wiring
should be kept a minimum of three feet from high noise sources and not routed
with cables from high power sources.