AirCell ST 3100, Installation Manual

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3.3. Cable Routing
Draw a cable routing diagram for the aircraft. Refer to Wiring Diagrams, Section 10.0, to determine the
required cables, then measure and record the required cable lengths on a worksheet. Consider the use
of straight or 90 degree connectors to satisfy the bend radius requirements of the coax and allow for
access to the top of the AirCell
®
ST 3100 Transceiver to make required audio adjustments. Allow for
adequate bend radius, service loops, and stress relief in all cable routes. Follow the cable specifications
of Tables 3.1. Clear and concise specifications when ordering parts will ensure an efficient installation.
The Vendors provide cable loss decibel (dB) and VSWR data for the aircraft records.
3.4. Antenna Selection
Refer to
AirCell
®
Antenna Installation Manual P/N 800-10355
for options and installation details.
3.5. Handset Selection
Refer to
AirCell
®
Handset Installation Guide P/N 800-10055
for options and installation details.
3.6. ST 3100 Transceiver Location
Typically, the AirCell
®
ST 3100 Transceiver would be located in the avionics equipment bay. However,
when choosing the location of the AirCell
®
ST 3100 Transceiver, the requirement to keep the cable loss
below 3.0 dB from the AirCell
®
ST 3100 Transceiver to the Satellite Antenna and loss less than 3.0 dB
from satellite antenna to Transceiver are major considerations. This requirement is to ensure the best
overall system performance. Refer to Table 3.1 to properly select the coax cables required to meet these
requirements.
Note
Some of the RG-style cables used in General Aviation applications are
NOT ACCEPTABLE
when
installing the AirCell
®
ST 3100 system.
3.7. Power, Handset, and Audio Cabling
When considering the location of the AirCell
®
ST 3100 Transceiver, longer Handset cabling rather than
longer antenna cable runs will enhance the performance of the system. Use shielded twisted pairs of
wire, as shown in Wiring Diagrams, Section 10.0, to reduce interference. Size the power leads to
maintain the proper supply voltage within the limits identified in System Specifications, Section 7.0, and
satisfy the
requirements of FAA AC 43.13-1B. The telephone system will detect low battery voltage and
shut the system off.
3.8. Ring Detect
The Ring Detect (refer to Wiring Diagrams, Section 10.0) offers an annunciator function to be made
available in the aircraft. The operating conditions are as follows:
1) Pin G will go low (ground) when the telephone rings for an incoming call. Use this logic for a
visual annunciator or a Sonalert. Pin G will be low (ground) for one (1) second and off (open) for
three (3) seconds. This cycle will continue until the telephone is answered or the call attempt is
terminated.
2) Pin G will go low (ground) when there is an “Intercom Alert” signal received by the Transceiver.
Pin G will remain low (ground) for the duration of the intercom alert switch being energized.
Installation Procedures
Page 3-2
Section 3
800-10680-C, May 2007