User's Manual

Page 2-4 GTS Processor Installation Manual

Revision A 190-00587-50

2.4 Cabling and Wiring

The contacts used to facilitate the use of #18 AWG wire, if used for Aircraft Power and Aircraft Ground,

have expanded-diameter barrels that extend out from the back of the standard D-sub connector body to

accommodate the larger diameter wire. Appropriate heat shrink tubing should be utilized to provide

sufficient insulation from surrounding contacts.

When removing an expanded-diameter barrel contact, always cut off the

expanded-diameter barrel before using an extraction tool to remove the contact.

Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.

Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and

routing near aircraft control cables.

All appliance to antenna coaxial cabling shall bundle top four channels as a group

and bottom four channels as a group to prevent incorrect wiring between top and

bottom channels.

A visual inspection shall be performed to verify that all coaxial cables are connected properly, before

attempting to operate the equipment.

2.4.1 Coaxial Cable

The GTS Processor requires two sets of coaxial cable assemblies when a directional GA 58 antenna (or

other Garmin approved antenna) is used for both top and bottom. Each set consists of four coaxial cable

assemblies.

Each set of four cables must be assembled using the same type of coaxial cable in order to meet phase and

attenuation matching requirements. In order for the system to operate in compliance with manufacturer

specifications, the coaxial cable assemblies must not exceed the attenuation specifications as stated in this

document. This section explains in further detail the coaxial cable and termination requirements.

TNC connectors and BNC connectors, required for building the coaxial cable

assemblies for some antenna options, are not provided.

2.4.1.1 GTS Processor Installations

For all GTS Processor installations, either a monopole antenna or directional

antenna (recommended) may be used if installing a bottom mounted antenna.

GTS 8000 installations require either a bottom-mounted directional

(recommended) or monopole antenna. A bottom antenna is optional for GTS 855/

GTS 825 installations, but a bottom directional antenna is recommended for best

performance. A bottom directional antenna installation gives the benefit of

intruder bearing visibility for targets that are shaded from the top directional

antenna. The target bearing accuracy may be degraded for bottom directional

antenna installations on aircraft with fixed gear.

A GTS Processor installation with both top and bottom mounted directional antennas uses one set of

coaxial cables for the four GTS Processor TOP jacks (J1 TOP, J2 TOP, J3 TOP, J4 TOP) that are connected

to the corresponding top antenna jacks J1, J2, J3 and J4. A second set of coaxial cables are used for the

four GTS Processor BTM jacks (J1 BTM, J2 BTM, J3 BTM, J4 BTM) that are connected to the

corresponding bottom antenna jacks J1, J2, J3 and J4. Each cable assembly shall not exceed the maximum

NOTE

DRAFT