User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Page 24 Trig Avionics Limited
 Route the cable away from sources of heat.
 Route the cable away from potential interference sources such as
ignition wiring, 400Hz generators, fluorescent lighting and electric
motors.
 Allow a minimum separation of 300mm (12 inches) from an ADF
antenna cable.
 Keep the cable run as short as possible.
 Avoid routing the cable round tight bends.
 Avoid kinking the cable even temporarily during installation.
 Secure the cable so that it cannot interfere with other systems.
5.11.3 TNC Connector
This section describes the technique for attaching the antenna cable to the
supplied TNC connector.
If a low-loss cable is needed that has too large a dielectric diameter to fit the
supplied connector, a short length (up to 150mm or 6 inches) of smaller cable
may be used with suitable mating connectors to adapt to the transponder
connector.
The supplied connector can be completed using a wide range of commercial
crimp tools (for example the Tyco 5-1814800-3). The die apertures for the
inner pin and the outer shield should be approximately 1.72 mm and 5.41 mm
respectively.
 Strip back the coax cable to the dimensions in the table, as shown in
the diagram below. Slide 25 mm (1 inch) of heat shrink tubing over
the cable.
 Slide the outer crimp sleeve over the cable – it must go on before
securing the centre contact.