Primary Power And Circuit Breaker Requirements And Wiring; Functional Pinout Descriptions - Honeywell BENDIX KING KT 73 Installation Manual

Preliminary - Subject To Change Without Notice
BENDIX/KING
(2) The KT 73 must be kept a minimum of three feet from the antenna. Additionally, the
antenna coax cable should not be bundled with the other wiring harnesses to the KT
73.
(3) The length and routing of the external cables must be carefully planned before at-
tempting the actual installation. Avoid sharp bends or locating the cable near aircraft
control cables. The cables should be of a length to allow for a "maintenance loop".
That is, the length should be adequate to access and extend the connectors aft of
the panel for future maintenance purposes. Excess cabling should be secured and
stowed by tie-wrapping until such maintenance is required.
(4) The cables should be supported firmly enough to prevent movement. They should
be carefully protected wherever one may chafe against another or against some oth-
er object. Extra protection should be provided in all locations where the cables may
be subject to abuse. Shields on shielded wires should be grounded as shown on
the system interconnection diagrams.
(5) Shields should be carried through any obstruction via a thru-bulkhead connector. If
shielding cannot be carried through by use of a bulkhead/connector pin, precautions
should be taken to ensure each segment of the shielded lead be grounded at only
one point. A ground connection of not more than two inches in length should be
used. The preceding discussion does not apply to coaxial and quadraxial cable.
(6) Avoid routing cabling near high noise and high power sources.
(7) Do not route the transponder antenna coax near ADF sense or loop antenna cables.
2.3.3.2

Primary Power and Circuit Breaker Requirements and Wiring

The KT 73 transponder receives primary power from the aircraft power circuit breakers. The KT
73 is designed to operate over the range of 11-33V dc. Power connections, wire sizes, and circuit
breaker requirements are shown on the interconnection diagrams Figures 2-5 through 2-10.
2.3.3.3

Functional Pinout Descriptions

This section gives a brief description of the inputs and outputs of the KT 73 (refer also to figure -
2-3). It is provided so that the installer can determine what aircraft specific wiring requirements
are needed in order to install the unit. Unless otherwise specified, pins not used are to be left
open.
Rev 0, October/2002
NOTE:
The total losses in the coaxial cable run and inter-
connects between the antenna and the KT 73 tran-
sponder must not be less than 1 dB and must not be
more than 2.1 dB at 1030MHz. Use Figures 2-5
through 2-10 as a reference and adhere to the di-
mensions prescribed in Figure 2-13.
10563I00.JA
KT 73
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