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B
dissipated within avionics units remains much the same because of the high density packaging
techniques utilized. Consequently, the importance of providing avionics stack cooling is essential
to the life span of the equipment.
While each individual unit may not require forced air cooling, the combined heat load of several
units operating in a typical avionics stack will significantly degrade the reliability of the avionics if
provisions for stack cooling are not incorporated in the initial installation. Recommendations on
stack cooling are contained in Honeywell Installation Bulletin #55. Failure to provide stack cooling
will certainly lead to increased avionics maintenance costs and may void the warranty.
2.3.3
KT 76C INTERCONNECT WIRING AND CABLE HARNESS FABRICATION
A.
General
The KT 76C ATCRBS Transponder receives primary power from the aircraft
power source. Power connections, voltage requirements, circuit breaker re-
quirements are shown on the interconnect diagram (see
The length of the wires to parallel pins should be approximately the same
length, so that the best distribution of current can be effected. Honeywell rec-
ommends that all wires, including spares as shown on the interconnect dia-
gram be included in the fabrication of the wiring harness. However, if full wir-
ing is not desired, the installer should ensure that the minimum wiring require-
ments for the features and functions to be used be incorporated.
When cables are installed in the aircraft, they must be supported firmly
enough to prevent movement and should be carefully protected against chaff-
ing. Additional protection should also be provided in all location where the ca-
ble may be subjected to abuse.
In wire bundles, the cabling should not be tied tightly together as this tends to
increase the possibility of noise pickup and similar interference. When routing
cables through the aircraft the cables should cross high level rf lines at right
angles.
The following guidelines are recommended:
(1)
The installing facility will supply and fabricate all external cables. (See
Figures 2-5
as part of the installation kit (P/N 050-01577-0001).
(2)
The KT 76C and the associated wiring harness must be kept a minimum
of three feet from the transponder antenna coax and the termination con-
nector of the antenna to prevent rf interference from the antenna.
(3)
Do not route the transponder antenna coax near ADF sense or loop an-
tenna cables.
Rev 3, May 2004
ATCRBS TRANSPONDER
through
Figure
The total losses in the coaxial cable run and inter-
connects between the omni antenna and the KT 76C
transponder must be less than or equal to (
Use
Figure 2-2
as a reference and adhere to the di-
mensions prescribed in
IM 006-10545-0003.dwd
2-9). The required connectors are supplied
NOTE
Figure
2-5.
Figure
2-2).
≤
)2 dB.
Page 2-2
KT 76C
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