Table of Contents
B
To prevent rf interference, the antenna must be physically mounted a mini-
mum distance of three feet from the KT 76C and the wiring harness.
The transponder antenna should be mounted a minimum of six feet away
from the DME antenna, four feet from the ADF sense antenna, and three feet
from TCAS antennas.
Where practical, plan the antenna location to keep cable lengths as short as
possible and avoid sharp bends in the cable to minimize the VSWR.
Avoid running other cables or wires near the antenna cable.
On pressurized aircraft, the antenna should be sealed using RTV No. 3145
(P/N016-01082-0000) or equivalent around the connector and mounting
hardware.
All antenna mounts should be sealed around from the outside for moisture
protection using RTV or equivalent.
Mount the antenna in as clean as environment as possible, away from ex-
haust gases and oils. The antenna should be kept clean. If left dirty (oil cov-
ered), the range of the transponder may be affected.
2.3.5
KT 76C INSTALLATION
The mounting tray for the transponder should be mounted using the dimensions specified in the
outline and mounting drawing,
system interconnect diagram,
A.
Transponder Tray
(1)
Rear connector wiring must be completed before permanently fastening
the mounting tray to the panel.
(2)
Remove the area specified on the outline and mounting drawing (see
Figure
damage to the adjacent equipment and cables.
(3)
Secure the tray to the panel. The mounting tray must be secured in the
rear by attaching the tray to a structural member of the airframe.
(4)
Look at the bottom of the unit and confirm the front lobe of the hold-down
device is in a vertical position. This can be accomplished by using a 3-32
inch Allen wrench through the front plate.
B.
Transponder
(1)
Slide the transponder into the tray until the front lobe touches the mount-
ing tray.
(2)
Turn the Allen wrench clockwise until the rear lobe engages the mount-
ing tray slot. Continue turning the wrench clockwise until tight.
Rev 3, May 2004
ATCRBS TRANSPONDER
Figure
2-3. The mounting tray should be wired according to the
Figure
2-2.
2-3) for front and rear dimensions. Care must be taken to avoid
CAUTION
DO NOT OVERTIGHTEN THE LOCKING FAS-
TENER
IM 006-10545-0003.dwd
KT 76C
Page 2-4
Hide quick links:
Table of Contents
