Honeywell Bendix/King KY 196B Installation Manual page 12

a typical panel or rack can significantly degrade the reliability of the equipment if provisions
for adequate cooling are not incorporated in the initial installation.
2.3.2 MOUNTING RACK INSTALLATION
A. The KY 196B is mounted rigidly in the aircraft panel. Select a position in the panel
that is not too close to any high external heat source. Remember to allow adequate
space for installation of cables and connectors. Avoid sharp bends and placing the
cables too near the aircraft control cables.
B. When installing two or more panel mounted units in a stack, the mounting trays shall be
spaced 0.050 inches (0.127 cm) apart. Current production mounting trays have 0.025
inch (0.064 cm) dimples built in to top and bottom and both sides so that the trays will
automatically be spaced properly.
C. Refer to Figure 2--8
mounting holes.
D. Secure the mounting rack to the instrument panel per
bosses should be attached to the airframe by means of support brackets.
2.3.3 ANTENNA INSTALLATION
A conventional 50Ω vertically polarized comm antenna is required with the KY 196B. Vertical bent
whip antennas are not recommended. Wideband comm antennas provide efficient operation over
the comm band. Antennas should be installed per manufacturer's recommendations. Additional
recommendations are as follows:
A. Mount antenna on a flat metal surface or install a ground plane at least 18 inches square.
B. The antenna should be well removed from any projections and the engine(s) and
propeller(s). Also, for satisfactory operation, the antenna isolation between a
communications transmitter antenna and a nav receiver antenna, as well as between
dual comm antennas, should be a minimum of 30dB. VHF antennas mounted on top
and bottom have approximately 30dB isolation. A horizontally polarized nav antenna
and a vertically polarized comm antenna will have practical values from 10 to 30dB.
C. If both comm antennas must be top mounted or both bottom mounted, antenna isolation
between comms may not be adequate to prevent reradiation. In single audio panel
installations, reradiation can be prevented by use of the XMIT--REC interlock. In dual
audio panel installations where simultaneous operation of both comms is desired, the
XMIT--REC interlock is not recommended.
2.3.4 CABLE HARNESS AND CONNECTOR ASSEMBLY
The KY 196B uses a special connector that mates directly with the printed circuit board
inside the unit. Assembly of the connector is as follows:
A. Contact Terminal Assembly using Molex Crimper (See
1. Strip each wire 5/32" for contact terminal, PN 030--01107--00XX. Note: The last two
digits of the part number indicates the number of terminals required.
2. Place the conductor tab section of a contact terminal on the appropriate anvil of the
hand crimping tool. Close the crimper until the terminal is held lightly in place.
Page 2-2
BENDIX/KING
KY 196B
VHF COMMUNICATIONS TRANSCEIVER
for the KY 196B mounting dimensions. Mark and cut the
Figure 2--8. The rear mounting
Figure 2--2)
10570I01.ZIPCDL
Rev 1 January/2000