Operation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
In an auto select configuration, the first system (System 1
or System 2) to be keyed is selected to transmit, and
transmission from the other system is inhibited until the
first system has stopped transmitting.
The RM-855 Radio Management Unit, the MDCU Multifunction
Control Display Unit, or the PS440 Stand-Alone HF Controller
determines the frequency and mode of operation of the system
and displays that information to the pilot.
Receiver and low level transmitter signals are located in the
KRX 1053 Receiver/Exciter. The KRX 1053 Receiver/Exciter
employs an oven controlled oscillator, which requires a short
warm-up period to generate the frequency reference required
for the synthesizer.
The KAC 1052 Power Amplifier amplifies the excitation signal
from the KRX 1053 Receiver/Exciter to 200 watts PEP, or 50
watts of carrier power in AM. The amplified signal is routed
to the KAC 1052 Antenna Coupler, which matches the various
impedances of the antenna to the 50 ohm output of the
transmitter. In receive function, signals from the antenna
pass through the KAC 1052 Antenna Coupler to the KRX 1053
Receiver/Exciter.
The KHF 1050 can be installed as a single or dual HF system.
In a dual system when one system is transmitting, receive on
the other system is disbled. The single antenna in a dual
system can be tuned to only one frequency at any given time.
If the two systems are tuned to different frequencies, the
strongest reception is realized on the primary system, which
is tuned to the same frequency as the antenna. The primary
system is defined as the system that was last used for
transmission in auto-select configuration. The secondary
system would employ an internal bridging amplifier to improve
reception. No external accessories ae required for dual system
operation for the KHF 1050.
When two independent HF systems employing two separate
antennas are used on one aircraft, it is important to maximize
separation between the antennas. A minimum of 6 ft. (2 m.)
separation is recommended and the antennas should be
configured as orthogonally as possible.
Revision 0
10640I00.SLK
N
KHF 1050 SYSTEM INSTALLATION MANUAL
23-10-09
Page 4
Mar/2003