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international and offshore communications (most
commonly in Australia and the Far East), but is not
authorized in the United States and most European
countries.
The HF-190 series communications system can operate to 40,000 feet
altitude with continuous key, 40,000 to 55,000 feet altitude with one minute
key / one minute unkey, and 55,000 to 70,000 feet altitude with half minute
key / three and one-half minute unkey, at temperatures from -54°C to
+71°C.
The system contains an extensive self-test function to detect faults to the
lowest Line Replaceable Unit (LRU). It displays the faults on the FAULT
readout in code form and by illuminating appropriate fault light (CP / RT /
CT). During self-test, all segments of the display and CP / RT / CT fault
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
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Revision 7
lights will be illuminated. Any system fault detected will be displayed in the
FAULT readout and in most cases, the transmit mode will be inhibited.
B. Collins HF-9000 System:
The Collins HF-9000 series communications system is a dualized full
frequency system designed to provide the flight crew with very long range
airborne voice and data communication. It consists of two single systems
sharing a common HF antenna.
The HF-9000 system employs the use of fiber-optic cables to serially
transmit all control and status information between units. Transmit and
receive RF signals are supported by the RF coaxial cable. The system
operates on the frequency band of 2.0000 through 29.9999 MHz, which
allows 280,000 channels spaced in 100 Hz increments.
HF operating modes (either simplex or half duplex) are:
• MAN: Manual discrete frequency mode
• CHN: User-programmed preset channel mode
• SCN: User-programmed preset channel receive scan mode
• MAR: Maritime preprogrammed preset channel mode
• TST: Built-In Test (BIT) mode
• PGM: User-programmable preset channel program mode
• EMR: Emergency preprogrammed preset channel mode
• EXT: External system control mode
• SBY: Standby control mode
Emission modes include:
• UV: Upper Side Band - Voice
• LV: Lower Side Band - Voice
• UD: Upper Side Band - Data
• LD: Lower Side Band - Data
• CW: Continuous Wave
• AM: Amplitude Modulation
• FM: Frequency Modulation (Optional)
NOTE:
The use of lower side band is legal for some
international and offshore communications (most
commonly in Australia and the Far East), but is not
authorized in the United States and most European
countries.
Transmitter power output is selectable to three levels:
• Low - 10 Watts ±1db Peak Envelope Power (PEP) average
• Medium - 50 Watts ±1db PEP average
• High - 175 Watts ±1db PEP 50-watt average
The system has preset capabilities that include 99 user-programmable
frequencies, 176 pre-programmed International Telecommunications Union
(ITU) maritime frequencies and two preprogrammed emergency
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
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May 30/02
Revision 7
international distress frequencies. Receiving is continuous. For
transmitting, the system is capable of continuous voice operation at
temperatures -55°C to +71°C.
The HF-9000 system employs an extensive self-test function to determine
which unit has a fault and to display it on the control unit by illuminating the
following two-digit codes:
• RT - Receiver / Transmitter
• CU - Antenna Coupler
• R - Remote Control Unit
• FO - Fiber-optic Link
• _ _ (Two Blanks) - External System Malfunction
3. Description of Subsystems, Units and Components:
A. Components Common To Both Series:
(1) Receiver / Transmitters:
Two receiver / transmitters are installed in the tail compartment.
Each can operate independent of one another. Since there is only
one HF antenna, both systems can receive information
simultaneously. With one of the systems in transmit mode, however,
the other system is disconnected from the antenna and is unable to
receive or transmit.
(2) Antenna Couplers:
Two antenna couplers are installed in the tail compartment. They
are pressurized tuning assemblies with a sealed control
compartment. Pressurization is done to the tuner assembly to
prevent possible high voltage arcing at high altitudes, to provide a
predictable cooling medium and to prevent corrosive elements from
entering the unit. Output from the couplers is provided to a common
antenna adapter.
　
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