Fast Determination 1 Signal Intelligence and Communications Countermeasures System; AN/ALQ-162 radar jamming equipment; AN/ALQ-144 infrared jammer; M-130 jammer dispenser; and others.
The AN/APR-39(V)1 radar warning receiver determines the frequency, pulse repetition frequency, pulse width, duration, and threshold power values for airborne missile and gun-sighting radars. Its continuous coverage extends from E to I bands with additional coverage in C, D and J bands.
The system utilizes two dual video receivers, one pair of knife antennas (located under the fuselage), four pairs of helical cavity reflector antennas, one indicator, one comparator, and one control unit. The cockpit display shows the orientation, characteristics and mode of operation of the detected signals.
The new AN/APR-39(V)2 replaces the comparator of the (V)1 with a CM-480/APR-39(V) digital processor, which performs the functions of signal classification, radiator identification, bearing calculation and character generation, and displays threat details in alphabetic and numeric form on the cockpit display. The unit is retrofitted with a repetition interval filter and coding amplifier.
The AN/ALQ-144 is an infrared countermeasure device that protects the helicopter from infrared-guided missiles. It is an omnidirectional system consisting of a cylindrical heat source surrounded by a highly efficient modulation system used to confuse the guide head of an incoming missile. It is available in several variants, the phase-locked version allows multi-system operation and can be mounted on the top or bottom of the helicopter in either single or dual phase-locked form. The unit weighs 14 kilograms and is powered by a 28-volt DC power supply with 1.2 to 2 kilowatts of power. It has a 360° coverage area and a mean time between failures of 480 hours.