2.090.020 ARK-15M

2.090.020 loop antenna unit in the ARK-15M system

2.090.020 is a loop antenna unit used as part of the ARK-15M automatic radio compass system. The unit receives radio signals from ground-based beacons and broadcast stations and provides the primary antenna input required for onboard radio direction finding. It works in the aircraft radio navigation system together with the receiver, matching unit and control panel. The antenna unit is not a standalone navigation device; it is one of the key external components that allows the ARK-15M system to determine bearing direction and support radio navigation.

Signal reception through the 2.090.020 antenna

The 2.090.020 antenna receives low- and medium-frequency radio signals used by the automatic radio compass. These signals are then passed to the receiver unit for amplification, processing and bearing calculation. The quality of reception depends not only on the antenna itself, but also on its installation, cable condition, matching device, receiver performance and aircraft structure around the antenna location. Since the antenna is part of a direction-finding system, damage, poor shielding, incorrect mounting or moisture ingress can affect bearing indication and system stability.

2.090.020 non-rotating loop antenna design

The 2.090.020 antenna unit is based on a non-rotating loop antenna design. It contains two mutually perpendicular loops, which form the directional receiving element of the radio compass system. This layout eliminates mechanical rotation inside the antenna and reduces the number of moving parts in the direction-finding path. The loop antenna creates a figure-eight directional reception pattern, allowing the system to compare signal strength and determine the relative bearing to the radio source. This design supports reliable operation in aircraft navigation environments.

Installation of 2.090.020 on the aircraft fuselage

The 2.090.020 loop antenna unit is installed externally on the aircraft fuselage, typically in the lower fuselage area. It is mounted under a radio-transparent radome, which protects the antenna from airflow, precipitation, contamination and other environmental effects while allowing radio signals to pass through. Correct installation is important because the antenna pattern and bearing accuracy depend on placement, orientation and surrounding structure. During maintenance, technicians normally check the radome, antenna mounting, cable connections, sealing condition and signs of mechanical damage.

Aircraft application of 2.090.020

The 2.090.020 unit is used on aircraft and helicopters equipped with the ARK-15M automatic radio compass. Typical application includes Mi-8 and Mi-17 helicopters, as well as fixed-wing aircraft fitted with the same radio compass system. Since aircraft may differ by modification, avionics configuration, overhaul history and modernization status, applicability should be confirmed through the aircraft equipment list and ARK-15M system documentation. A similar antenna should not be treated as interchangeable unless the part number, mounting configuration and system compatibility are confirmed.

Identification and ordering of 2.090.020

Before ordering 2.090.020, the aircraft type, installed radio compass version, required condition and documentation set should be confirmed. The antenna works together with the receiver unit, matching unit and control panel, so the complete system configuration should be checked if the request is related to troubleshooting or system restoration. For supply, it is useful to specify the full designation, installation location, radome condition if applicable, cable or connector requirements, passport availability and whether associated ARK-15M components are also required.

Product Type: Loop antenna unit / direction-finding antenna
Designation: 2.090.020
Alternative Designations: Loop antenna unit 2.090.020, ARK-15M loop antenna
Function: Reception of radio signals and support of bearing direction determination
Application / Where Used: ARK-15M airborne automatic radio compass system
System / Installation Area: Aircraft radio navigation system / external fuselage antenna installation
Compatible Aircraft / Equipment: Mi-8, Mi-17 and other aircraft equipped with ARK-15M according to applicable documentation
Associated System: ARK-15M automatic radio compass
Antenna Type: Non-rotating loop antenna
Antenna Configuration: Dual-loop configuration with two mutually perpendicular loops
Radiation / Reception Pattern: Figure-eight directional pattern
Installation: External fuselage mounting under radio-transparent radome
System Components: Receiver unit 2.003.006-01; matching unit 2.240.000; control panel 3.624.049
Operating Role: Primary signal reception for radio direction finding and bearing indication
Condition: As applicable
Technical Documentation: ARK-15M system documentation, aircraft maintenance documentation, product passport and installation records if available

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