2.240.000-1 ARK-15

2.240.000-1 antenna matching unit in ARK-15 systems

2.240.000-1 is an antenna matching unit used in ARK-15 and ARK-15M airborne automatic radio compass systems. The unit matches the electrical parameters of the aircraft non-directional antenna with the receiver input circuits. Its function is to support stable signal transfer in the antenna-feeder path and reduce signal losses that can affect radio navigation performance. The matching unit works as part of the complete radio compass system and should be considered together with the receiver, loop antenna, control panel and aircraft antenna installation.

Impedance matching through 2.240.000-1

The 2.240.000-1 unit transforms the high impedance of the external non-directional antenna into a level suitable for the receiver input. It uses inductive and capacitive elements to perform impedance and phase matching of the received signal. Correct matching is important because poor antenna-receiver coupling can reduce sensitivity, distort signal phase relationships and affect bearing operation. In the ARK-15 / ARK-15M system, the matching unit helps maintain correct interaction between loop and non-directional antenna channels during direction finding and reception modes.

2.240.000-1 in compass, antenna and loop modes

The 2.240.000-1 operates in the radio compass signal path during system operation in Compass, Antenna and Loop modes. In these modes, the unit helps maintain signal quality between the aircraft antenna system and the receiver. Proper matching supports reliable reception of ground-based radio beacons and broadcast stations in the low- and medium-frequency bands used by the radio compass. Since bearing indication depends on stable antenna input and correct signal phase relationships, the condition of the matching unit can affect navigation reliability.

Installation of 2.240.000-1 near the antenna feeder

The antenna matching unit is installed close to the antenna feeder input point. This location reduces the influence of cable length and feeder characteristics on the received signal. Correct installation is important because the antenna-feeder system works at relatively low radio frequencies, where wiring layout, shielding and grounding can affect signal behavior. During inspection or troubleshooting, the matching unit should be checked together with antenna connections, feeder cables, grounding points, receiver input wiring and the physical condition of the aircraft antenna installation.

Aircraft application of 2.240.000-1

The 2.240.000-1 matching unit is used on aircraft and helicopters equipped with ARK-15 or ARK-15M automatic radio compass systems. Typical application includes Mi-8 and Mi-17 helicopters, Tu-154, Il-76, An-24 / An-26 and Yak-series aircraft, depending on installed avionics configuration and aircraft documentation. Since radio navigation equipment may differ by aircraft type, modification and modernization status, applicability should be confirmed by the aircraft equipment list, radio compass documentation and maintenance manual before supply or installation.

Identification and ordering of 2.240.000-1

Before ordering 2.240.000-1, the aircraft type, installed radio compass version, required condition and documentation set should be confirmed. The unit may be requested for repair, replacement or restoration of the ARK-15 / ARK-15M radio navigation system. It is useful to specify whether the request concerns the matching unit only or a wider radio compass set including the receiver 2.003.013-01, loop antenna 2.090.020 and control panel 3.624.049. For acceptance, passport availability, test records, connector condition and compatibility with the aircraft antenna installation should be clarified.

Product Type: Antenna matching unit / AMU
Designation: 2.240.000-1
Alternative Designations: Antenna matching unit 2.240.000-1, ARK-15 / ARK-15M AMU
Function: Impedance and phase matching between aircraft antenna and receiver
Application / Where Used: ARK-15 / ARK-15M airborne automatic radio compass system
System / Installation Area: Aircraft radio navigation system / antenna-feeder path
Compatible Aircraft / Equipment: Mi-8, Mi-17, Tu-154, Il-76, An-24 / An-26, Yak-series aircraft and other aircraft equipped with ARK-15 / ARK-15M
Associated Systems: ARK-15, ARK-15M automatic radio compass systems
Frequency Range: 150–1799.5 kHz
Antenna Type: Non-directional external antenna, wire or rod type
Power Supply: 27 V DC aircraft onboard network
Operating Modes: Compass / Antenna / Loop
Installation: Near antenna feeder input point
Working Principle: Inductive-capacitive impedance and phase matching network
System Components: Receiver 2.003.013-01; loop antenna 2.090.020; control panel 3.624.049
Operating Role: Signal matching and reduction of losses in antenna-feeder system
Condition: As applicable
Technical Documentation: ARK-15 / ARK-15M system documentation, aircraft maintenance documentation, product passport and test records if available

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