8AT-7103-030 / 8AT.7103.030

8AT-7103-030 / 8AT.7103.030 HF wire antenna for Mi-8 helicopters

8AT-7103-030 / 8AT.7103.030 is an aircraft HF wire antenna used on Mi-8 family helicopters equipped with shortwave communication systems. The antenna provides transmission and reception of HF radio signals and supports long-range two-way communication between the helicopter, ground stations and other aircraft. It is installed externally on the helicopter fuselage and works as part of the onboard HF radio communication system, including Yadro-1 and related configurations where applicable. The antenna is a passive external component and requires correct installation, tensioning, insulation and matching with the radio equipment.

HF communication function of 8AT-7103-030 / 8AT.7103.030

The 8AT-7103-030 / 8AT.7103.030 antenna supports communication in the HF band, where radio signals can provide long-distance coverage depending on frequency, flight altitude, time of day and propagation conditions. In the helicopter communication system, the antenna transmits and receives signals for the onboard HF radio station. It does not perform signal amplification or automatic tuning by itself. Electrical matching is performed by the standard antenna matching unit of the radio system, such as the B5-YaR1 unit used with Yadro-1 equipment. Stable communication depends on the antenna condition, feeder integrity, grounding, insulation resistance and matching system operation.

8AT-7103-030 / 8AT.7103.030 as an external cable-type antenna

The 8AT-7103-030 / 8AT.7103.030 is constructed as a tensioned metallic cable antenna mounted between external attachment points on the helicopter fuselage. The assembly may include the antenna cable, front and rear end insulators, tensioning elements, shock absorbers, grounding elements and feeder entry components. The design must maintain mechanical stability during flight while preserving the required electrical characteristics of the antenna circuit. Since the antenna is exposed to airflow, precipitation, vibration and temperature variation, inspection should include cable condition, attachment points, insulators, tension and signs of corrosion or mechanical damage.

Installation of 8AT-7103-030 / 8AT.7103.030 on Mi-8 / Mi-17 helicopters

The 8AT-7103-030 / 8AT.7103.030 antenna is installed externally on Mi-8 family helicopters and related modifications. Typical application includes Mi-8, Mi-8T, Mi-8AT and Mi-17 configurations equipped with compatible HF radio communication equipment. The exact mounting arrangement depends on helicopter modification, installed radio set and aircraft technical documentation. The antenna is normally installed as a fuselage-mounted wire element with fixed attachment and tensioning points. During replacement or maintenance, the installation should be checked against aircraft drawings, feeder routing, insulator positions and the radio station matching equipment.

System integration of 8AT-7103-030 / 8AT.7103.030 with Yadro-1

The 8AT-7103-030 / 8AT.7103.030 antenna is associated with the Yadro-1 HF radio station family, including Yadro-1A and related designations where applicable. It works with the radio transmitter-receiver, antenna matching unit, feeder line and cockpit communication controls. The antenna provides the external radiating and receiving element, while tuning and matching are handled by the connected radio equipment. For normal operation, all system components must be compatible and serviceable. A defect in the antenna cable, feeder, insulator or matching unit can reduce transmission range, create unstable reception or affect transmitter loading.

Identification and ordering of 8AT-7103-030 / 8AT.7103.030

The antenna may be referenced as 8AT-7103-030, 8AT.7103.030, 8AT-7103-30, 8АТ-7103-30, 8АТ.7103.030, 8AT-7103-30-03, 8AT-7103-30SB or 8АТ-7103-30СБ. These designations refer to the same product type or closely related supply configurations, but the exact aircraft installation and set composition should be checked before ordering. For correct supply, it is useful to specify the helicopter type, installed HF radio station, required condition, completeness of the antenna kit, documentation requirements and whether mounting hardware, insulators or feeder components are needed.

Product Type: Aircraft HF wire antenna
Designation: 8AT-7103-030 / 8AT.7103.030
Alternative Designations: 8AT-7103-30, 8АТ-7103-30, 8АТ.7103.030, 8AT-7103-30-03, 8AT-7103-30SB, 8АТ-7103-30СБ
Function: Reception and transmission of HF radio signals
Application / Where Used: Aircraft HF communication systems
System / Installation Area: External antenna installation on helicopter fuselage
Compatible Aircraft / Equipment: Mi-8, Mi-8T, Mi-8AT, Mi-17 helicopters and related modifications according to aircraft documentation
Associated Radio System: Yadro-1, Yadro-1A and related HF radio communication systems where applicable
Frequency Range: 2.000–29.999 MHz, according to Yadro-1 HF communication band
Feeder Impedance: 50 Ohm
Transmitter Power Compatibility: Up to approximately 250–400 W depending on radio station mode and system configuration
Maximum Operating Altitude: Up to 6000 m
Communication Range: Approximately 1000–3000 km depending on propagation conditions, frequency, time of day and flight altitude
Antenna Design: Tensioned metallic cable antenna
Construction Type: Single-wire or dual-wire external cable antenna depending on installation configuration
Approximate Antenna Wire Length: About 10 m
Cable Material: High-strength aviation antenna cable, stainless alloy or corrosion-protected steel type depending on specification
Insulation Resistance, Normal Conditions: Not less than 20 MOhm
Insulation Resistance, High Humidity: Down to 1 MOhm where permitted by documentation
Matching Equipment: B5-YaR1 antenna matching unit or approved equivalent within the HF radio system
Set Composition: Antenna cable, front and rear end insulators, tensioning elements, shock absorbers, grounding elements and feeder entry components, depending on supply set
Assigned Resource: 1750 flight hours with one overhaul, where applicable
Time to First Overhaul: 1000 flight hours
Total Service Life: Up to 15 years
Storage Life: Up to 2 years in manufacturer packaging under normal storage conditions
Condition: As applicable
Technical Documentation: Aircraft technical documentation, equipment catalog, installation documentation and product passport if available

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Warranty
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