M45203

M45203 module in radio altimeter equipment

The M45203 is a microwave module designed for operation in airborne radio altimeter equipment. It is used in the microwave signal path of the A-037 radio altimeter and related receiver equipment. The module is not a complete radio altimeter and does not calculate or display altitude by itself. Its role is to operate as part of the SHF circuitry, where stable microwave signal parameters are required for correct interaction between transmitting, receiving and processing sections of the radio altimeter.

M45203 in the A-037 radio altimeter

The M45203 module is included in the radio component set of the A-037 radio altimeter. It can be used in A-037-1A, A-037-1V and A-037-1G configurations, depending on the installed system version and equipment documentation. In the A-037 system, the module works inside the microwave path and supports the required output power, frequency stability and electrical operating modes. Because it is part of the radio-frequency section, its condition can affect signal quality, receiver interaction and overall radio altimeter performance.

Application of M45203 in PP-5M receiver

In addition to A-037 radio altimeter equipment, the M45203 is also used in the PP-5M receiver. In this application, it operates as part of the microwave signal chain of the receiver equipment. For supply or repair, the exact installation should be confirmed by the passport and the equipment documentation. A module with the same designation may be used in different assemblies, so the final match should be made by part number, circuit position, operating parameters and technical documentation.

Microwave operating role of M45203

The M45203 is intended for work in the SHF signal path of continuous-wave FM radio altimeter equipment. Its electrical parameters provide compatibility with other microwave units of the system. The module supports the operating frequency area used by the radio altimeter and provides the required signal level for the next stages of the equipment. It should be checked together with the connected microwave modules, receiver or transmitter circuits, antennas, coaxial lines and control circuits, rather than treated as an isolated part.

Electrical characteristics of the M45203 module

According to the provided technical data, the M45203 operates from a +15 V supply. The collector current is specified as 280–360 mA, while the control circuit current is up to 20 mA. Output power is not less than 7 mW. The center frequency is 4270 MHz, with an operating frequency of 4330 MHz and a bandwidth of 20 MHz. These values should be verified against the passport of the actual module before installation, because radio-altimeter equipment may require strict matching of microwave parameters.

Construction of the M45203 module

The M45203 is manufactured in a shielded metal housing. The housing includes power supply, control and microwave signal terminals for integration into the radio altimeter equipment. Shielding is important because the module operates in the SHF range and must remain protected from external interference and unwanted coupling. During inspection, attention should be paid to housing condition, connector integrity, terminal condition, corrosion, mechanical damage and signs of improper handling or overheating.

Operation and supply notes for M45203

Operation of the M45203 is permitted only according to the product passport, technical conditions and operating instructions. Reliability, minimum operating life and storage life are defined by the manufacturer and confirmed by passport data. For procurement, the full designation M45203 should be used. Alternative designations such as M-45203 or M 45203 may be useful in correspondence, but the final identification should be based on the exact marking, technical documentation and compatibility with the target A-037 or PP-5M equipment.

Product Name: M45203 Microwave Module
Part Number: M45203
Product Type: Microwave / SHF module
Function: Operation within the microwave signal path of a radio altimeter
Application / Where Used: A-037 radio altimeter equipment
Compatible Versions: A-037-1A; A-037-1V; A-037-1G
Additional Application: PP-5M receiver
Operating Role: Microwave signal path module for stable SHF operation and interaction with other radio-altimeter microwave units
Supply Voltage: +15 V
Collector Current: 280–360 mA
Control Circuit Current: Up to 20 mA
Output Power: Not less than 7 mW
Center Frequency: 4270 MHz
Operating Frequency: 4330 MHz
Bandwidth: 20 MHz
Weight: Not more than 450 g
Storage Life: 12 years
Minimum Operating Life: Not less than 2000 hours
Design: Shielded metal housing
Condition: As applicable
Alternate Designations: M45203; M-45203; M 45203
Technical Documentation: Product passport

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