SB5-B1-YARII

SB5-B1-YARII band-pass filter subunit

SB5-B1-YARII is an electronic subunit used in the B1-YARII receiver-exciter of the Yadro-1 airborne HF radio station. The module functions as a band-pass filter and main high-frequency subblock in the receive and transmit paths. It provides preliminary selection of incoming radio signals, supports signal conversion in the receiver path and forms the excitation voltage required for the power amplifier block during transmission. The subunit is installed inside the B1-YARII parent assembly and is not used as a standalone aircraft radio unit.

Main high-frequency role of SB5-B1-YARII

The SB5-B1-YARII subunit works as one of the main RF-path modules in the receiver-exciter. In reception, it participates in the initial handling of incoming HF signals before they are passed to further selection and intermediate-frequency processing stages. In transmission, it supports formation of the signal that is later used by the power amplifier section of the radio station. This makes the module important for both receive and transmit operation of the Yadro-1 communication system.

Preliminary signal selection through SB5-B1-YARII

One of the main functions of SB5-B1-YARII is preliminary selection of radio signals entering the receiver-exciter. The band-pass filter section helps limit the signal path to the required frequency band and reduce unwanted out-of-band components before further processing. This preliminary selection supports stable receiver operation and prepares the signal for the next stages of the radio station. If the subunit is defective, the receiver-exciter may show poor selectivity, unstable reception or reduced performance in the HF communication band.

SB5-B1-YARII in the receive path of B1-YARII

In the receive path, SB5-B1-YARII works before the main signal selection and intermediate-frequency amplification stages. After preliminary selection and conversion, the signal is transferred to SB2-B1, where it passes through the main selection filters and IF amplifier stages. The signal then continues to SB4-B1 for detection and audio-frequency amplification. This position places SB5-B1 at the front part of the receiver-exciter signal chain, where the quality of initial RF filtering affects the following modules.

Transmit-path function of SB5-B1-YARII

In transmit mode, SB5-B1-YARII forms the excitation voltage for the B4-YaR1 power amplifier block. The module receives the prepared modulated signal from the receiver-exciter chain and supports its transfer toward the final power amplification section of the radio station. This function is required for correct transmitter operation in the Yadro-1 system. During troubleshooting, technicians should check SB5-B1 together with the modulator subunit, reference oscillator, power amplifier block, control circuits and interblock connections.

Identification and ordering of SB5-B1-YARII

The subunit may be referenced as SB5-B1-YARII, СБ5-Б1-ЯРII or as a DPF / band-pass filter subunit. Before ordering, the parent assembly, decimal number, condition and documentation set should be confirmed. The unit may be required for repair of the receiver-exciter, restoration of the Yadro-1 radio station, troubleshooting of receiver or transmitter faults, or spare parts stock for aircraft HF communication equipment. Applicability should be checked by the B1-YARII configuration and aircraft radio equipment documentation.

roduct Type: Band-pass filter / RF electronic subunit
Designation: SB5-B1-YARII
Russian Designation: СБ5-Б1-ЯРII
Alternative Designations: SB5B-B1-YARII, СБ5Б-Б1-ЯРII, DPF subunit, band-pass filter subunit
Decimal Number: И82.022.012-01
Function: Preliminary RF signal selection, receive-path conversion support and transmitter excitation formation
Application / Where Used: Yadro-1 airborne HF radio station receiver-exciter
System / Installation Area: B1-YARII receiver-exciter / high-frequency receive and transmit path
Associated Radio System: Yadro-1 airborne shortwave radio station
Compatible Aircraft / Equipment: Mi-8, Mi-17 and other aircraft or helicopters equipped with compatible Yadro-1 radio equipment
Parent Assembly: B1-YARII-1A; B1-IARP-1A; Б1-ЯРII-1А; Б1-ЯР2-1А
Module Role: Main high-frequency block of receive and transmit paths
Receive-Path Function: Preliminary selection of incoming radio signals and signal conversion before main IF processing
Transmit-Path Function: Formation of excitation voltage for B4-YaR1 power amplifier block in transmit mode
Output to Receive Path: SB2-B1 main signal selector / IF amplifier subunit
Associated Transmit Equipment: B4-YaR1 power amplifier block
Category: Aviation radio communication equipment / electronic subunit
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, Yadro-1 radio station documentation, B1-YARII receiver-exciter documentation, test records and setup documentation if available

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.