FURUNO PM-31 X-Band Radar Performance Monitor – e2v PM31/B3RX1626 & PM31/B3RX1825FR | Marine Radar Spare Parts

Original SM MARINE SERVICE™ photograph of an e2v radar performance monitor mounted inside a marine radar scanner housing. Its device label identifies PM31/B3RX1825FR.

Product Information

Identification note: The two photographed units show different e2v device codes and serial numbers. The presence of a PM-31 designation does not automatically establish direct interchangeability.

Product Introduction

The FURUNO PM-31 X-Band Radar Performance Monitor is a radar test and monitoring component used in compatible FURUNO marine navigation radar systems.

The PM-31 helps radar operators assess transmitter and receiver performance through a dedicated performance-monitoring function. When activated, the radar display presents performance-monitor indications that can be compared with the reference appearance established during installation.

A weak, changed or missing indication can suggest deterioration in radar performance or a problem within the monitoring system. Further diagnosis is required before concluding that the magnetron, receiver or PM-31 assembly is faulty.

The supplied photographs show two e2v Technologies devices with different identification codes, including PM31/B3RX1626 and PM31/B3RX1825FR.

SM MARINE SERVICE™ supports international sourcing enquiries for FURUNO PM-31 radar performance monitors, related scanner components and marine navigation radar spare parts.

Website: www.smmarineservice.com

Original PM31/B3RX1626 Identification

Close-up of the original PM31/B3RX1626 identification label, showing serial number 0728046 and the marked electrical-control terminals.

The first photograph identifies the device as PM31/B3RX1626, manufactured by e2v Technologies in the United Kingdom.

The label shows the electrical-interface names CONT, +12V, -12V, GND, TRIG and ENABLE. These markings should be matched against the correct wiring information rather than used as an installation procedure by themselves.

What Is a Marine Radar Performance Monitor?

A radar performance monitor is a test device that helps establish whether radar transmitter and receiver performance remains consistent with the system's expected characteristics.

The monitor interfaces with the radar's radio-frequency system and provides a controlled test response. The radar display presents the response in a recognizable form, often including performance arcs.

In the FURUNO FAR-2107/2807 X-band radar family, PM-31 is the documented performance monitor type.

The PM-31 is intended to support radar performance assessment; it is not a substitute for full radar calibration, maintenance, diagnostics or operational verification.

Main Features

• Designed for compatible FURUNO X-band radar arrangements.

• Supports transmitter and receiver performance checking.

• Produces recognizable performance-monitor indications on the radar display.

• Installed inside the radar scanner/antenna assembly.

• Equipped with RF coaxial connections.

• Incorporates designated control, trigger and enable interfaces.

• Uses manufacturer-specific e2v device identification codes.

• Applicable to marine radar performance monitoring during operation and maintenance.

• Helps technicians investigate suspected degradation when compared with the correct reference indications.

The exact electronic operation, reference thresholds and individual-device configuration must be confirmed from the appropriate manufacturer documentation.

Main Technical Specifications

The PM-31 kit code is documented by FURUNO. It should not be confused with the e2v manufacturer's specific device identifiers.

e2v PM31/B3RX1825FR – Second Photographed Unit

Close-up of the second supplied assembly, identifying PM31/B3RX1825FR and serial number 1546039.

The second unit carries the designation PM31/B3RX1825FR and differs from the PM31/B3RX1626 shown in the first photograph.

Buyers must match the exact device marking, antenna system and radar configuration before selecting a replacement.

Main Components & Associated Part Numbers

PM-31 Performance Monitor RF Module

The central monitoring module interfaces with the radar's transmitter and receiving system and contributes to producing the performance-monitor test indication.

The actual internal component arrangement should be inspected using the relevant manufacturer's service procedures.

RF Coaxial Cable Assembly

The supplied photographs show an RF coaxial connection to the performance-monitor assembly.

Connection integrity is important because damage or poor contact can affect the test signal and lead to misleading performance indications.

Electrical Control Interface

The device label identifies six connection functions:

• CONT

• +12V

• -12V

• GND

• TRIG

• ENABLE

These are markings visible on the equipment. No pin numbering, operating logic or test voltages have been assumed.

FURUNO PM-31 Installation Kit

FURUNO identifies a PM-31 performance-monitor kit with code 008-080-438 for the FAR-2107/2807 X-band radar family.

The associated manufacturer installation information identifies equipment such as a scanner cover assembly, connector assembly, gasket and installation hardware. Kit composition should be confirmed before purchasing individual components.

Related PM-51 Performance Monitor

The FURUNO PM-51 is associated with compatible S-band radar equipment. It serves a similar monitoring purpose but must not be treated as interchangeable with the X-band PM-31.

Compatible FURUNO Radar Models

FURUNO's radar documentation associates PM-31 with X-band installations in the FAR-2107/2807 series.

Relevant radar models for compatibility enquiries include:

The specific PM-31 device version, scanner arrangement, available connections and installation requirements must all be verified. A model-family association is not a guarantee of direct interchangeability.

Marine Applications

The FURUNO PM-31 is relevant to marine navigation radar installations aboard commercial vessels, including merchant ships, tankers, bulk carriers, container ships and offshore support vessels.

Its principal application is assessing radar performance through the equipment's built-in monitoring function.

For vessel operators, the monitor provides a useful means of observing performance changes between maintenance checks. It can also support qualified technicians investigating radar transmission or reception concerns.

Whether the particular installation satisfies applicable radar performance-monitoring requirements depends on the vessel, radar approval and configuration.

Common Problems & Troubleshooting

The presence of these symptoms does not prove that the PM-31 itself has failed.

Checking Radar Performance

In FURUNO's documented PM procedure, the radar uses a specified configuration to present performance-monitor indications. Technicians compare these indications with established reference values to assess whether transmitter or receiver performance may have changed.

For the applicable FAR-21x7/28x7 equipment, FURUNO documentation describes performance-monitor arcs during the test and adjustment procedure.

 

The actual result must be interpreted against the relevant radar's initial performance reference and manufacturer instructions.

Safety Precautions

Marine radar equipment contains high-voltage circuits and produces microwave radiation. Its antenna may also move mechanically.

Only qualified radar service personnel should inspect or replace internal RF assemblies. The equipment must be correctly isolated, and applicable electrical, RF and electrostatic-discharge precautions must be followed.

Never operate a radar transceiver with RF shields or protective assemblies incorrectly fitted.

Maintenance Tips

The following maintenance practices support reliable operation:

• Inspect accessible RF cables and connectors for corrosion or damage.

• Examine the PM module's enclosure and mounting hardware.

• Check for signs of moisture ingress.

• Record the device model and serial number.

• Compare current performance-monitor indications with approved reference records.

• Protect ESD-sensitive components during servicing.

• Verify correct component identification before replacement.

• Document all repairs and performance checks.

Do not change performance-monitor adjustment settings merely to conceal degraded radar performance.

Spare Parts & Replacement Availability

SM MARINE SERVICE™ supports international enquiries for FURUNO PM-31 radar performance monitors and related X-band marine radar spare parts.

Potential sourcing requirements include:

• Complete PM-31 performance-monitor assembly.

• e2v PM31/B3RX1626.

• e2v PM31/B3RX1825FR.

• Compatible RF coaxial cables and connectors.

• Appropriate electrical interface components.

• Verified PM-31 installation-kit parts.

• Related FURUNO radar transceiver components.

• Other marine radar performance-monitor assemblies.

New, used, refurbished, reconditioned or tested-working equipment may be sourced depending on availability.

The actual operating condition, test status and stock quantity of the photographed PM-31 devices have not been independently confirmed.

Information Required for Quotation

Customers should provide the exact performance-monitor device number, a clear photograph of the nameplate, the FURUNO radar model, scanner or antenna type and any relevant fault description.

If requesting a complete assembly, confirm the required cables, connectors and mounting configuration.

SM MARINE SERVICE™ also accepts sourcing enquiries for performance-monitor equipment used with other radar brands, subject to exact identification and availability.

Worldwide enquiries: www.smmarineservice.com

Why Marine Radars Still Require Performance Monitors

A marine radar may appear to operate normally while transmission or receiver performance gradually changes.

A properly configured performance monitor helps operators identify changes in the radar's expected test response and determine when additional maintenance investigation may be necessary.

For ships operating established FURUNO radar systems, maintaining compatible performance-monitor hardware is important for continued servicing and system integrity.

When replacing a PM-31, it is necessary to confirm that the hardware matches the installed radar rather than relying solely on a visually similar assembly.

Frequently Asked Questions

What is the FURUNO PM-31?

It is an X-band marine radar performance monitor used in compatible FURUNO radar installations.

Who manufactures the PM-31 RF device?

The supplied assemblies carry e2v Technologies identification labels and are marked Made in UK.

What is PM31/B3RX1626?

It is the manufacturer-specific device marking visible on one supplied performance-monitor unit.

What is PM31/B3RX1825FR?

It is a different e2v device marking visible on the second supplied assembly.

Are both device versions interchangeable?

Interchangeability has not been established. The exact radar installation and device specifications must be checked.

What is FURUNO code 008-080-438?

It is the documented ordering code for the PM-31 performance-monitor kit in applicable FURUNO radar documentation.

Which radars use PM-31?

FURUNO documentation associates PM-31 with the FAR-2107/2807 X-band radar family, including related model configurations.

What causes missing radar performance-monitor arcs?

Possible causes include monitor-related faults, cable problems, incorrect settings or transmitter/receiver issues. Qualified diagnosis is necessary.

Can PM-51 replace PM-31?

Direct replacement should not be assumed. PM-51 is associated with S-band radar equipment rather than the X-band PM-31 application.

Where can I buy FURUNO PM-31 spare parts?

Contact SM MARINE SERVICE™ with the exact device number and radar configuration for a quotation.

Can I request used or refurbished equipment?

Yes. Sourcing enquiries can cover used, refurbished, reconditioned or tested-working equipment where available.

Does SM MARINE SERVICE™ offer worldwide supply?

International sourcing and shipping enquiries are accepted, subject to availability and delivery arrangements.

Short Product Description

The FURUNO PM-31 Radar Performance Monitor is an X-band marine radar monitoring component used in compatible FAR-2107/2807 series radar installations. The supplied photographs identify e2v Technologies units marked PM31/B3RX1626 and PM31/B3RX1825FR, with serial numbers 0728046 and 1546039 respectively. The PM-31 supports radar transmitter and receiver performance assessment through a dedicated monitoring function. SM MARINE SERVICE™ assists international buyers seeking complete performance-monitor assemblies, compatible replacement parts and marine radar spares. Exact compatibility, product condition, availability and test status must be verified before purchase.

SM MARINE SERVICE™

Marine Automation & Navigation Equipment Supplier

Available Equipment Conditions:
New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment

Specific product condition and availability are subject to confirmation.

Stock Locations:
Bangladesh • China

Services:
Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Contact Information

SM MARINE SERVICE™
Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com

For quotations involving FURUNO PM-31 radar performance monitors, e2v RF assemblies, related marine radar spare parts or alternative performance-monitor equipment, contact SM MARINE SERVICE™ with your model information, nameplate photographs and shipping destination.

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