P-504N

P-504N ground wire voice recorder

P-504N is a specialized ground-based wire recorder designed for recording and playback of voice and audio information on wire recording media used in airborne recording equipment. The recorder is intended for ground support, analysis and decoding of recordings obtained from aircraft wire recorders. It may also be used for independent voice recording from a microphone, radio receiver, communication line or other compatible audio source.

Playback of aircraft wire recorder information

The P-504N is used to reproduce and analyze recordings made by onboard wire recorders such as P-503B and MS-61B. In aviation support use, the device allows ground personnel to play back crew voice communications and audio information recorded during flight. This makes the recorder suitable for post-flight analysis, investigation support and technical review of information stored on wire recording media.

Recording function of P-504N

In addition to playback, the P-504N can perform its own recording of speech and audio signals. The recorder can be used at stationary and mobile communication points for continuous recording from a microphone or communication line. Depending on configuration, the system may support recording from radio receivers, telephone lines or other connected audio circuits. Some versions may support voice-activated recording functions according to modification and documentation.

P-504N recording medium and operation

The P-504N uses a steel wire recording medium. A wire spool may contain approximately 7 km of wire and provide recording duration of up to 9 hours. The recorder operates in the speech frequency range and supports wire movement speeds used for compatibility with airborne wire recording systems. Full rewind time may reach up to 40 minutes, depending on the installed reel, wire condition and operating mode.

Ground and special-purpose application of P-504N

The recorder is applied at stationary and mobile ground communication points, on special-purpose vehicles and on light marine craft as part of ground communication and analysis equipment. It may be used by aviation ground services, maintenance organizations, communication units and special-purpose operators that need to record, reproduce or analyze speech information from wire media. The P-504N replaced earlier wire recorder equipment such as MN-61 in applications where updated ground playback and recording capability was required.

P-504N modifications and identification

The product may be referenced as P-504N, P-504NU or P-504NZ. P-504N is the base ground model. P-504NU is associated with remote control capability and playback rollback / repeat functions. P-504NZ is associated with low-impedance inputs and outputs for specialized equipment. For correct supply, it is useful to specify the exact modification, power supply requirements, recording speed compatibility, required condition, completeness and documentation set.

Product Type: Ground wire voice recorder
Designation: P-504N
Alternative Designations: P-504NU, P-504NZ
Function: Recording and playback of wire-based voice information
Purpose: Playback, analysis and independent recording of speech and audio information on wire media
Application / Where Used: Ground communication and analysis equipment
System / Installation Area: Ground-based voice recording and playback systems
Compatible Aircraft / Equipment: Aircraft wire recorders P-503B, MS-61B
Related Earlier Model: MN-61
Recording Medium: Steel wire
Wire Length: Approximately 7 km
Recording Duration: Up to 9 h
Frequency Range: 300 to 3400 Hz
Recording Speed: 100 mm/s; 145 to 195 mm/s
Rewind Time: Up to 40 min
Power Supply: 220 V AC 50 Hz or 115 V AC 400 Hz
Dimensions: 338 × 240 × 220 mm
Modification P-504N: Base ground model
Modification P-504NU: Version with remote control and playback rollback / repeat function
Modification P-504NZ: Version with low-impedance inputs and outputs for specialized equipment
Installation / Use Locations: Stationary and mobile communication points; special-purpose vehicles; light marine craft
Condition: As applicable
Technical Documentation: Product passport and operating manual

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In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

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.