Overview: AOR AR5700D Digital Communications Receiver

The AR5700D is AOR’s flagship wideband receiver, engineered for professional-grade signal monitoring, decoding, and analysis. It supports both analog and digital modes, making it ideal for government, commercial, and advanced hobbyist applications.

Key Features

• Frequency Coverage: 9 kHz to 3.7 GHz continuous

• Digital Modes Supported:

  • TETRA: Direct Mode (T-DM), Traffic Channel (T-TC), Trunked Mode with GSSI filtering

  • P25 Phase 1 & Phase 2: Conventional and trunked decoding

  • DMR: Tier I and II

  • NXDN, DPMR, MOTOTRBO, D-STAR, YAESU C4FM, ALINCO EJ-47, D-CR

• Analog Modes: AM, FM, FM Stereo, SSB (USB/LSB), CW, synchronous AM, analog I/Q, FM video

• Digital I/Q Output: Up to 2 MHz bandwidth for external analysis

• Display: Backlit LCD with up to 10 MHz span

• Control Software: AR-IQ III for PC-based control, signal hunting, and logging

• Memory: 2000 channels across 40 customizable banks

• Build: Rugged metal chassis with carry handle, tilt bail, and prominent front panel controls

Internal Architecture

• Signal Processing Powerhouse:

  • 4× RENESAS SH2 CPUs

  • 3× Analog Devices Blackfin DSPs

  • 1× ADSP-2185 DSP

  • 4× Intel (Altera) Cyclone FPGAs

This architecture enables real-time demodulation, decoding, and filtering of complex digital signals with high accuracy and low latency.

Use Cases

• TETRA Monitoring: GSSI user group filtering allows selective decoding of trunked networks

• Public Safety & Utility Monitoring: APCO P25 Phase 1 & 2 decoding for emergency services

• Commercial & Industrial Surveillance: DMR, MOTOTRBO, NXDN for site communications

• Amateur & Research Applications: Full analog and digital spectrum coverage

Limitations

• Firmware Updates: Must be sent to AOR Japan—no user-side update capability

• Encrypted P25 Audio: Not muted automatically, which may disrupt scanning

• Memory Editing Software: Slow and cumbersome for bulk programming.