Aurora AU-510

500W HF/6m Software-Defined Transceiver – Without Screen

An entirely new approach to high-power amateur radio. The FlexRadio Aurora AU-510 combines a 500W HF transmitter, direct-sampling SDR receiver, automatic antenna tuner and AC power supply into one compact system, designed for seamless SmartSDR computer and remote operation.

Everything You Need. No Unnecessary Screen.

The AU-510 is the screenless model in the Aurora family. It delivers the same 500W HF power and integrated high-efficiency transmitter technology as its screen-equipped equivalent, but operates through compatible SmartSDR software or an optional external Maestro controller. An ideal choice for computer-based shacks, dedicated SDR stations and remote installations.

The complete 500W HF station, in one chassis

The FlexRadio Aurora AU-510 fundamentally changes the way a high-power HF station can be assembled. Rather than relying on a separate SDR transceiver, linear amplifier, automatic antenna tuner and high-current DC power supply, Aurora integrates these components into one factory-engineered platform.

Its innovative polar-modulation transmitter delivers up to 500W PEP on supported HF bands and 200W PEP on 50MHz, while the 16-bit direct-sampling receiver and SmartSDR ecosystem provide flexible operating capabilities for DX, contesting, digital modes and remote operation.

The AU-510 features a single Spectral Capture Unit (SCU) supporting two independently configurable slice receivers. For operators who prefer controlling their radio from a computer or external Maestro, it provides an exceptionally capable high-power SDR without the expense of an integrated touchscreen.

Polar modulation makes high power more efficient

Aurora uses polar modulation rather than a conventional linear RF amplifier. The system separates a transmitted signal's amplitude and phase information and processes these components through high-efficiency switching amplification with sophisticated digital control.

With approximately 80% nominal transmitter efficiency, Aurora converts substantially more electrical energy into useful RF output instead of heat. This is a major reason why a complete 500W station can fit in a chassis comparable in size to many lower-power transceivers.

Actual efficiency and power consumption depend on operating mode, RF output and duty cycle.

Two receivers from one powerful SCU

The AU-510's single Spectral Capture Unit uses a high-resolution 16-bit analogue-to-digital converter operating at 122.88 Msps. Its SDR architecture provides two slice receivers, enabling operators to independently configure two frequencies and operating modes within the shared RF capture range.

Third-order amateur-band preselectors and sophisticated digital signal processing help control unwanted signals and deliver strong receiver performance. The AU-510 provides the important tools required for split-frequency DXing, digital-mode operation and general HF listening.

SmartSDR puts the entire station at your fingertips

The AU-510 is designed for operation with FlexRadio's SmartSDR ecosystem, giving users sophisticated receiver controls, panadapters, waterfall displays, transmit settings and audio routing through a compatible control device.

Whether using a dedicated shack computer, compatible external Maestro controller or a supported remote client, the software-defined interface provides substantial flexibility. Operators can configure their display and operating environment to suit everyday DXing, CW, data modes or more specialised station requirements.

500W automatic antenna tuning included

Unlike many SDR transceivers that require an optional tuner, the Aurora AU-510 includes a built-in high-power automatic antenna tuner capable of matching suitable antenna systems within its specified 3:1 SWR range.

The radio also provides two high-power antenna connections, one dedicated receive-only input and a transverter/exciter connection. These allow flexible station configurations without the need for multiple separate transceivers.

Precision frequency control with integrated GNSS

The AU-510 includes an integrated multi-system GNSS receiver supporting GPS, Galileo, GLONASS, QZSS and SBAS. With suitable satellite reception, the system provides highly accurate frequency reference without the need for repeated manual adjustments.

FlexRadio specifies approximately 0.001ppm GNSS-referenced frequency stability and 0.5ppm with the internal TCXO. A separate high-performance GPSDO option can provide a precision 10MHz reference output for external station equipment.

AU-510 vs AU-520: which is right for you?

Both models are supplied without an integrated screen and share the same maximum RF output, polar-modulation transmitter, automatic antenna tuner, wide-range AC power supply and SmartSDR platform. The AU-520 adds a second independent SCU and additional receiver resources for more demanding operating requirements.

Built for modern digital operation

The AU-510 supports SSB, CW, AM, SAM, FM, RTTY and compatible software-defined digital modes. SmartSDR's DAX audio and IQ interfaces provide convenient connectivity for supported digital-mode applications.

The Aurora platform also provides support for SmartSignal adaptive predistortion and Controlled Envelope SSB (CESSB), with individual feature availability dependent on the installed SmartSDR software and firmware.

High-power operation without an external PSU

Aurora's internal supply accepts 80–264V AC at 47–63Hz, eliminating the need for a conventional high-current 13.8V DC power supply. This is particularly convenient for computer-controlled and remote installations, where minimising the number of separate devices simplifies station wiring.

The manufacturer specifies approximately 35W power consumption during reception and 675W during transmission under its stated operating conditions.

A natural fit for the modern SDR station

Important information before ordering

Screenless model: The AU-510 has no built-in display or integrated Maestro controls. A compatible external client is required.

Maximum RF output: Up to 500W PEP HF and 200W PEP 6m. Antennas, cables and connected equipment must be suitably rated.

Integrated antenna tuner: Matches suitable antennas within the stated 3:1 SWR range.

Power supply: Operates from 80–264V AC. Direct 13.8V DC operation is not supported.

GPSDO: Standard GNSS frequency stabilisation is included; the high-performance GPSDO is optional.

Firmware: Certain features and software clients depend on the installed SmartSDR version and applicable licences.

Aurora User Guide

For detailed operating instructions, SmartSDR setup and installation guidance, consult the official FlexRadio Aurora user guide.