Expert Electronics SunSDR2-DX Gen 6 - HF/6M/VHF Transceiver
SKU Part Number: SUNSDR2-DX
The SunSDR2 DX transceiver is the smallest 100W 160M-6M + 2M HF/VHF SDR transceiver in the world, which makes it an ideal companion for your future...
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Special Price £1,999.99 Regular Price £2,299.99
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The SunSDR2 DX transceiver is the smallest 100W 160M-6M + 2M HF/VHF SDR transceiver in the world, which makes it an ideal companion for your future contests and DXpeditions. It is based on a popular, well-known SunSDR2 PRO model. On top of all our previous radios' functionality, the SunSDR2 DX transceiver offers new features, such as compact hardware design, active cooling, improved power supply system and dedicated connector for a native external ATU. The upgraded hardware design coupled with the ExpertSDR2/3 software makes this high-performance SDR transceiver an outright base station for any DXpeditions and home use.

Hardware improvements in comparison to SunSDR2 PRO:

  • TX IMD3 ~37 dB across all HF bands, with 100W output power
  • HPF for VHF (100 MHz) to eliminate strong out-of-band stations coming from HF
  • LPF for HF (70 MHz) to eliminate strong out-of-band stations coming from VHF
  • New VHF LNA chip - PGA103+
  • New high-performance built-in stereo audio codec 24-bit with 114 dB dynamic range (CS4272)
  • Has a dedicated connector for an external tuner - AAT-100
  • Antenna switch supports Predistortion without external devices

Hardware evolution of SunSDR2 DX is described in the User Manual, section 2.2.1.

Main capabilities

  • Independent RX path based on DDC (Direct Down-Conversion) architecture
  • Independent TX path based on DUC (Direct Up-Conversion) architecture
  • Output power: 100W on HF, 80W on 6M and 8W on 2M
  • 2 software RXs + SubRX for each of them (4 slices total) + independent wideband Bandscope up to 80 MHz
  • Remote control operation, using it, you connect PTT and CW-key to the E-Coder panel. Microphone and E-Coder are connected to the remotely set up PC
  • TCI interface for seamless connection with third-party software, the list of software with TCI support
  • Professional TX processing module provides the most advanced tuning capability for voice operation
  • ExtCTRL connector to control external devices with 8 powerful keys with open collector
  • ALC connector for external power amplifiers*
  • Supports use of VHF transverters
  • An opportunity to use the transceiver as a signal generator via DAC OUT connector (SMA connector)
  • An opportunity to use external filters in the middle of the RF path, using ADC IN and RX OUT (SMA connector)
  • Monitoring delay in CW mode is about 2-3 ms
  • Input for external 10 MHz reference oscillator
  • An opportunity to use the transceiver in SO2V mode
  • Full duplex or half-duplex modes**
  • Antenna switch with 2 HF antenna connectors and separate VHF antenna connector (Mini UHF connectors)
  • Internal power-meter for HF and VHF bands and SWR-meter for HF band
  • Ethernet LAN interface provides a fast and reliable connection to PC

* ** These functions are supported by the transceiver's hardware, but are not implemented in the ExpertSDR3 software.

 

Architecture description

Block diagram SunSDR2DX

 

SunSDR2 DX complete set

  • Transceiver SunSDR2 DX
  • External fan, size 140 x 140 mm
  • LAN-cable for connection to a local network (1.8m)
  • Power cable for connection to a power supply (2m)
  • Audio-adapters JACK 6.3mm to JACK 3.5mm (2 pcs.)

 

Additional accessories:

RF ADC, bit @ MHz 16 @ 160
ADC type LTC2209
RX Frequency range, MHz 0.1...65; 95...155
Independent software receivers 2 + 2 SubRX
Sample rate, kHz @ bit 39; 78; 156; 312 @ 24
Bandscope, MHz 80
RX HF filters, MHz (LPF: 65 or 9 x BPF) + constant LPF: 70
RX VHF filters, MHz (WideRX: 95-155 or SAW filter for 2M: 144-148) + constant HPF: 100
BDR on HF, dB 130
BDR on VHF, dB 129
Sensitivity, uV 0.2
DR IMD3, dB 110
RMDR, dB 119
ATT/Preamp, dB -20; -10; 0; +10
VHF LNA, dB 27
RF DAC, bit @ MHz 14 @ 640
TX Frequency range, M All amateur bands 160-6; 2
Output power on HF, W 100
Output power on 6M, W up to 80*
Output power on VHF, W 7 (up to 8)
TX IMD3 on HF, dB 37 on HF / 30 on VHF
Local oscillator TCXO, MHz +/- ppm 20 +/- 0.5
External 10 MHz oscillator input +
Built-in audio codec, bit / Dynamic Range, dB 24 / 114
RF input/output 2HF, 1VHF (Mini_UHF)
ADC IN, DAC OUT (SMA)
PC interface LAN 100 Mbit
DC voltage range in RX/TX, V 8...14.8 / 10...14.8
Recommended DC voltage, V 13.8
Current consumption RX/TX, A 1.2 / 24
Power consumption RX/TX, W 16.5 / 330
Operating temperature, �C/�F 0...+50/ +32...+122
Dimensions L x W x H, cm/inches 18.5 x 16.5 x 10.5/ 7.48 x 6.69 x 3.14
Weight, kg/lbs 1.8/ 3.96

* 80W until 53MHz, then output power is slightly decreased.
Specifications are subject to change without notice or obligation and specifications are only guaranteed within the amateur radio bands.

Gen6.0
Date Batch Serial Numbers Data

Feb 2026

1st, 2nd China

5th Russia

 

  • Optimized RF circuitry from the DAC to the power amplifier, resulting in a significant reduction in harmonic levels.
  • Upgraded 6M low-pass filter, resulting in additional harmonic suppression.
  • Upgraded 2M low-pass filter, resulting in a significant reduction in power loss.
  • Increased sensitivity of microphone inputs Mic1 by 4.2 times, Mic2 by 2.13 times.
  • Output power at the DAC OUT connector increased from +4 dBm to +9 dBm.
  • Optimized the VHF amplifier's BIAS node to improve stability.
Gen5.6
Date Batch Serial Numbers Data

Aug 2023

Oct 2023

June 2024

8th TW

3rd RU

4th RU

EED062923XXXXX

EED063523XXXXX

EED061724XXXXX

  • Improved resilience of the PA input supply line.

Certain SunSDR2 DX units from earlier batches may have hardware upgrades from later revisions, rendering them Gen5 and newer.

Gen5.5
Date Batch Serial Numbers Data

Oct 2022

2nd RU

EED063122XXXXX

  • Improved structure of 80, 10, 2M TX filters.
Gen5
Date Batch Serial Numbers Data

Dec 2022

7th TW

EED064622XXXXX

  • Redesigned TX filter of the DAC chip, providing better TX signal linearity.
  • Redesigned PA input band pass filter, improving linearity of the PA operation.
  • Improved structure of 160, 6M TX filters.
  • More resilient RX/TX switching node on PCB.
Gen4
Date Batch Serial Numbers Data

Dec 2021

6th TW

EED064421XXXXX

  • Slight improvement of the RX path.
Gen3
Date Batch Serial Numbers Data

July 2020

3-4-5th TW

1st RU

EED062920XXXXX

EED060121XXXXX

EED062021XXXXX

  • Improved TX IMD3 up to ~37 dB across all HF bands, with 100W output power.
  • Output power on 6M band has been increased up to 80W.
  • Improved SDR PCB protection from crosstalks and protection for the supply chain.
  • Added ferrite bead on the flex-cable connecting PA and SDR PCBs for more stable operation with external ATU.
  • Added filtering of the headphones' connector.
Gen2
Date Batch Serial Numbers Data

Dec 2019

2nd TW

EED065119XXXXX

  • Redesigned heatsink, with thinner and more frequent high effective grill.
  • Improved temperature sensor placement for more accurate temperature readings.
Gen1
Date Batch Serial Numbers Data

Nov 2019

1st TW

EED064219XXXXX

NA


pdf Terms of the product's warranty


pdf CMIIT certificate


pdf CE Declaration of Conformity


pdf "Setting up SunSDR2 PRO for DUMMIES" by Pete Parisetti, MM0TWX
pdf El primer procedimiento 11-09-19


ATU connector pin-out


pdf User Manual Addendum (UMA), by Erik EI4KF

pdf Adenda del Manual del Usuario version 6.12 12-05-21


Configuring SunSDR2 for Acom 600S PA (also or 700S and 1200S)


 

Useful diagrams


pdf ExtCtrl to SPE Expert PAs connection diagram


pdf ExtCtrl to ACOM PAs connection diagram


pdf ExtCtrl to EB104 connection diagram
Recommended by EB104 manufacturer

pdf ExtCtrl to EB104 connection diagram with relay


pdf ExtCtrl to SPE via S-BOX v2.1 (block-diagram)

pdf ExtCtrl to SPE via S-BOX v2.1 (schematic-diagram)


pdf SO2V operation

pdf SO2V operation with SDC
Both diagrams can be used for creating two working places with a single SunSDR2 PRO/DX transceiver.

Warning! Software is device-specific! Don't mix software with unsuitable hardware, it may lead to issues that are not covered by warranty!

 Windows


installer ExpertSDR2 v.1.3.1 Update11_SunSDR2_DX
installer ExpertSDR2 x64 v.1.3.1 Update11_SunSDR2_DX
SDR firmware v. 72 dd: Fall 2021
PA firmware v. 12 dd: July 2020
Published on 12-10-2020
pdf ExpertSDR2 1.3.1_Release_Notes
ExpertSDR2 1.3.1_Update 11_Release_Notes

Warning!
To use the ExpertSDR2 software, please install the Visual Studio Redistributable 2017 either from the ExpertSDR2 installer or from the official Microsoft website:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

 

 Linux x64


installer ExpertSDR2 v.1.3.1 Update11
Published on 13-10-2021

Warning!
ExpertSDR2 tested on Ubuntu 20.04 x64.


mac oc x macOS


installer ExpertSDR2 v.1.3.1 Update11
Published on 14-10-2021

Warning!
ExpertSDR2 was tested on the latest macOS release. ExpertSDR2 might crash during the closing, but it doesn't affect software operation at all

ExpertSDR3 minimum system requirements

  • CPU: Quad-core Intel Core (i3/i5 or higher), or respective AMD
  • RAM: 8 GB
  • Graphics: DirectX 11 or higher (Windows only)
  • Add-on Software: Latest Microsoft Visual C++ Redistributable (Windows only)
  • Network: 100 Mbit/s direct LAN (WLAN not recommended for stability)
  • Pro-tip: If ExpertSDR3 shows an error, reinstall Visual C++ as Administrator (Windows only)

Supported OS:

  • Windows 10 (1809 or later) x86_64, or Windows 11 x86_64
  • Ubuntu 22.04 x86_64, Ubuntu 24.04 x86_64, arm64
  • macOS 13.0 or higher (including macOS 15) x86_64, x86_64h, arm64

ExpertSDR3 software is being tested on the latest versions of Windows 11, Linux Ubuntu 24.04, and macOS 15 (with ARM CPU).
To report software bugs, please consider using this page.

 

ExpertSDR3 and Expert Remote System (ERS)

ExpertSDR3 is a next-generation software suite engineered to provide a powerful, intuitive interface for modern SDRs. Built on a high-performance, cross-platform architecture, it delivers a professional command centre experience featuring high-fidelity audio, lightning-fast spectrum visualisation, and advanced signal processing.

While ExpertSDR3 is a world-class local controller, its true power is unlocked as the flagship component of the Expert Remote System (ERS). This comprehensive, software-defined environment allows you to bridge the gap between the radio and operator, placing the full capability of a high-end radio shack in your hands - anywhere in the world.

Official website: https://cloud-eesdr.com

Full description of ERS is presented in the User Manual, section 14.

Key Benefits:

  • Eliminates Geographic Barriers: Operate a high-performance station from a location with ideal radio conditions (low noise, excellent propagation) directly from your computer, anywhere in the world.
  • Enables New Operating Scenarios: Perfect for DX-peditions, contests, extended portable operations, or maintaining your station access while traveling.
  • Simplifies Station Deployment: Ideal for users who cannot install a full station at their primary residence but have access to a remote site (e.g., a country house).

Designed For:

  • Radio amateurs seeking the highest receive signal quality from low-noise areas.
  • Operators unable to deploy a full station in an urban environment.
  • Enthusiasts who frequently travel but wish to stay active in the hobby.
  • Those who want to evaluate transceiver operation and remote capabilities before purchasing hardware.

Ecosystem Components:

  • ExpertCloud: A personalized cloud service for centralized account management, device discovery, and secure connection establishment.
  • ExpertStarter: A compact hardware/software unit installed at the remote shack, acting as a connectivity bridge.
  • Dual User Interface Options: A Web-based Interface for quick access via a browser + The full-featured ExpertSDR3 application for professional operation.

Visit ExpertCloud

Expert Remote System (ERS) reviewed by Werner Schnorrenberg (DC4KU) (July 2022)
English version / German version
Published in Funkamateur


Output voltage spikes investigation, by Ivan De Cesaris IZ0JNY/HB9ETO (December 2021)


Review published in CQ DL 1/2022 and 2/2022, by Werner Schnorrenberg (DC4KU) (November 2021)
German version / English version


eHam.net review page


AAT-100 tuner review in Radioamater, by Pavel Misek (OK7PM) (April 2021)
In Czech


Review of the SunSDR2 PRO and SunSDR2 DX by Graziano Roccon (IW2NOY) (March 2020)


Review in Radioamater, by Pavel Misek, OK7PM (January/February 2020)
Part 1 / Part 2
In Czech


ExpertRemote system reviewed by Werner Schnorrenberg (DC4KU) (November 2019)
Published in Funkamateur 3-2020

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Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.

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Standard Parcels

Royal Mail Return Label

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Per parcel

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Larger Parcels

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Warranty Terms & Conditions

New Equipment Warranty

Minimum 2-Year Warranty

All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.

Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.

Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.

Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.

All warranties are provided in addition to your statutory consumer rights against ML&S, which are not limited by the warranty period.

International Returns & Warranty

Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.

International customers are responsible for return postage unless the goods are faulty and ML&S has been notified within a reasonable time.

ML&S accepts no responsibility for additional charges resulting from incorrectly completed customs documentation. Any additional duties charged to ML&S as a result will be billed to the customer before return of the goods.

Need Help With a Return?

Our team can assist with returns, postage arrangements, modifications and warranty claims.

Nothing in these terms excludes or limits your statutory consumer rights.