Expert Electronics SunSDR2-DX - HF/6M/VHF Transceiver
SKU Part Number: SUNSDR2-DX
The SunSDR2 DX transceiver is based on the well-known SunSDR2 PRO model with various hardware improvements. It is very compact for a 100W format,...
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Special Price £1,999.00 £1,665.83 Regular Price £2,299.99
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The SunSDR2 DX transceiver is based on the well-known SunSDR2 PRO model with various hardware improvements. It is very compact for a 100W format, has active cooling, and an improved supply system, meaning it’s perfectly suited for DXpeditions. Also, it has a separate connector for an external ATU, thus SunSDR2 DX has all the functionality you got used to in our radios and even more. Improved hardware along with the ExpertSDR2/3 software makes this high-performance SDR transceiver the perfect base station. The obvious choice for any radio amateur!

Hardware improvements of Gen5 (late 2022) in comparison to Gen1 (November 2019):

  • Redesigned heatsink, with thinner and more frequent gills for higher effectiveness
  • Improved temperature sensor placement for more accurate temperature readings
  • Improved TX IMD3 up to ~37 dB across all HF bands, with 100W output power
  • 6M output power have been increased up to 80W
  • Improved SDR PCB protection from cross-talks. Improved 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
  • Slight improvement of the RX path
  • TX filter of the DAC chip, which provides better linearity of the TX signal
  • Band pass filter on the PA input, which improves linearity of PA operation
  • Improved structure of 160, 6M TX filters
  • RX/TX switching node on PCB is more resilient now


Hardware improvements in comparison to SunSDR2 PRO:

  • 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)
  • Improved supply system, which leads to less heating and less power consumption
  • Active cooling
  • Antenna switch supports Predistortion without external devices
  • Improved topology of SDR PCB


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 is not implemented in the ExpertSDR2 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.)
  • RF Cable Mini UHF — HF PL259 1Ft (0.3m 1 pc.)


Additional accessories:

  • E-Coder Plus or E-Coder control panel for comfortable tuning


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 24
RF input/output 2HF, 1VHF (Mini_UHF)
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.

pdf  Terms of the product's warranty

pdf  SunSDR2 PRO Getting Started
pdf  Empezando (Getting Started in Spanish) 

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

pdf  User Manual v.1.3.2 06-07-22
pdf  Manual de Usuario v1.3.2 22-09-20

ATU connector pin-out

pdf  User Manual Addendum, by Erik EI4KF

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

Setup instructions for WSJT-X, ExpertSDR2, and MacLoggerDX


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  Connecting an external PA, fan, relay, etc. to the SunSD2 PRO/DX
In this document, you can find information about how to connect the SunSDR2 PRO/DX to an external PA, fan, or relay to control the external BPF, antenna switch, etc.

pdf  Control cable schematic for external PA VL-1000 (Yaesu)
This schematic allows you to assemble your own control cable for PA VL-1000 by Yaesu. With this cable, you control PA's bands and RX/TX mode. This cable might be used for control of other devices, which works with 4-contact control protocol by Yaesu, i.e. PAs, antenna switches, etc.

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!


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

To use the ExpertSDR2 software, please install the Visual Studio Redistributable 2017 either from the ExpertSDR2 installer or from the official Microsoft website:


 Linux x64

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

ExpertSDR2 tested on Ubuntu 20.04 x64.

mac oc x  macOS

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

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


We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.


If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]