HF 100 W, 6М 50 W, VHF 8 W

Transceiver with direct digitization

and direct signal synthesis


The SunSDR2 DX transceiver based on the well-known SunSDR2 PRO transceiver with several hardware improvements. It is a 100W-HF; 50W-6M; 8W-2M transceiver, very compact, has active cooling and improved supply system, meaning it’s perfectly suited for DXpeditions. Also, we've added 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 software makes this high-performance SDR transceiver the perfect base station. The evident choice for a true contester!

Hardware improvements in comparison to SunSDR2 PRO:

  • Improved supply system, which leads to less heating and less power consumption
  • 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
  • Sturdy DIP-type ExtCtrl connector
  • New connectors: external tuner control, GND
  • Improved PCB topology


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, 50W 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 5-6 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. They will be supported in the future ExpertSDR2 software releases.


The ExpertSDR2 minimal system requirements:

  • 2 or 4 core CPU Intel Core i3 or Core i5;
  • 8 GB RAM;
  • 40 GB free space on the HDD/SSD for the ExpertSDR2 and accompanied programs;
  • 17' or bigger monitor;
  • video card with OpenGL 1.5 or higher;

The ExpertSDR2 software supports Windows 7-10 32/64 bit, Linux (Ubuntu/Kubuntu 18.04 x64), and macOS 10.14 Mojave and higher.


Architecture description

Will be available later


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:



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, not less dB N/A
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 50 (up to 60)
Output power on VHF, W 7 (up to 8)
TX IMD3, dB (tested on 40M band) 10 W - 30
50 W - 30
100 W - 37
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 19.0 x 17.0 x 8.0/ 7.48 x 6.69 x 3.14
Weight, kg/lbs 1.8/ 3.96

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) 11-09-19

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 23-06-20
pdf Manual de Usuario v1.3.2 22-09-20

User Manual Addendum, by Erik EI4KF
pdf Adenda del Manual del Usuario version 6.11 28-09-20

pdf ExpertSDR2 + LogHX + JTDX, by Sergey (RJ7M, ex UA0ZS)
Spanish translation
This document describes how to set up ExpertSDR2 + LogHX + JTDX

Setup instructions for WSJT-X, ExpertSDR2, and MacLoggerDX

pdf ExpertSDR2 and CW Skimmer
This guide describes how to setup ExpertSDR2 for use with one or two CW Skimmers
pdf ExpertSDR2 y CW Skimmer (in Spanish)

Useful diagrams

BAND-data cable wiring for the connection to SPE Expert PAs
ExpertSDR2 settings for BAND-data cable

pdf Using the transceiver for SO2V operation

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

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, e.g. PAs, antenna switches, etc.

pdf ExtCtrl to EB300 connection diagram


Warning! Software for each device is different! Double-check your device before downloading!


installer ExpertSDR2 v.1.3.1 Update6_SunSDR2_DX
installer ExpertSDR2 x64 v.1.3.1 Update6_SunSDR2_DX
SDR firmware v. 57 dd: July 2020
PA firmware v. 12 dd: July 2020
Published on 21-07-2020
pdf ExpertSDR2 1.3.1_Release_Notes
pdf ExpertSDR2 1.3.1_Update 6_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 Update6
Published on 21-07-2020

ExpertSDR2 tested on Ubuntu 20.04 x64.

mac oc x macOS

installer ExpertSDR2 v.1.3.1 Update6
Published on 21-07-2020

ExpertSDR2 works on macOS Mojave.

Articles and Reviews

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

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