SunSDR2 transceiver - is an up-to-date system of the amateur radio communication in the HF and VHF frequency bands with the digital signal processing. This device is designed to work with the PC via Ethernet (LAN) or via WiFi. Receive path is based on the direct conversion principle, transmission path – over the direct synthesis principle. 

Main capabilities 

  • Separate independent receive path based on Direct Down Conversion principle (DDC)
  • Separate independent transmitter, based on the Direct Up-Conversion principle (DUC)
  • Antenna switch for 2 antennas in HF
  • Built-in power-meter and SWR-meter in HF band
  • External control connector for other devices, 10 powerful keys with open collector
  • ALC connector for external power amplifiers*
  • Input connector for connecting PTT footswitch
  • Input connector for connecting CW-key
  • Output Jack for headphones, impedance 8-10000 Ohm
  • Microphone input Jack for electret microphone
  • Microphone connector with PTT switch Yaesu MH-31, which contains microphone, PTT button, and 3 additional functional buttons
  • Protection from polarity reversal
  • Ethernet LAN interface provides galvanic isolation between transceiver and PC
  • Transceiver's calibrations are kept inside the device. No need for primary calibration
  • The possibility of remote work. PTT footswitch and CW-key are connected to the E-Coder panel, microphone – to the PC

ALC functionality is supported by the transceiver's hardware but is not implemented in the ExpertSDR2 software. It will be supported in the future ExpertSDR2 software releases.

Application field

  • Radio Amateur HF/VHF transceiver
  • Remote reception point for contests
  • SO2R/SO2V working contest-station
  • Spectrum analyzer with the spectrum scope up to 80MHz
  • Record air stations with the further reproducing


Block diagram

SunSDR2 blockdiag en

Transceiver SunSDR2 configuration

The transceiver can have additional option WiFi unit for work in wireless networks. In accordance with it at the rear panel can be either set or not WA connectors and the delivery set is changed.

Basic configuration:

  • Transceiver SunSDR2. At the rear panel of the basic model, there is no SMA connector for WiFi antenna
  • LAN-cable for connecting to local network
  • Power cable for connecting the transceiver to power supply
  • Two audio-adapters  JACK 6.3mm to JACK 3.5mm for connecting PC's headset to transceiver

Maximum configuration:

  • Transceiver SunSDR2. At the rear panel of the model is set SMA connector for WiFi antenna
  • LAN-cable for connecting to local network
  • Small-size WiFi antenna
  • Power cable for connecting the transceiver to power supply
  • Two audio-adapters  JACK 6.3mm to JACK 3.5mm for connecting PC's headset to transceiver

Additional configuration:

In addition to the basic transceiver's configuration can be purchased the following devices:

  • Switched power supply  for voltage 15 V current 5A
  • PC's headset  with electret microphone
  • SDR control panel E-Coder or E-Coder Mini kit for remote comfortable work


General coverage receiver in HF, MHz 0.09...65
General coverage receiver in VHF, MHz 95...148
Frequency coverage in HF in TX mode, MHz All amateur frequencies
Frequency coverage in VHF in TX mode, MHz 144...148
Sensitivity, uV 0.2
Maximum transmitter's output power in HF, W 20
Maximum transmitter's output power in VHF, W 8
Blocking dynamic range in HF mode (BDR), dB 120
Blocking dynamic range in VHF mode (BDR), dB >114
RF ADC clock frequency, MHz 160
RF ADC resolution, bit 16
RF DAC clock frequency, MHz 640
RF DAC resolution, bit 14
Recommended power supply, V 15
Supply voltage range, V 12...16
Local oscillator's stability, ppm +/- 0.5
Maximum consumption current, А 5
Built-in audio codec resolution, bit 24
ALC input voltage range, V 0..4
Dimensions, mm 165х165х35
Operating temperature, Celsius degree 0...+50
Weight, kg 1


* More modes can be supported via external software

Specifications are subject to change without notice or obligation and specifications are only guaranteed within the amateur radio bands.


pdf ExpertSDR2 User Manual v1.4 24.11.2017
pdf Betriebsanleitung v1.3 (User Manual in German) 01-10-19
pdf 中文软件操作手册 V1.4 (User Manual in Chinese) 03-05-18
pdf MANUAL DE USUARIO v1.5 (User Manual in Spanish) 11-09-19

pdf User Manual Addendum, by Erik EI4KF

pdf Adenda del Manual del Usuario version 6.9 08-07-20

Setup instructions for WSJT-X, ExpertSDR2 and MacLoggerDX

pdf 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


Useful schemes

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 transceiver.

 pdf Connecting to SunSDR2 of external PA, fan and relay

In the document, you can find information about how to connect to external PA. Described the connection to transceiver a fan and relay to control the external BPF, antenna switch, etc.

pdf The schematic diagram for connection VL-1000(Yaesu) and SunSDR2

This schematic diagram provides you to create a special control cable by your own hands. With this cable, you can connect the SunSDR2 transceiver to the VL-1000 power amplifier from Yaesu and control bands switching and PTT mode.
Also, you can use this schematic diagram for building additional cables for control PA, antenna switches etc.

pdf ExtCtrl to EB300 connection diagram


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
installer ExpertSDR2 x64 v.1.3.1 Update11_SunSDR2

Firmware v. 72 dd: Fall 2021
Published on 13-10-2021
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 2019 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 works on macOS Big Sur. ExpertSDR2 crashes during the closing, but it doesn't affect software operation at all.

Articles and Reviews

pdf Article in FUNKAMATEUR (August 2014)

The article in German magazine FUNKAMATEUR about SunSDR2 transceiver (German language)