Transceiver with direct digitization

and direct signal synthesis


The SunSDR2 PRO transceiver was designed for advanced operation on HF and VHF bands, even the most demanding operator will be surprised by its capabilities. Modern hardware along with the ExpertSDR2 software makes this high-performance SDR transceiver the perfect base station and at the same time perfectly suitable for field operations.

Main capabilities

  • Independent RX path based on DDC (Direct Down-Conversion) architecture
  • Independent TX path based on DUC (Direct Up-Conversion) architecture
  • 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 like SDC (with its own Skimmer), LogHXSWISSLOG and RUMlog, more are coming
  • 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)
  • Small delay in CW mode (about 10 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 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 descriptionBlock Diagram SunSDR2 PRO

Transceiver SunSDR2 PRO configuration

  • Transceiver SunSDR2 PRO
  • 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:


The main improvements in SunSDR2 PRO in comparison to SunSDR2

  1. High-speed ADC LTC2209 instead of LTM9001CV-BA, as a result, the transceiver has a higher dynamic range - 129...130 dB instead of 118-120 dB in SunSDR2. It allows you to work with enabled preamp +10 dB alongside strong АМ stations within the octave filters bandwidth, which is very important for 20M, 17M, 15M, with low air noise level and good propagation. The receiver is almost impossible to overload.
  2. LPFs in the power amplifier was increased to 5th order, instead of 3rd.
  3. Improved antenna switch, idle connectors shorted on the case. It eliminates crosstalk from HF antennas while working on the VHF band and vice versa.
  4. BNC antenna connectors were replaced with more reliable mini-UHF.
  5. Improved HF crosstalk protection on all connectors: PTT, CW, MIC.
  6. Added diode protection to ExtCTRL keys. Voltage output +12...+15 V now goes via 1 А fuse and polarity reversal protection on the ExtCTRL connector instead of 5 V.
  7. Improved heatsink - it is a single detail instead of multilayer construction as before.
  8. Improved PCB board - transistors and VHF path are placed in the PCB space with the shortest outputs. Improved PCB structure, added layers from 4 to 6.
  9. And a lot of other small improvements.

SunSDR2 PRO transceiver is optimized for mass production with improvements, which were implemented after 5 years of manufacturing and extensive usage of the SunSDR2.



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...146
Sensitivity, uV 0,07
Max output power in HF, W 20
Max output power in VHF, W 8
Blocking Dynamic Range in HF mode (BDR), dB 130

Blocking Dynamic Range in VHF mode (BDR), dB

Dynamic Range over IMD3 (2 kHz), dB >100
Reciprocal Mixing Dynamic Range (2 kHz), dB >110
RF type of ADC LTC2209, Linear Technology
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
Local oscillator's stability, ppm +/- 0.5
Supply voltage range, V 12...16
Current consumption RX/TX, А 1.25/5
Built-in audio codec resolution, bit 24
ALC input voltage range, V 0..4
Operating temperature, ºC 0...+75
Dimensions, mm 165х165х35
Weight, kg 1,5

* 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 Terms of the product's warranty

pdf SunSDR2 PRO Getting Started
This document describes first steps with the SunSDR2 PRO transceiver.

pdf "Setting up SunSDR2 PRO for DUMMIES" by Pete Parisetti, MM0TWX

pdf User Manual v1.5
The new version of the User Manual for the SunSDR2 PRO transceiver - 20.11.2018

User Manual Addendum version 5.3, by Erik EI4KF
January 2019

Setup instructions for WSJT-X, ExpertSDR2 and MacLoggerDX

pdf Betriebsanleitung V1.2 (User Manual in German)
User Manual for SunSDR2 PRO transceiver in German 12-02-18

pdf 中文软件操作手册 V1.4 (User Manual in Chinese)
User Manual for SunSDR2 PRO transceiver in Chinese 03-05-18

pdf ExpertSDR2 and CW Skimmer
This guide describes how to setup ExpertSDR2 for use with one or two CW Skimmers.

pdf How to set the WLAN module to the Client mode

Useful diagrams

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 transceiver.

pdf Connecting an external PA, fan, relay etc. to the SunSD2 PRO
In this document, you can find information about how to connect the SunSDR2 PRO 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.1.3.0 Beta1_SunSDR2_PRO
installer ExpertSDR2 x64 v.1.3.0 Beta1_SunSDR2_PRO
Firmware v. 43 dd: February 2019
Published on 25-04-2019
pdf ExpertSDR2 1.3.0 Beta1_Release_Notes
pdf ExpertSDR2 1.3.0 Alpha2_Release_Notes
pdf ExpertSDR2 1.3.0 Alpha1_Release_Notes


installer ExpertSDR2 v.1.2.0_SunSDR2_PRO

installer ExpertSDR2 x64 v.1.2.0_SunSDR2_PRO
Firmware v. 43 dd: February 2019
Published on 15-02-2019

installer ExpertSDR2 v.1.1.3_SunSDR2_PRO

pdf ExpertSDR2 1.2.0 final_Release_Notes
pdf ExpertSDR2 1.2 RC7_Release_Notes
pdf ExpertSDR2 1.2 RC6_Release_Notes
pdf ExpertSDR2 1.2 RC5_Release_Notes
pdf ExpertSDR2 1.2 RC4_Release_Notes
pdf ExpertSDR2 1.2 RC3_Release_Notes
pdf ExpertSDR2 1.2 RC2_Release_Notes
pdf ExpertSDR2 1.2 RC_Release_Notes
pdf ExpertSDR2 1.2 beta_6_Release_Notes
pdf ExpertSDR2 1.2 beta_5_Release_Notes
pdf ExpertSDR2 1.2 beta_4_Release_Notes
pdf ExpertSDR2 1.2 beta_3_Release_Notes
pdf ExpertSDR2 1.2 beta_2_Release_Notes
pdf ExpertSDR2 1.2 beta_1_Release_Notes
pdf ExpertSDR2 1.2 alpha_5_Release_Notes
pdf ExpertSDR2 1.2 alpha_4_Release_Notes
pdf ExpertSDR2 1.2 alpha_3_Release_Notes
pdf ExpertSDR2 1.2 alpha_2_Release_Notes
pdf ExpertSDR2 1.2 alpha_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.1.3.0 Beta1
Firmware v. 43 dd: February 2019
Published on 25-04-2019


installer ExpertSDR2 v.1.2.0
Firmware v. 43 dd: February 2019
Published on 15-02-2019

ExpertSDR2 tested on Ubuntu 18.04 x64.

mac oc x macOS

installer ExpertSDR2 v.1.3.0 Beta1
Firmware v. 43 dd: February 2019
Published on 25-04-2019


installer ExpertSDR2 v.1.2.0
Firmware v. 43 dd: February 2019
Published on 15-02-2019

ExpertSDR2 works on macOS Mojave.