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
  • ExpertRemote system provides full remote control of the transceiver
  • An opportunity to use the transceiver in the SO2V mode
  • Full or half-duplex mode*
  • 2 software receivers + SubRX for each of them (4 slices total) + independent wideband Bandscope up to 80 MHz
  • Antenna switch with 2 HF antenna connectors and separate VHF antenna connector
  • Supports use of VHF transverters
  • An opportunity to use the transceiver as a signal generator via DAC OUT connector
  • Built-in power-meter and SWR-meter for HF bands
  • ExtCTRL connector to control external devices with 8 powerful keys with open collector
  • Ethernet LAN interface provides fast and reliable connection to PC
  • ALC connector for external power amplifiers**
  • TCI interface for seamless connection with third-party software like SDC (with its own Skimmer), LogHX, SWISSLOG and RUMlog, more are coming
  • Professional TX processing module provides the most advanced tuning capability for voice operation
  • Small delay in CW mode (about 10 ms)

* Full-duplex mode is supported by the transceiver's hardware but is not implemented in the firmware and software yet. This mode will be implemented in future versions of ExpertSDR2 software.

** ALC functionality is supported by the transceiver's hardware but is not implemented in the ExpertSDR2 software. It will be supported in the ExpertSDR2 1.3 software release.


PC requirements

  • CPU Intel Core i3 1.6 GHz and higher
  • Video card, minimum resolution 1024x600, 128 MB, OpenGL 1.5 support and higher
  • Local network connector 100 Mbps or 1 Gbps
  • The ExpertSDR2 works with Windows 7-10, OS Linux Ubuntu x64 and macOS 10.12 and newer


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.)


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 - 11.07.2018


User Manual Addendum version 5, by Erik EI4KF

September 2018

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.


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.


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


installer ExpertSDR2 v.1.2.0_SunSDR2_PRO

installer ExpertSDR2 x64 v.1.2.0_SunSDR2_PRO
Firmware v. 41.8 dd: 02-11-2016
Published on 27-04-2018


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 (created by Ubuntu 16.04)

installer ExpertSDR2 v.1.2.0

Firmware v. 41.8 dd:02-11-16
Published on 27-04-2018


mac oc x macOS

installer ExpertSDR2 v.1.2.0

Firmware v. 41.8 dd:02-11-16
Published on 20-04-2018


ExpertSDR2 works on macOS 10.12 Sierra (earlier versions weren't tested).