Direct sampling HF and 6M transceiver


The SunSDR2 QRP is the HF and 6M transceiver with 5W output power and a wide range of capabilities. Thanks to the constantly improving ExpertSDR2 software and advantages of the direct sampling the SunSDR2 QRP can solve any given task for a reasonable price. The SunSDR2 QRP can be used either locally via the LAN interface or remotely using the Expert Remote system, it gives you flexibility in arranging your working place as never before.

Main features

  • Immense functionality for a reasonable price
    Designing each our device, we try to reach the best balance between the price and functionality
  • Full support of the ExpertSDR2 software
    Continuously growing and improving ExpertSDR2 software is 100% compatible with the SunSDR2 QRP and will continue to support it for many years to come, for free!
  • External control connector
    Connect up to 8 external devices to 8 powerful keys with open collectors, such as PAs, external filters, rotate antenna devices etc.
  • 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 
    Use it for seamless connection with third-party software, the list of software with TCI support
  • No need for an external soundcard
    The SunSDR2 QRP does not require an external sound card and audio cables, just plug your headphones in the transceiver and listen to the air
  • 16-bit ADC at 122.88 MHz
    The SunSDR2 QRP has the best ADC in its price range which provides 122 dB BDR
  • Sample rates: 48-384 kHz
    At the same time, you can use a 60 MHz wide bandscope + 2 software RXs, each has a SubRX
  • Special mode for 768 kHz or 960 kHz sample rate, only for 1 RX + bandscope at the same time
  • Supports 4M band only for RX in the 2nd Nyquist zone


Application field

  • HAM amateur HF transceiver
  • Remote operation just for fun and for contests
  • Spectrum analyzer with the wide bandscope up to 60MHz
  • Record IQ files and listen to them afterward


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

Block Diagram SunSDR2 QRP

 Basic configuration:

  • SunSDR2 QRP transceiver
  • LAN-cable (1.8m)
  • Power supply cable
  • RF Cable Mini UHF — HF (PL259) 1Ft (0.3m 1 pc.)

Additional accessories:


RF ADC, bit @ MHz 16 @ 122.88
ADC type LTC2165
RX Frequency range, MHz 0.1...55; 70...70.5
Undersampling, MHz 0.1...500
Independent software receivers 2 + 2 SubRX
Sample rate, kHz @ bit 48; 96; 192; 384 @ 24
768; 960 @ 16 (only RX1)
Bandscope, MHz 61
RX HF filters, MHz LPF: 58 + 8 x BPF
RX VHF filters, MHz HPF: 68 + BPF for 4M
BDR on HF, dB 122
Sensitivity, uV 0.1
DR IMD3, not less dB 100
RMDR, dB 107
ATT/Preamp, dB -20; -10; 0; +10
RF DAC, bit @ MHz 14 @ 122.88
TX Frequency range, M All amateur bands 160-6
Output power on HF, W 5 (up to 8)
Output power on 6M, W 5
TX IMD3, dB 30
Local oscillator TCXO, MHz +/- ppm 16 +/- 2.5
External 10 MHz oscillator input +
Built-in audio codec, bit 24
RF input/output 1 (Mini-UHF)
PC interface LAN 100 Mbit
DC voltage range in RX/TX, V 8...15 / 10...15
Recommended DC voltage, V 12
Current consumption RX/TX, A 0.3 / 3
Power consumption RX/TX, W 3.6 / 36
Operating temperature, °C/°F 0...+50/ +32...+122
Dimensions L x W x H, cm/inches 18.5 x 10.6 x 4.5/ 6.5 x 3.94 x 1.38
Weight, kg/lbs 0.8/ 1.8

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 ExpertSDR2 User Manual v1.1
The new version of the User Manual for the SunSDR2 QRP transceiver - 20.11.2018

User Manual Addendum, by Erik EI4KF
pdf Adenda del Manual del Usuario version 6.9 08-07-20

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 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 QRP transceiver.

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)

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 QRP
installer ExpertSDR2 x64 v.1.3.1 Update6_SunSDR2 QRP
Firmware v. 7.0 dd: Summer 2020
Published on 21-07-2020
pdf ExpertSDR2 1.3.1_Release_Notes
pdf ExpertSDR2 1.3.1_Update 6_Release_Notes


installer ExpertSDR2 v.1.2.0_SunSDR2 QRP
installer ExpertSDR2 x64 v.1.2.0_SunSDR2 QRP
Firmware v. 6.0 dd: 09-06-2018
Published on 09-06-2018
pdf ExpertSDR2 1.2.0_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


installer ExpertSDR2 v.1.2.0
Firmware v. 6.0 dd: 09-06-2018
Published on 09-06-2018

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

Article by Marc Schijven, PE1FJN (October 2019)

ExpertRemote system reviewed by Werner Schnorrenberg (DC4KU) (November 2019)
Published in Funkamateur 3-2020