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


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
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.


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 Update9_SunSDR2 QRP
installer ExpertSDR2 x64 v.1.3.1 Update9_SunSDR2 QRP
Firmware v. 8.0 dd: Summer 2021
Published on 30-06-2021
pdf ExpertSDR2 1.3.1_Release_Notes
ExpertSDR2 1.3.1_Update 9_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 Update9
Published on 30-06-2021

ExpertSDR2 tested on Ubuntu 20.04 x64.

mac oc x macOS

installer ExpertSDR2 v.1.3.1 Update8
Published on 22-12-2020

ExpertSDR2 works on macOS Big Sur. ExpertSDR2 crashes during the closing, but it doesn't affect software operation at all.

Articles and Reviews

Expert Remote System (ERS) reviewed by Werner Schnorrenberg (DC4KU) (July 2022)
English version / German version
Published in Funkamateur

Article by Marc Schijven, PE1FJN (October 2019)

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