A compact ColibriDDC receiver was designed to work on HF band 0.09 to 60 MHz, for better performance you can add the internal BPF-module (160-10M bands). With the help of external filters, ColibriDDC can effectively operate on frequencies up to 800 MHz. LAN interface allows you to use the receiver remotely via LAN cable and to connect several receivers to one PC at the same time, for various projects. Also, you can hook up the receiver with the RaspberryPi3 (with installed ExpertRS software) and use it from any place on the Planet, you just have to have a reliable internet connection.

Note! The basic version of the receiver doesn't include the BPF-module.


Main features and capabilities of the receiver

  • RX path based on DDC (Direct Down-Conversion) architecture

  • ExpertRemote system provides full remote control of the receiver

  • 2 software receivers (each up to 312 kHz) + SubRX for each of them (4 slices total) + independent wideband Bandscope up to 62.5 MHz

  • ExtCTRL connector to control external devices with 7 powerful keys with open collector

  • 100 Mbps Ethernet LAN interface provides a fast and reliable connection to PC

  • TCI interface for seamless connection with third-party software, the list of software with TCI support

  • Record IQ channel with the bandwidth up to 312 kHz

  • Receiving in undersampling mode up to 800 MHz (requires external BPF)

  • High-quality 24-bit audio–DAC installed for the smallest signal delays

  • Low power consumption, 5V 0.64A

  • External reference generator input 10 MHz

  • Small size W 65 x H 26 x L 125 mm


Receiver's block diagram

  • REF – connector to connect external 10 MHz generator
  • PLL – ADC clock frequency synthesizer
  • ATT – attenuator
  • MCU – microcontroller unit
  • Ant – connector to connect the HF band antenna
  • TCXO – inbuilt temperature compensated crystal oscillator
  • ADC – high-speed analog-digital converter
  • DAC – audio digital-analog converter
  • EXT CTRL - connector for controlling the external devices
  • LPF – input low-frequency filter (disabling)
  • FPGA - field programmable gate array
  • LAN – local network connector
  • PHONES – jack for connecting headphones
  • Front – front panel
  • Rear – rear panel


Basic configuration: 

  • ColibriDDC Receiver
  • Power source 5V 1A
  • Adapter SMA - PL259 (UHF)
  • LAN – cable

Additional accessories:


RF ADC, bit @ MHz 14 @ 125
ADC type ADS4145
RX Frequency range, MHz 0.1...55
RX in Nyiquist zones, MHz up to 800
Independent software receivers 2 + 2 SubRX
Sample rate, kHz @ bit 39; 78; 156; 312 @ 24
Bandscope, MHz 62
Switchable LPF, MHz 55
Optional BPF kit 8 x BPF, ATT - 20dB, Preamp +10dB
BDR on HF, dB 108
BDR on VHF, dB 96
Sensitivity (SNR +10dB), uV 0.41
DR IMD3, not less dB 90
RMDR, dB n/s
ATT/Preamp, dB -20; 0
Local oscillator TCXO, MHz +/- ppm 16 +/- 2.5
External 10 MHz oscillator input +
Built-in audio codec, bit 24
RF input/output 1 (SMA)
PC interface LAN 100 Mbit
DC voltage range, V 5.0...6.0
Recommended DC voltage, V 5.5
Current consumption, A 0.64
Power consumption, W 3.5
Operating temperature, °C/°F 0...+50/ +32...+122
Dimensions L x W x H, cm/inches 12.5 x 6.5 x 2.6/ 4.41 x 2.52 x 0.94
Weight, kg/lbs 0.16/ 0.66


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


Optional BPF-kit board with HF octave band filters. BPF-kit could be installed inside the receiver's case, with a set of simple manipulation.

160M: 1.73-2.6 MHz
80M: 2.6-4.3 MHz
60M: 4.3-6.5 MHz
40M: 6.5-7.9 MHz
30M: 7.9-13 MHz
20M: 13-15.9 MHz
17-15M: 15.9-21.0 MHz
12-10M: 21.0-30 MHz
ATT -20 dB
Preamp +10 dB

BPF-kit works either with RX1 or when RX1 and RX2 are on the same band. If RX1 and RX2 are on different bands, then ColibriDDC uses LPF. It's explained by the fact that RX1 and RX2 are software, not physical receivers.



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_ColibriDDC
installer ExpertSDR2 x64 v.1.3.1 Update11_ColibriDDC
Firmware v. 12 – May 2022
Published on 19-05-2022
pdf ExpertSDR2 1.3.1_Release_Notes
pdf ExpertSDR2 1.3.1_Update 8_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:

zip icon ColibriDDC Skimmer Server


Library ExtIO for work with the third party software

zip iconExtIO_ColibriDDC

  Linux x64

installerExpertSDR2 v.1.3.1 Update11
Published on 19-05-2022

ExpertSDR2 tested on Ubuntu 20.04 x64

mac oc x macOS

installer ExpertSDR2 v.1.3.1 Update11
Published on 19-05-2022

ExpertSDR2 was tested on the current macOS version. ExpertSDR2 crashes during the closing, but it doesn't affect overall software operation.


Welcome to the new generation of SDR software – ExpertSDR3!

In 2021, we turned a new page in our history by launching the ExpertSDR3.

ExpertSDR3 software is being tested on the latest versions of Windows 10, Linux Ubuntu 22.04, and macOS 12 (with Intel CPU).
To report software bugs, please use this page.

ExpertSDR3 1.0.7 Beta, FW 86.8

Download Windows Download Linux Download macOS

ExpertSDR3 minimal system requirements:

  • ОS Windows 10 x64 or later versions, Linux Ubuntu 22.04 x64 and the latest patches of versions 11 (BigSur)/ 12 (Monterey)/ 13 (Ventura) of macOS (Intel and Silicon)
  • 4 core CPU Intel Core i3 or Core i5
  • 8 GB RAM
  • Video card with support of DirectX11 or higher

Expert Remote System (ERS)

Server (Starter) for Expert Remote System, build 20221028

Download Windows Download Linux

Download ARM64 linux

Download ARM64 RPi



Release notes

Release Notes for alpha/beta versions of the ExpertSDR3 (link to a Google Drive folder)
Notas de la versión beta 1_0_0 de ExpertSDR3

  • Added a module where you can select third-party software to be launched along with the ExpertSDR3
  • Implemented Scalable waterfall
  • Now you can control waterfall speed
  • For ColibriNANO implemented auto-preamp
  • For ColibriNANO implemented “ADC overload” indication
  • Implemented ExpertSync module, the server is a part of the ExpertSDR3 Device Manager, and clients are in every ExpertSDR3 client instance. It allows you to sync tuning frequencies, modes, filter BW and RIT among all EE devices
  • You can assign overall volume and monitoring volume to E-Coder knobs 
  • Fixed bugs from the previous alpha
  • E-Coder panel support
  • ExpertRemote system for RX mode
  • TX modulator settings
  • PTT function
  • Break-In function for each software RX
  • Firmware update capability
  • New TCI 1.5 (specification)
  • Fixed numerous bugs from the previous alpha
  • Memory panel operation was improved (CTCSS / repeater settings are stored in memory, now you can apply them for each receiver)
  • Improved Band Manager (added: PA key control, set max output power for per band, and adjust additional preamp/ATT coefficient for external preamp/ATT)

Articles and Reviews

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