Small receiver

      for great experts



Small-size ColibriDDC receiver is intended to receive the signals in HF frequency band 0.09 to 55 MHz, and also with the help of external filters to receive frequencies up to 800 MHz and work together with PC. It was designed in accordance with the principle of direct digital signal sampling by high-speed analog-digital converter. Such architecture allows to get rid of additional noise of analog cascades and makes the air sound natural and transparent. Local network interface allows to use the device remotely and also allows to connect simultaneously several receivers to one PC for solving various signal receipt tasks. ColibriDDC is a good low-cost receiver to review the technology of direct sampling which can be used in different spheres.

Note! The receiver doesn't contain band pass filters and can be overloaded by the strong signals from air.

Main capabilities 

  • ADC with sampling frequency 125 MHz and 14-bit resolution is used
  • Two independent receiving channels with sampling frequencies up to 312 kHz
  • Record air stations with the bandwidth to 312 kHz and the opportunity to reproduce it later
  • Opportunity to receive in Nyquist zones up to 800 MHz (necessary to set additional external filters)
  • Wide spectrum scope up to 62,5 MHz
  • 24 bit audio – DAC for decreasing signal delay
  • Connector for controlling external devices, 7 programmable transistor switches
  • Interface with PC – local network 100 Mbps
  • Low power consumption, 5V 0.64A
  • External reference generator input 10 MHz
  • Small dimensions W 64 x H 24 x L 112 mm
  • ExpertSDR2 receiver's software

Application field

  • Dual channel HF receiver
  • Panadapter  to classical transceivers
  • Remote reception point for contests and other applications
  • Spectrum analyzer with wide spectrum scope up to 60 MHz
  • Work with external digital signal decoders (digital type connection programs, CW skimmer, etc.)

PC requirements

  • Processor Intel Core2Duo and higher
  • Video card supporting the technology of OpenGL 1.5 and higher and RAM 256 Mbyte and more
  • Local network connector 100 Mbps or 1 Gbps
  • OS Windows 7-10 x32 or x64, OS Linux Ubuntu x64


ExpertSDR2 program with adapted interface for the receiving mode is used together with the ColibriDDC receiver. At the present moment software works in the receiving mode and maintains two independent channels with the bands to 312 kHz. DSP library, developed by the company Expert Electronics, allowed to improve the receipt quality and to higher the software reliability. Two OS are supported: Windows 8 and Linux Ubuntu.

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 2A
  • Adapter SMA - PL259 (UHF)
  • LAN – cable

BPF-KIT configuration: 

  • ColibriDDC Receiver
  • Power source 5V 2A
  • Adapter SMA - PL259 (UHF)
  • LAN – cable

Additional configuration:

In addition to basic receiver's configuration can be purchased the following devices:

  • PC's headset EE-PH-01
  • Control panel EE-EP-01 or Constructor EE-EP-02 for comfortable remote work


Receiving bandwidth, MHz 0.01 - 55 (0.01-62.5)
Receiving bandwidth in all Nyquist zones, MHz 0.01– 800
Spectrum scope bandwidth (up to), MHz 62.5
Amount of independent receiving channels 2
Sensitivity, uV 0.3
Blocking Dynamic Range (BDR), dB 110
IMD3 Dynamic Range, dB 90
Image channel suppression, dB >110
Supply voltage range, V 4.5...5.5
Maximum consumption current, A 0.64
RF ADC clock frequency, MHz 125
RF ADC resolution, bit 14
Local oscillator stability, ppm +/- 0.5
Built-in attenuator, dB 0, -20
Built-in audio DAC resolution, bit 24
Dimensions W x H x L, mm 64x24x112
Weight, kg 0.3


* 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.


Optional BPF-kit board with HF octave band filters:

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 should be installed inside the receiver's case, with a set of simple manipulations.



pdf Terms of the product's warranty

pdf User Manual for the ColibriDDC receiver v 1.2

This manual is good for either new or experienced users, it describes the hardware of the receiver and explains how to operate it with the ExpertSDR2 software 24.11.2017.

pdf Connecting the ColibriDDC to the CW SkimmerServer

An instruction for the CW SkimmerServer 16/01/2017

pdf Operating the ColibriDDC receiver with a third party software (HDSDR, SDR#)

An instruction for the ExtIO library 16/01/2017

pdf ExpertSDR2 and CW Skimmer

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



"Warning!" Before the installation of the latest version of the ExpertSDR2, please uninstall the previous version completely with "Programs Add/Delete".


installer ExpertSDR2 v.1.2.0_ColibriDDC

installer ExpertSDR2 x64 v.1.2.0_ColibriDDC

Published on 27-04-2018


installer ExpertSDR2 v.1.1.3_ColibriDDC


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 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_4_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:



Library for work with CW SkimmerServer software

zip iconColibriDDC_SkimSrv  


Library ExtIO for work with the third party software

zip iconExtIO_ColibriDDC

  Linux x64 (created by Ubuntu 16.04)

installer ExpertSDR2 v.1.2.0

Published on 27-04-2018


mac oc x macOS

installer ExpertSDR2 v.1.2.0

Published on 20-04-2018



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

Articles and Reviews

pdf ColibriDDC receiver review (, October 2015)  

ColibriDDC receiver review  in by Andrew Barron ZL3DW 

pdf ColibriDDC receiver article (FUNKAMATEUR, September 2015)

Article in German magazine FUNKAMATEUR about ColibriDDC receiver

pdf Review of ColibriDDC receiver (RadioUser, July 2015)

Mike Richards review of the Expert Electronics ColibriDDC published in the July 2015 issue of RadioUser. Supplied courtesy of PW Publishing Ltd., which retains the copyright.

Review of ColibriDDC receiver by Fernando Duarte (, May 2015)

Review of ColibriDDC receiver by Fernando Duarte