Colibri DDC SDR SDR (Software Defined Radio) HF / 6m

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ColibriDDC Receiver:

This small-size receiver is intended to receive signals covering the HF frequency band 0.09MHz to 55MHz, and also (with the help of external filters) to receive frequencies up to 800MHz whilst working together with a PC.

It incorporates direct digital signal sampling by utilising a high speed analogue-digital converter. Such architecture allows the user eliminate additional noise caused by analogue cascades and makes the signal sound more natural and transparent.

The Local Area Network (LAN) interface allows you to use the device remotely and also allows you to connect several receivers to one PC simultaneously.

The ColibriDDC is a great low-cost HF and 6m receiver that makes the absolute most of direct sampling technology.

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 60 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 chanel 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 XP/7/8 x32 or x64, OS Linux Ubuntu x64

Table 1.Technical characteristics:
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, mkV	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	64х24х112
Weight, kg	0.3

VIDEO

Software

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.

REF – connector to connect external 10 MHz generator	PLL – ADC clock frequency synthesizer	ATT – attenuator	MCU – microcontrol 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