Data Communications Solution


The award-winning WiNRADiO WR-G33DDC 'EXCALIBUR Pro' is a high-performance, low-cost, direct-sampling, software-defined, shortwave receiver with a frequency range from 9 kHz to 49.995 MHz. It includes a real-time 50 MHz-wide spectrum analyzer and 4 MHz-wide instantaneous bandwidth available for recording, demodulation and further digital processing. 

This product is an advanced version of the WR-G31DDC receiver, offering many additional features and improvements, such as for example: 

  • 4 MHz instantaneous processing bandwidth
  • Low-noise preamplifier
  • Configurable preselection filters
  • Filter bandwidth adjustable down to 1 Hz
  • 0.5 ppm frequency stability
  • Test and measurement functions
  • Pause function

The receiver's superior performance results from its innovative, direct-sampling, digital down-conversion architecture along with the use of leading-edge components and design concepts. These all result in a very high IP3, wide dynamic range, high sensitivity, and accurate tuning. These key features create a receiver in a class of its own, with wide application potential, at a very affordable price.

The entire 4 MHz DDC (digitally-down-converted) bandwidth is available for recording and demodulation. Three demodulators allow the simultaneous reception of three signal frequencies within the 4 MHz bandwidth.


  • 9 kHz to 49.995 MHz continuous frequency range
  • Direct sampling Digital down-conversion
  • 16-bit 100 MSPS A/D converter
  • 50 MHz-wide, real-time spectrum analyzer
  • 4 MHz recording and processing bandwidth
  • Continuously adjustable filter bandwidth down to 1 Hz
  • Three parallel demodulator channels
  • Pause function
  • Waterfall display functions
  • Audio spectrum analyzer
  • Audio and IF recording and playback
  • Recording with pre-buffering
  • EIBI, HFCC and user frequency databases support
  • Very high IP3 (+31 dBm)
  • Excellent sensitivity (0.20 µV SSB, 0.10 µV CW)
  • Excellent dynamic range (107 dB)
  • Excellent frequency stability (0.5 ppm)
  • Selectable medium wave filter
  • User-configurable preselector
  • Selectable low-noise preamplifier
  • Test and measurement functions
  • USB 2.0 interface

The receiver's robust front-end is equipped with an ultra-high-linearity amplifier which results in exceptional strong-signal performance. This already robust front-end is further enhanced with a user-selectable preselector that can operate either in a fully automatic or user-configurable mode. As many as 119 different filter combinations can be constructed by the user (91 bandpass, 14 low-pass and 14 high-pass). The front-end employs 34 subminiature electromechanical relays (rather than often used but distortion-prone semiconductor switches) to ensure high dynamic range.

A user-selectable low-noise preamplifier provides additional sensitivity for the receiver to be able to extract even the weakest signals from noise.

An advanced dithering technique eliminates spurious signals without significantly increasing the receiver's noise floor. The superior 16-bit 100 MSPS analog-to-digital converter provides exceptional performance over an extremely wide range of signals.

The WR-G33DDC software provides an elegant and logical user interface. There are several spectrum analyzer configurations including the 50 MHz full span with 1.5 kHz resolution. The fully-zoomable display can be viewed in either the standard or waterfall mode.

The down-converted portion is highlighted and can be selected either via keyboard or by the mouse cursor and then displayed in another window, within which three independent receiver channels can exist. For any channel, the receiver's selectivity, IF shift, passband tuning, notch, and other functions can be adjusted, and the audio spectrum of the demodulated signal can be observed.

In spite of the receiver's ground-breaking architecture, the software still remains simple and intuitive to use, containing all the features generally expected in modern receivers such as noise blanking, memories, scheduler, squelch (level, voice or noise activated), numerous tuning options, and a wide choice of demodulation modes, including user-defined and optional DRM mode.

The digital down-converter provides 24 selectable output bandwidths ranging from 20 kHz to 4 MHz. The receiver's selectivity can be adjusted with 1 Hz resolution. The bandpass audio filter's low and high cut-off frequencies are graphically adjustable, as is the notch filter and noise blanker. The parameters of all three independent channels can be set separately, allowing each to be recorded simultaneously and independently. Recording and playback are also provided at the output of the digital down-converter, where an entire 4 MHz spectrum band can be recorded for later demodulation. Pre-buffering prevents signal loss at the start of a transmission.

A flexible scheduler function allows unattended recording of each channel at specified dates and times, and the built-in support for HFCC, EIBI and user-defined frequency databases ensures effortless storage and maintenance of frequencies. 

There is also a unique "pause" function, the world's first for a shortwave receiver, making it possible to pause reception and resume it when convenient. This is very useful in case the receiver is left unattended for a period of time.

A "toolbox" full of various test and measurment tools, such as frequency error, SINAD, THD and modulation meters, logger and scheduler, complement the entire package and make it possible to use this product as a measuring receiver, replacing much more expensive (and often less capable or accurate) conventional test equipment.

The software-defined architecture allows easy software upgrades for demodulation and decoding requirements. Component variations and aging are greatly diminished in a software-defined receiver, assuring long-term premium performance.

The World's Best Receiver? The World Radio TV publication (WRTH), with more than 60 years of experience, is considered to be the most accurate and complete guide to the world of radio on LW, MW, SW and FM, available in any form.  In addition, it also reviews and tests receivers, and their editors are known for their objectivity and very high, uncompromising standards. WiNRADiO leading-edge products have been honored by WRTH awards several times in the past, but the five-star award won by the WR-G33DDC 'EXCALIBUR Pro' this time, is indeed rather special. "The 'EXCALIBUR Pro' is the best SDR we have used - in some ways it is the best receiver we have used regardless of the underlying architecture - and undoubtedly represents a considerable advance in the state of the art." John Nelson, WRTH 2012. Overall rating: 5 stars 

What's included?

The standard WR-G31DDC package includes:
WR-G33DDC receiver
Application software
Comprehensive user's manual
Low-noise linear power supply
USB cable
BNC-to-SMA adapter

System requirements:  

PC with 2,4 GHz Quad core CPU or faster* One free USB 2.0 socket Windows XP/Vista/7 * Depending on available CPU resources on a particular computer, the receiver may work with lower-specification CPUs, but this may result in somewhat reduced performance in terms of maximum achievable selectivity and DDC bandwidth.

WR-G33DDC 'EXCALIBUR Pro' Specifications

Receiver typeDirect-sampling, digitally down-converting software-defined receiver
Frequency range9 kHz to 49.995 MHz
Tuning resolution1 Hz
ModeAM, AMS, LSB, USB, DSB, ISB, CW, FMN, FSK, UDM (user-defined mode)
DRM mode optional
Image Rejection100 dB
IP3+31 dBm (preamp off)
+21 dBm (preamp on)
Attenuator0 - 21 dB, adjustable in 3 dB steps
SFDR107 dB min. (preamp off)
103 dB min. (preamp on)
Noise figure14 dB (preamp off)
10 dB (preamp on)
MDS-130 dBm @ 10 MHz, 500 Hz BW (preamp off)
-134 dBm @ 10 MHz, 500 Hz BW (preamp on)
Phase noise-145 dBc/Hz @ 10 kHz
RSSI accuracy2 dB typ.
RSSI sensitivity-140 dBm
Processing and recording bandwidth
(DDC bandwidth)
20 kHz - 4 MHz
(selectable in 24 steps)
Demodulation bandwidth
1 Hz - 62.5 kHz
(continuously variable in 1 Hz steps)
Spectrum analyzersInput spectrum/waterfall, 30 or 50 MHz wide, 1.5 kHz resolution bandwidth
DDC spectrum/waterfall, max 4 MHz wide, 1 Hz resolution bandwidth
Channel spectrum, max 62.5 kHz wide, 1 Hz resolution bandwidth
Demodulated audio, 16 kHz wide, 1 Hz resolution bandwidth
ADC16 bit, 100 MSPS
(@ 10 MHz, with preamplifier)
AM-106 dBm (1.12 µV) @ 10 dB S+N/N, 30% modulation
SSB-121 dBm (0.20 µV) @ 10 dB S+N/N, 2.1 kHz BW
CW-127 dBm (0.10 µV) @ 10 dB S+N/N, 500 Hz BW
FM-117 dBm (0.32 µV) @ 12 dB SINAD, 3 kHz deviation, 12 kHz BW,
audio filter 300-3000 Hz, deemphasis -6dB/oct
Note: Below 200 kHz, the sensitivity gradually drops.
Typical figures (CW, 500 Hz BW, 10 dB S+N/N) are as follows:
 Preamp OnPreamp Off
200 kHz   -127 dBm   -123 dBm
100 kHz   -120 dBm   -116 dBm
50 kHz   -116 dBm   -112 dBm
25 kHz   -101 dBm   -97 dBm
10 kHz   -85 dBm   -81 dBm
Tuning accuracy0.5 ppm @ 25 °C
Tuning stability0.5 ppm (0 to 50 °C)
MW filterCut-off frequency 1.8 MHz @ -3 dB
Attenuation 60 dB min @ 0.5 MHz
Preselection filters119 filters available in automatic or manual mode (14 high pass, 14 low pass and 91 bandpass) + bypass
Antenna input50 ohm (SMA connector)
Output24-bit digitized I&Q signal over USB interface
InterfaceUSB 2.0 High speed
Power supply11-13 V DC @ 510 mA typ. (preamp off)
11-13 V DC @ 620 mA typ. (preamp on)
11-13 V DC @ 55 mA typ. (power save)
Operating temperature0 to 50 °C

Specifications are subject to change without notice due to continuous product development and improvement.

download brochure WR-G33DDC