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| Overview
The WiNRADiO WR-G31DDC 'EXCALIBUR' is a high-performance,
low-cost, direct-sampling, software-defined, shortwave receiver with a
frequency range from 9 kHz to 50 MHz. It includes a real-time
50 MHz-wide spectrum analyzer and 2 MHz-wide instantaneous bandwidth
available for recording, demodulation and further digital processing.
The receiver's superior performance results from its innovative,
direct-sampling, digital down-converter 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 tuning
accuracy. These key features create a receiver in a class of its own,
with wide application potential, at a very affordable price. |
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| Graphical User Interface Software
The WR-G31DDC 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. |
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| The digital down-converter provides 21 selectable output bandwidths
ranging from 20 kHz to 2 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 2 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.
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.
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9
kHz to 49.995 MHz continuous frequency range