User's Manual

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Appendix D - Inside WR-G3 SERIES
Technically minded users may like to explore the WiNRADiO G3 SERIES
Receiver and experiment with some of the innovative concepts of
Software
Defined Radio
.
The WiNRADiO G3 SERIES Receiver is the world’s first commercially
available
Software Defined Radio
, where the Demodulator function is fully
performed in software running on a standard PC. It is also the world’s first
shortwave radio on a PCI card. The potential for experimentation is
therefore substantial. This receiver and its software have been indeed
designed to promote and encourage such experimentation.
The WiNRADiO G3 SERIES receiver represents only a half of the entire
radio. The other half is your PC.
The receiver hardware contains the following functional blocks:
The incoming signal from the antenna (in the 9 kHz to 30 MHz range) is
filtered and amplified, then fed into a mixer. Here it is mixed with the first LO
(local oscillator), which is performed by a DDS (Direct Digital Synthesizer),
with a PLL (Phase Locked Loop). The resulting 45 MHz intermediate
frequency is filtered using a 4-pole 45 MHz crystal filter with an IF bandwidth
of 15 kHz, and then amplified.