User Manual

WiNRADiO G3XX User’s Manual
Appendix D – Inside WR-G3XX Hardware
Technically minded users may like to explore the WiNRADiO G3XX Receiver
and experiment with some of the innovative concepts of this Software
Defined Radio.
The WiNRADiO G3XX Receiver is one of the first commercially available
Software Defined Radios, where the Demodulator function is fully performed in
software.
The receiver hardware contains the following functional blocks:
The incoming signal from the antenna (in the 9 kHz to 1800 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 109.65 MHz intermediate
frequency is filtered using two 4-pole 109.65 MHz crystal filters with an IF
bandwidth of 15 kHz, and then amplified.
75