WiNRADiO G305 User’s Manual
65
The attack and decay times for the three possible
Software AGC
speeds
(slow, medium and fast) can be also configured, under
SAGC Speed
Constants
on the left of the demodulator settings window:
Demodulator Structure
The G305 Professional Demodulator implements the general quadrature
representation of all narrow-band modulated signals. Such signals can always
be considered as the sum of two amplitude-modulated carriers
having a 90 degree offset, usually referred to as
I
and
Q
. Users familiar with
Software Defined Radio
digital signal processing concepts, will find the G305
Professional Demodulator to be a useful tool for experimentation and study,
where the effects of various filter settings can be easily observed and
optimized.
The entire demodulation process can be observed in the demodulator
structure window, accessible from within the demodulator settings (press the
Setup
button under the
CW
mode button), then the large
View Demodulator
Structure
button). Each mode has its own associated structure. By selecting
the mode either using the front panel or the tabs at top-right of the set-up
window, you can observe the different structures applicable to the selected
modes. Each mode also has its own set of filter settings available for
experimentation.
Did you know?
All the software-implemented digital filters used in the G305 receiver are of the linear
phase FIR (Finite Impulse Response) type, with maximum 511 taps, providing a filter
shape far superior to conventional analog hardware filters.
