User's Manual

WiNRADiO G39DDC User’s Guide
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differences in behavior depending on which particular spectrum window the
highlighted passband is being dragged in.
Dragging the grey area in the wideband spectrum will relocate the DDC1
passband to a new frequency. However, it is not possible to drag beyond the
current spectrum boundaries; you will need to stay within the 16 MHz IF filter
passband.
Internally, the receiver’s hardware is actually tuned in multiples of 10 MHz; the
much finer tuning with 1 Hz resolution is accomplished by software processing.
This is why the center frequency of the wide-band spectrum scope is always a
multiple of 10 MHz (except at the very start of the receiver frequency range).
So, to move beyond the displayed boundaries of the wide-band spectrum
scope, you can either retune the receiver to the new frequency using any of
the standard methods, or you can move the wide-band spectrum “window” by
a multiple of 10 MHz. This “sideways” spectrum movement can be done using
these two buttons:
Inside the DDC1 and DDC2 spectra, it is actually possible to drag the
respective DDC or demodulator filter passbands beyond the existing
boundaries, in both directions. In such case, the receiver will tune
automatically and the wide-band spectrum will be updated in 10 MHz steps as
required.
Except for LSB and USB modes, dragging either one of the edges of the
greyed-out area inside the demodulator spectrum will result in continuously
changing the filter bandwidth. (This function is not available in the DDC2
spectrum so as to prevent unwanted dragging of the entire passband when the
shaded area becomes too narrow with larger DDC2 bandwidths.)