WiNRADiO G315 User’s Manual
23
In addition to the usual and self-explanatory
AM
,
LSB
,
USB
,
CW
and
FM
modes, there is also
AMS
(synchronous AM),
DSB
(dual sideband,
suppressed carrier) and
ISB
(independent sideband). The wide-FM mode
(
FMW
) is available as a factory installed option.
For ISB, the audio output can be selected between the lower and upper side
bands using two selector USB and LSB buttons accessible under the
Setup
button:
Note: Both channels of the ISB transmission can be recorded simultaneously
using the recording facility of the G315 receiver. (In such case, the LSB and
USB signals are recorded as left and right channels of a stereo recording.)
Real-time Spectrum Scope
The real-time spectrum display shows the actual situation within the bandwidth
of the receiver. The spectrum scope shows an area of 20 kHz wide (as defined
by the receiver's roofing filter). The IF (intermediate frequency) bandwidth and
center frequency is software-defined and can be changed by the user to fall
anywhere within the 20 kHz area. When you press the mode buttons, you will
note that the central highlighted region of the spectrum changes its width. This
corresponds to the IF filter bandwidth associated by default with the different
modulation modes. All these default values can be overridden and finely
adjusted.
The
Video filter
is a low-pass filter used to smooth the displayed
spectrum.
When activated, the smoothness of the spectrum trace increases
when the cut-off frequency decreases. The frequency can be adjusted either
by direct typing in the edit box, or by clicking the up/down arrow keys, or, more
conveniently, by dragging the little slider between the up/down keys.
