WiNRADiO G65DDC User’s Guide
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However, the wideband and DDC1 spectrum displays and the main frequency
read-out will all relate to the currently received signal.
Spectrum Scopes
We have already touched on the spectrum scopes in some of the preceding
paragraphs, but there is much more to the WiNRADiO
Excalibur Sigma
spectrum scopes than just the ability to “point-and-click” tune or drag the
demodulator filter passband.
There are three spectrum scopes which effectively can be considered as
subsets of one another.
At the bottom of the application window (if the
Spectrum
button is engaged) is
the
Wideband spectrum scope
:
The
Wideband spectrum scope
displays the RF spectrum contents of the
current range which the receiver is tuned to in real time. For the
first range
this is 88 MHz wide from 0 Hz to 88 MHz, for the
second range
this is 72 MHz
wide from 118 MHz to 190 MHz.
A zoomed-in portion of the wideband spectrum is the
DCC1 spectrum
(top-
left) whose width can vary from 20 kHz to 64 MHz in 36 steps (selectable
using the
DDC1
control).
The
DDC2 spectrum (Demodulator spectrum
top-right) is a subset of the
DDC1 spectrum, making it possible to inspect the signal with the highest
resolution, and its width can vary from 20 kHz to 64 kHz in 6 steps (selectable
using the
DDC2
control).
DDC2 bandwidth always needs to be smaller or equal to that of DDC1, so if an
attempt is made to set DDC1 bandwidth to a lower value than that of DDC2,
then the DDC2 value will automatically adjust to that lower value.
