Robotron Pty Ltd G9P Benutzerhandbuch
WiNRADiO G39DDC User’s Guide
69
Spectrum Scopes
We have already touched on the spectrum scopes in some of the preceding
paragraphs, but there is much more to the WiNRADiO Excelsior spectrum
scopes than just the ability to “point-and-click” tune or drag the demodulator
filter passband.
paragraphs, but there is much more to the WiNRADiO Excelsior spectrum
scopes than just the ability to “point-and-click” tune or drag the demodulator
filter passband.
There are three spectrum scopes that can be effectively considered to be
subsets of one another.
subsets of one another.
At the bottom of the application window, if the Spectrum button is engaged,
there is the Wideband spectrum scope:
there is the Wideband spectrum scope:
The Wideband spectrum scope displays, in real time, the RF spectrum
contents of what is commonly referred to as the “instantaneous” or “stare”
bandwidth of the receiver. It is always 16 MHz wide, reflecting the bandwidth
of the last intermediate frequency amplifier of the analog front-end of the
receiver. It is also always centered at multiples of 10 MHz (except at the low-
end of the receiver frequency range), because, internally, the receiver
hardware is tuned in multiples of 10 MHz (while the fine-resolution 1 Hz tuning
is then performed digitally inside these 10 MHz wide “chunks”).
contents of what is commonly referred to as the “instantaneous” or “stare”
bandwidth of the receiver. It is always 16 MHz wide, reflecting the bandwidth
of the last intermediate frequency amplifier of the analog front-end of the
receiver. It is also always centered at multiples of 10 MHz (except at the low-
end of the receiver frequency range), because, internally, the receiver
hardware is tuned in multiples of 10 MHz (while the fine-resolution 1 Hz tuning
is then performed digitally inside these 10 MHz wide “chunks”).
A zoomed-in portion of the wideband spectrum is the DCC1 spectrum, whose
width can vary from 20 kHz to 4 MHz in 24 steps (selectable using the DDC1
control).
width can vary from 20 kHz to 4 MHz in 24 steps (selectable using the DDC1
control).
The DDC2 spectrum 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 320 kHz in 13 steps (selectable using the DDC2 control).
inspect the signal with the highest resolution, and its width can vary from
20 kHz to 320 kHz in 13 steps (selectable using the DDC2 control).