Hello Mike,
As Gary correctly explained, the two split parts of the spectrogram can
cover different frequency ranges (you can move the scales around by
pulling them with the mouse), but they will run at the same scroll rate
(and FFT resolution). To activate split-scale mode, right click into the
frequency scale and select "split scale". To change the displayed
frequency range, pull the scale with the mouse, zoom in & out, etc.
For two frequency ranges which cannot be covered by a single FFT (for
example, the 6 kHz band and the 9 kHz band with µHz resolution), you
need the dual channel mode. This means different center frequencies for
the complex FFTs (but still the same size and scroll rate,
unfortunately). For this mode, two input channels for the spectrum
analyser must be activated: Select "Components" in the main menu,
"Circuit Window". In the lower part of the block diagram is the spectrum
analyser with two inputs. Click on the right input box in the circuit,
and (for simplicity) select the same source as for the left input. This
will activate the 2nd FFT channel, and also a 2nd section of the
waterfall / spectrum display. The center frequency for the FFT can be
modified under "Options".."FFT settings".
To run multiple displays at different speeds, and different FFT
resolutions, launch the program two or more times. Each running instance
will use its own, individual configuration (save in its own file) so
they can be launched from the same directory.
The multistrip mode was designed to display "long CW messages" (etc) in
a narrow frequency range only.
Cheers,
Wolf .
Am 04.03.2011 20:37, schrieb Mike Dennison:
I have been trying to produce a multiple display on Spectrum Lab like
the grabbers do, but I can't find how to achieve it. I can find a
reference in the Help file to "multistrip" and can split my screen,
but each strip is the same as the top one and cannot be altered. The
Help file talks about 'new' displays being added at the top, but I
can't find how to add a 'new' display.
Ideally I wan't to combine a wide, fast display and one or more
narrower slow displays.
Has anyone else been as baffled as me and can explain it in simple
terms?
Mike, G3XDV
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