IQ32 SDR TRANSCEIVER OPERATIONS MANUAL
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FFT Display
The large box on the upper right of the screen is the FFT window. This is the most interesting
part of the display and one feature that makes this product unique. The FFT (Fast Fourier
Transform) analysis can be displayed in one of two different formats. The previous figures
showed the FFT operating in Spectrum mode. The other mode is the Waterfall mode. You can
switch between the two FFT display modes with the
WF/Sp
on-screen button.
The FFT spectrum view, Figure 64, shows a spectrum display or panadapter view of a 4kHz
portion of the spectrum. The height of the blue pixels relates to the strength of signals in the
window. The position (left to right) corresponds to the frequencies in the window. In CW mode,
the red line indicates the tuned frequency.
This Spectrum display allows you to see other signals in your 4kHz chunk of the radio spec-
trum. A taller blue bar means a stronger signal.
The Waterfall view, Figure 65, is a more complex way to view signals. Both time and intensity
are shown on the screen. The signal strength is shown in color, ranging from black (no signal)
to red (a very strong signal). The color display slides downward in time on the screen, so in-
stead of showing only the current signal status, it shows a short history of what the signals
have been. For any digital signals like CW or PSK, it's a wonderful way to look at the world.
Touching the
WF/Sp
button toggles between the two perspectives. Tune to the desired fre-
quency using the right rotary encoder and the
Memory Manager
buttons.
In PSK mode, with your finger or a stylus, you may change frequency by touching the waterfall
display at the location of the desired signal or frequency.
Figure 65:Waterfall View
Figure 64: FFT Spectrum View
