Specifications

14
Frequency and tuning (6)
This indicator always shows the current tuned frequency. If the operation mode is not set to “Center” (in the “IF FILTER”
section), the AR-Alpha frequency can be different; frequency shift in this case is made by the software. The current frequency
can be tuned using the mouse wheel while hovering with the pointer on the desired frequency digit. Double clicking on the
frequency indicator, a dialog window will appear, allowing direct frequency input. Frequency can also be tuned dragging the
main spectrum window (clicking with the left mouse button and moving the mouse left/right while on the main spectrum
window).
Main spectrum view Secondary spectrum view Frequency indicator
Mouse
drag
If not in “Center” mode, the grey bar can be dragged
on the waveform.
Fine tuning can be done dragging
the waveform (a red vertical line
shows current position).
No effect.
Double
click
In “Center” mode, the receiver will tune to the
requested frequency. Otherwise, software frequency
shift will be used to tune the requested frequency.
The software will tune to the selected
frequency.
The direct frequency input
dialog will pop up.
Mouse
wheel
Currently tuned frequency will be shifted upwards or
downwards depending on wheel rotation direction and
value set in the “Wheel Step” box.
Filter width (highlighted as a grey
zone) will vary symetrically.
Currently hovered frequency
digit changes according to
mouse wheel rotation.
Waterfall controls (7)
On the right side of the software window, there are three sliders that control waterfall appearance. From the top to bottom, the
sliders control: waterfall speed, brightness and contrast. They can be operated by dragging the slider or using the mouse wheel
while hovering over the controls.
Span (8)
It's possible to select the desired frequency span by clicking on the arrow buttons in the Span field. The smaller the span, the
slower the main spectrum window will refresh.
FFT Resolution (9)
“Time”, “Mix” and “Freq” allow you to select the desired FFT characteristics, preferring update rate or FFT spectral resolution.
Volume control (10)
“AF Vol” controls output volume. Clicking on the button, the output can be muted; the slider controls volume output level. In
“DRM” and “USER” mode there is no sound card output (all data is redirected to the Virtual Audio Cable).
IF Filter (11)
The “IF Filter” section allows selecting the AR-Alpha I/Q output bandwidth. The “Center” button forces the currently
demodulated signal to be in the center of the main spectrum windows (and disables the software frequency conversion block).
If not selected, all viewable frequencies are tunable without changing the AR-Alpha tuned frequency (through software
frequency conversion).