Software description
Main window
HF AGC Max – the HF AGC System uses an algorithm, which evaluates the input
signal level and switches the attenuator in a way that avoids any overload of the
receiver.
16 Audio AGC button
On/off switch for Audio AGC. This system compensates changing levels of the
received signal. It should be switched off only in specific measurement tasks.
Audio AGC has three fixed modes (speed): Fast, Medium, Soft –
and three tunable: User 1, User 2, User 3. Choosing one of these
three modes is made by a right mouse click on the button. Mode is
set separately for each demodulator (AM, SSB, CW).
By clicking with the right mouse button on one of the list items
User 1-3 a window opens, giving access to settings of this AGC
mode. Rise parameter determines the speed of response of the
system at increased signal level, while Decay determines the speed
of response of the system at reduced signal level. Hang coefficient is
dimensionless and can reduce the AGC response to transients. The larger the Hang
coefficient, the less AGC responds to the "clicks".
17 Audio AGC value
When the Audio AGC is disabled, the amplification factor can be adjusted
manually (dB).
18, 19 AGT/MGT button, Threshold slider
On/off switch for adaptive or manual gain threshold (AGT or MGT) function and
threshold level slider.
When AGT or MGT is switched off, the basic noise level (if there is no signal on
selected frequency) will be raised to the value set by the volume control slider.
AGT regulates AGC threshold adaptively, based on the signal levels in the selected
band and allows automatic reaction to changing signal levels within the band.
MGT allows limiting of the AGC factor manually to the specified value. This mode
can be useful if one or several more powerful stations are in the band, as a selected
AGC would substantially reduce the volume level.
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