S E T U P F O R M C H A P T E R 4
AGC/ALC Sub-Tab
Figure 103: Setup Form - DSP Tab, AGC/ALC Sub-Tab
These controls allow the user to customize the AGC/Leveler/ALC to their own particular tastes.
AGC
The AGC is a state of the art, dual track AGC with anticipatory response on both fast and slower tracks.
Or, stated differently, the AGC is in essence the combination of two AGCs, one with a very fast time
constant, the other with a much slower time constant (for more detail see the article A Discussion on
the Automatic Gain Control (AGC) Requirements for PowerSDR on the Downloads page of our website
at http://support.flex-radio.com/Downloads.aspx?fr=1). The Attack, Decay and Hang settings may
only be adjusted when the Front Panel AGC control is set to Custom. However, they do display the
values for the selected AGC setting.
Slope (dB): The AGC gain once the signal is above the AGC threshold (or knee, not to be
confused with the Hang Threshold below). Setting a Slope higher than 0dB allows stronger
signals above the threshold to sound louder than weaker ones (also above the threshold).
Max Gain (dB): The maximum amount of gain allowed by the AGC system for signals below
the AGC threshold. The total AGC gain equals the Max Gain + the Slope (Gain). See also
Appendix C.
109 2003-2008 FlexRadio Systems
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