User manual

AGC CALIBRATION AND SETUP (FM and ST / WEB versions) ENG
Page 41
For best performance, we recommend using Hold = 0Sec (Mode 2) for musical sources and Hold = 3 Sec (Mode 5) for
‘speech’ sources.
The MaxG (Maximum Gain) parameter sets the maximum amplification value attainable by the AGC system. For
instance, setting Mode 2 means that maximum amplification is +12dB: thus a –12dB signal can be compensated to 0,
while a –15dB signal will reach a maximum of –3dB.
We suggest setting a medium MaxGain value (no more than +12 dB, keeping in mind that this value may already be
enough to alter level ratios between different musical passages, as in the case of classical music), and Hold= 0 if the
music flow is discontinuous and immediate AGC intervention is required, or a higher Hold value (3 or 4 seconds) if any
silent breaks may occur during the broadcast (pauses in speech, line changeover between studios, etc.).
The Gate parameter indicates the threshold level under which the AGC system is frozen, and does not amplify the
signal. While operating without the signal, the display visualizes the AGC GATE status.
Once you have located this feature in the Input Calibration submenu, use the shuttle to select one of the following 5
fixed combinations (NOTE: the above parameters may not be selected or edited individually, but only within the preset
combinations):
- Mode 0 Hold=0Sec MaxG=+08dB Gate=-18dB
- Mode 1 Hold=1Sec MaxG=+10dB Gate=-18dB
- Mode 2 Hold=0Sec MaxG=+12dB Gate=-18dB
- Mode 3 Hold=2Sec MaxG=+12dB Gate=-24dB
- Mode 4 Hold=3Sec MaxG=+15dB Gate=-24dB
- Mode 5 Hold=3Sec MaxG=+20dB Gate=-24dB
- Mode 6 Hold=0Sec MaxG=+15dB Gate=-24dB
- Mode 7 Hold=0Sec MaxG=+20dB Gate=-24dB
- Mode 8 SlowAttack MaxG=+08dB
- Mode 9 SlowAttack MaxG=+12dB
- Mode10 SlowAttack MaxG=+15dB
The AGC Mode = Slow Attack option is recommended wherever audio source are affected by high-speed and
unexpected level modifications (f.i. voice or music not pre-processed) which might generate ‘pumping’ effect in the
broadcast signal. What about MaxGain parameter, see par. 5.10. Recommended setting value: MaxGain = 12 dB.
NOTE: Gate parameter is not displayed on the processor LCD panel.