Ramiaudio AUF300 Manuel Utilisateur page 21

FRONT PANEL
CHANNEL B
6
6 - Multi-turn cermet potentiometer for the sensitivity calibration on left or right level of B
channel
Variable from + 12 dBu to - 10 dBu. The sensitivity (gain of input level ) increases clockwise.
7 - Multi-turn cermet potentiometer for VCA rising time calibration of B channel (fade in time
from es clockwise.
8 - Multi-turn cermet potentiometer for VCA falling time calibration of B channel (fade out time
from 0 to 100% of the audio modulation ). Variable from 0 to 4 seconds. The time increases
clockwise.
9 - Multi-turn cermet potentiometer for the delay calibration during the transition of B channel to
A channel, after detection of signal absence on the B channel. Variable from 0 to 8 seconds.
The time increases clockwise.
Note: this regulation must be rather short time in order to avoid a too long blank at the end of
the message on the B channel, but not so long in order to avoid inopportune rising up of A
channel (during the short audio modulation blank on the B channel).
This multi-turn potentiometer (9) is only active in auto or auto + manual mode.
10 - Multi-turn cermet potentiometer for the modulation detection threshold calibration of B
channel. Variable from - 6 dBu to -36 dBu. The sensitivity (gain of detection level ) increases
clockwise. This calibration must be done after the input sensitivity (6).
Note : it must be rather sensitive in order to detect the low levels of the modulation, but not so
much to avoid triggering on the hissnoises or on the line interferences .This calibration is rather
crucial and particularly interesting on a connection with bad S/N ratio.
This multi-turn potentiometer (10) is only active in auto or auto + manual mode.
11 - Warning light indicating that channel B is open (audio proceeding).
RAmi
7 8 9 10 11
The B channel is attributed to the replacement
modulation.
(Advertisement, jingle, identification, priority
message ).
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AUF 300