Bogen GS-250 - Manual (Page 12)

Operation
Telephone Paging Control
The MIC 5/Tel volume control on the front panel con-
trols the volume of the telephone paging input when
the control is set to the Tel mode (See page 6 for infor-
mation on setting the Tel input mode).
The Tel input mode uses voice activated triggering for
muting the AUX inputs and automatic level control for
providing constant paging level. To optimize Tel input
performance the ALC control may need to be adjusted.
ALC
The telephone page input features an
automatic level control (ALC) which
compensates for different voice levels
and speaking styles of the individuals
using the system. The amplifier is
shipped with this control in the OFF
(max. counterclockwise) position.
To adjust the ALC:
1.Rotate the MIC 5/TEL and MASTER controls to the
highest level likely to be used.
2.Speak softly and distinctly into the telephone mouth-
piece while adjusting the MIC 5/TEL volume control
to the desired output level.
3.Speak in a loud voice directly into the telephone
mouthpiece while rotating the ALC control clockwise
to the point where the output of the amplifier is
reduced to the same level as that obtained in
Step 2.
4.The MIC 5/TEL and MASTER controls can be used
to vary the overall volume without upsetting the ALC
adjustment.
VOX
The telephone page input features
voice activated Aux muting. This
feature always mutes AUX 2 and
only mutes AUX 1 when the
AUX1/MIC 6 is set in that position.
The VOX control should be set so that only the
desired signal is above the threshold level, while
unwanted noise or signal is below it.
To adjust the sensitivity of the circuit:
1. Rotate the VOX control fully clockwise. While mak-
ing a public address announcement and talking at a
low level, the sound should not be choppy or miss-
ing parts of words. If it is choppy or intelligibility is
poor, rotate control counterclockwise to the point
where the sound is clear and crisp (but not to the
maximum counterclockwise position).
2. If the background music shuts down when no page
is in progress, rotate the control counterclockwise
until the music will not shut down when no page is
in progress.
VAR MUTE
The VAR MUTE control mutes the
Aux input(s) only during telephone
pages.
The control allows the user to select from 4 levels of
muting: 1 = -60dB, 2 = -21dB, 3 = -10dB, 4 = 0dB.
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