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 =
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