Clear-Com AB-120 - Manual (Page 16)

Clear-Com Communication Systems
AB-120 Announcer Console Instruction Manual
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Dip Switch Selection of Earphone Output
Each earphone amplifier has an eight position dip switch providing a
selection of inputs to that amplifier. S2 is for the left ear and S3 is for
the right. Any or all of the inputs can be selected at the same time.
The following illustrates the function of each dip switch.
Figure 1-6: DIP Switch Settings for S2 and S3
It will be noted that each of the IFB inputs has two dip switches and
each has different gains associated with it. Dip switch 4 is for a 0 dB
input on the IFB channel. Dip switch 3 is for a lower level on the same
IFB input. If the IFB source is a balanced input or from a TW type
system, then the 0 dB setting should be used. If the IFB source is from
a Clear-Com Party-Line system, then the -15 dB setting is used.
Headphone Sidetone Adjustment
If either talkback channel is selected for listening in the headphone,
adjust R41 on the main PCB for the desired amount of talkback that is
to be heard in the earphone.