AB-120 Announcer Console
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.
Note:
R41 is close to S2 on the original AB-120 and beside J11 on the AB-120 MK2
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