Utilizing a dip switch for tone selection and quick connect screw terminals, various configurations can be evaluated quickly. In addition, a smaller sub-circuit may be snapped apart from the main PCB board for an embeded evaluation. In systems where multiple receivers are connected to a common transmitter, control signals can be used to select individual or grouped receivers as found in intercom and radio systems. LMR radio systems identify traffic which must be re-transmitted on repeaters for longer range communications. Intercom allows audience selection using push-button control.
Caller identification uses caller's subaudio signal tone as identification code.
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