Description
The talkback circuitry in the box produces a line level (nom -10db) output that is transformer isolated to eliminate ground loops. The "TALKBACK BOX" contains a complete 2 channel (Interrupted and Non Interrupted) RTS equivalent IFB station. Power for the talkback circuitry is provided by the IFB station plugged into the box. The AIR Microphone circuit is completely passive. If the power to an IFB station is lost , only the IFB and talkback functions will be lost - the air microphone circuit will still function normally. The talkback output level is fixed at about -10db. This level, when fed into the line level input of a speaker amplifier should allow the amplifier gain pot to run about midrange. The level is low enough that no crosstalk problems should be experienced in bringing the talkback signal back down the mic level audio mult.