Model 522 User Guide
IMPEDANCE SELECTION Use the switch located on the under side of the microphone base, near the cable entry, to select high or low impedance. The microphone is shipped with the switch in the �HI� position. Use the low-impedance position for long cable lengths under conditions of severe hum disturbance. Unlimited cable lengths are possible without appreciably affecting response or level. Use Shure Model A95 Series Line Matching Transformers when using a low-impedance microphone line with a high-impedance amplifier input. These transformers provide a proper impedance match between a 19 to 300 ohm microphone line and a high-impedance input and are available with various input and output connectors. AUDIO CONNECTIONS (See Table 1) Unbalanced high-impedance operation: Set the impedance switch to the �HI� position (as shipped). Connect the GREEN cable lead and the shield to the amplifier or chassis ground. The WHITE cable lead is the �hot� conductor. Balanced-line low-impedance operation: Set the impedance switch to the �LO� position. Connect the shield to the amplifier or chassis ground. The WHITE and GREEN cable leads are the �hot� conductors. TABLE 1. CABLE-TO-CONNECTOR WIRING
INPUT TYPE UNBALANCED WIRE COLOR WHITE GREEN SHIELD BALANCED WHITE GREEN SHIELD FUNCTION AUDIO AUDIO GROUND CHASSIS GROUND AUDIO + AUDIO CHASSIS GROUND XLR CONNECTOR PIN 2 PIN 3 PIN 1 PIN 2 PIN 3 PIN 1 1/4 IN. PHONE PLUG TIP SLEEVE SLEEVE TIP RING SLEEVE
MODEL 522 UNIDIRECTIONAL DYNAMIC BASE STATION MICROPHONE The Model 522 is a dynamic base station microphone designed especially for radio communications, paging, and dispatching systems. Its cardioid (unidirectional) pickup pattern suppresses unwanted background noise-the type of noise generated by other dispatchers working nearby, by ventilating equipment, or by office machines in the same area. It also eliminates or reduces feedback in public address paging applications. The 522 can be converted to Monitor/Transmit switching with the Shure RK199S Split-Bar Conversion Kit. FEATURES � � � � � � � � Dual impedance (19 to 300 ohms or High) lmpedance change switch for convenient change-over Finger-tip control bar (locking or non-locking action) to actuate microphone circuit and an external relay or control circuit Long-life switch to satisfy rigorous requirements of communications and paging systems Sturdy, high impact ARMO-DUR® base and micro-phone case Adjustable microphone height Dependability - under all operating conditions Conversion kit available for Monitor/Transmit switching
LOGIC CONNECTIONS The RED and BLACK leads may be used to control an external relay or switching circuit.
PRESS-TO-TALK SWITCH OPERATION The finger-tip control bar can be used as a locking or non-locking switch. To use as a non-locking switch, simply depress the control bar and release after transmission. To use as a locking switch, depress the control bar and pull it forward. To unlock the switch, move the bar back and release.
INTERNAL CONNECTIONS FIGURE 1 OPTIONAL CONVERSION A split-bar Transmit/Monitor Switch is available for use with transceivers with a receiver squelch circuit. Depressing the Monitor bar disables the receiver squelch circuit so that the operator can
