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. The mic also eliminates or reduces feedback in public address paging applications.
Shure 522 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 microphone case
Adjustable microphone height
Dependability -- under all operating conditions
Conversion kit available for Monitor/Transmit switching
Shure 522 Specifications:
Frequency Response: 60 to 11,000 Hz
Polar Pattern: Cardioid (unidirectional) - uniform with frequency, symmetrical about axis
Impedance: Dual. Microphone rating impedance is 150 ohms (260 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms and "High" for connection to high-impedance microphone inputs. Switch is in high-impedance position as supplied.
Sensitivity (AT 1,000 HZ): Open Circuit Voltage*: Low —57.0 (1.3 mV); High —38.5 dB (12 mV) (*1 Pa=94 dB SPL)
Switch: Press-to-Talk Switch - locking or nonlocking operation to actuate microphone circuit and an external relay or control circuit. Microphone circuit normally shorted in both high and low impedance; impedance Selection Switch: Double-pole double- throw slide switch in microphone base to provide either high- or low-impedance operation