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Model 522 User Guide
27C687 (Rev. 6) Printed in U.S.A.
©2009 Shure Incorporated
MODEL 522
BASE-STATION MICROPHONE
The Model 522 is a dynamic base-station microphone for radio
communications, paging, and dispatching systems. Its cardioid
(unidirectional) pickup pattern suppresses unwanted background noise
from nearby dispatchers, ventilating equipment, or office machines. It also
can reduce 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 microphone case
Adjustable microphone height•
Dependable under most operating conditions•
Conversion kit available for Monitor/Transmit switching•
PRESS-TO-TALK SWITCH OPERATION
Press and hold the bar switch to talk. To lock the switch, press and pull it
forward. To unlock the switch, move the bar back and release.
IMPEDANCE SELECTION
Use the switch located under the microphone base, near the cable entry,
to select high ("HI") or low ("LO") impedance.
Use the low-impedance position for long cable lengths under conditions
of severe hum disturbance. Use Shure Model A95 Series Line Matching
Transformers when using a low-impedance microphone line with a high-
impedance amplifier input.
OPTIONAL CONVERSION
Use the optional monitor split-bar with receivers that have a squelch
circuit. Depressing the monitor bar disables the squelch so the operator
can verify there are no other transmissions below the squelch threshold
before transmitting.
The Transmit/Monitor Switch Kit is Shure Model RK199S. General
microphone wiring instructions are supplied with the kit, but specific
transceiver wiring details must be obtained from the transceiver schematic
and/or the manufacturer of the unit.
LOGIC CONNECTIONS
The RED and BLACK leads may be used to control an external relay or
switching circuit.
AUDIO CONNECTIONS
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 WIRE
COLOR
FUNCTION XLR
CONNECTOR
1/4 IN.
PHONE
PLUG
UNBALANCED
WHITE AUDIO PIN 2 TIP
GREEN AUDIO
GROUND
PIN 3 SLEEVE
SHIELD CHASSIS
GROUND
PIN 1 SLEEVE
UNBALANCED
WHITE AUDIO + PIN 2 TIP
GREEN AUDIO – PIN 3 RING
SHIELD CHASSIS
GROUND
PIN 1 SLEEVE