Model 522 User Guide
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
1/4 IN.
PHONE
PLUG
CONNECTOR
WHITE
AUDIO
PIN 2
PIN 3
TIP
GREEN
AUDIO
SLEEVE
GROUND
UNBALANCED
UNBALANCED
SHIELD
CHASSIS
GROUND
PIN 1
SLEEVE
MODEL 522
BASE-STATION MICROPHONE
WHITE
GREEN
SHIELD
AUDIO +
AUDIO –
PIN 2
PIN 3
PIN 1
TIP
RING
SLEEVE
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.
CHASSIS
GROUND
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
OPTIONAL CONVERSION
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.
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.
IMPEDANCE SELECTION
Use the switch located under the microphone base, near the cable entry,
to select high ("HI") or low ("LO") impedance.
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.
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.
27C687 (Rev. 6)
©2009 Shure Incorporated
Printed in U.S.A.
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