Shure 522 User manual

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 pat-
tern 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 ad-
dress 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 con-
trol circuit
•Long-life switch to satisfy rigorous requirements of com-
munications and paging systems
•Sturdy, high impact ARMO-DURRbase and micro-
phone case
•Adjustable microphone height
•Dependability — under all operating conditions
•Conversion kit available for Monitor/Transmit switching
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 de-
press 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.
IMPEDANCE SELECTION
Use the switch located on the under side of the micro-
phone base, near the cable entry, to select high or low im-
pedance. 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 re-
sponse 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 avail-
able 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 im-
pedance 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
WHITE AUDIO PIN 2 TIP
UNBALANCED GREEN AUDIO GROUND PIN 3 SLEEVE
SHIELD CHASSIS GROUND PIN 1 SLEEVE
WHITE AUDIO + PIN 2 TIP
BALANCED GREEN AUDIO – PIN 3 RING
SHIELD CHASSIS GROUND PIN 1 SLEEVE
LOGIC CONNECTIONS
The RED and BLACK leads may be used to control an
external relay or switching circuit.
INTERNAL CONNECTIONS
FIGURE 1
OPTIONAL CONVERSION
A split-bar Transmit/Monitor Switch is available for use
with transceivers with a receiver squelch circuit. Depressing
Model 522 User Guide
27B687 (BH)
2002, Shure Incorporated Printed in U.S.A.

the Monitor bar disables the receiver squelch circuit so that
the operator can determine the presence of signals below
the squelch threshold before transmitting. The Monitor
switch is either momentary or locking; and the switch can be
wired either to ground or to unground the squelch circuit. The
Transmit switch bar can be depressed only while the Monitor
bar is depressed, thus requiring the operator to verify that
the channel is idle before transmitting. The Transmit switch
is momentary only and cannot be locked. The Transmit/
Monitor Switch Kit is Shure Model RK199S. General micro-
phone wiring instructions are supplied with the kit, but specif-
ic transceiver wiring details must be obtained from the
transceiver schematic and/or the manufacturer of the unit.
SPECIFICATIONS
Type
Dynamic
Frequency Response
60 to 11,000 Hz (see Figure 2)
Hz
dB
TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
Cardioid (unidirectional) —uniform with frequency,
symmetrical about axis (see Figure 3)
FIGURE 3
lmpedance
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. To change imped-
ance, see sections on lmpedance Selection and Con-
nections.
SENSITIVITY (at 1,000 Hz)
LOW HlGH
Open Circuit Voltage* –57.5 dB –38.5 dB. . . . . . . . . .
(Ref. 1V/Pascal) (1.3 mV) (12 mV)
*(1 Pa = 94 dB SPL)
Switch
Press-to-Talk Switch —locking or nonlocking op-
eration to actuate microphone circuit and an external
relay or control circuit. Microphone circuit normally
shorted in both high and low impedance
lmpedance Selection Switch —double-pole double-
throw slide switch in microphone base to provide ei-
ther high- or low-impedance operation
Cartridge Shock Mount
lnternal rubber vibration-isolator
Cable
2.1 m (7 ft) four-conductor, two conductors shielded
non-detachable
Case
Two-tone gray ARMO-DURRwith dull-chrome-plated
steel screen
Dimensions
See Figure 4
OVERALL DIMENSIONS
FIGURE 4
Net Weight
736 grams (1 Ib 10 oz)
Shipping Weight
1020 grams (2 Ib 4 oz)
REPLACEMENT PARTS
Cartridge R89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable C31C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On-Off Switch RK141S. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPTIONAL CONVERSION PART
Transmit/Monitor Split-Bar Switch Kit RK199S. . . . . . . . .
For additional service or parts information, please con-
tact Shure’s Service department at 1-800-516-2525. Out-
side the United States, please contact your authorized
Shure Service Center.
SHURE Incorporated Web Address: http://www.shure.com
222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A.
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