Shure_522_user
222 HARTREY AVE., EVANSTON, IL. 60204 U.S.A.
Ea of pn LPN | == MICROPHONES AND ELECTRONIC COMPONENTS |
MODEL 522
® AREA CODE 312/866-2200 + CABLE: SHUREMICRO
TWX: 910-231-0048
TELEX: 72-4381
UNIDIRECTIONAL DYNAMIC BASE STATION MICROPHONE
GENERAL
The Model 522 is a dynamic base station microphone
having unidirectional characteristics designed espe-
cially for radio communications, paging and dispatch-
ing systems.
This cardioid (unidirectional) pickup pattern sup-
presses unwanted background noise — the type of
noise generated by other dispatchers working nearby,
by ventilating equipment, or by office machines in the
same area. In addition, it also eliminates or reduces
feedback in public address paging applications.
Microphone Features:
= Dual impedance (19 to 300 ohms or High)
= Impedance 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 mi-
crophone case
= Adjustable microphone height
= Dependability—under all operating conditions
PRESS-TO-TALK SWITCH OPERATION
The finger-tip control bar can be used as a locking
or nonlocking switch. To use as a nonlocking switch,
simply depress the control bar and release after trans-
mission. 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
High or low impedance is selected by the switch
located on the under side of the microphone base near
the cable entry. The microphone is shipped with the
switch in the “HI” position.
The low-impedance connection is recommended
where long cable lengths are required or under con-
ditions of severe hum disturbance. The permissible
cable length is practically unlimited, since neither
response nor level is appreciably affected. Shure Model
A95 Series Line Matching Transformers are available
for use in those cases where a low-impedance micro-
phone line is desirable but the associated amplifier
has a high-impedance input. These transformers pro-
vide 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.
Copyright 1978, Shure Brothers Inc. (OVER)
27A687 (RB)
CONNECTIONS
Figure 1 shows the internal wiring of the Model 522
microphone.
POSITIVE PRESSURE PRODUCES POSITIVE VOLTAGE
ON GREEN CABLE LEAD—HIGH IMPEDANCE;
ON WHITE CABLE LEAD—LOW IMPEDANCE
CODED
TERMINAL
SWITCH SHOWN
IN"HI" POSITION
SWITCH
ACTION SHIELD
= 14 A = = = рут === ина
| T A +1 ¿1 GREEN
| ®——— ——— но
7 неа
|
AZ WHITE —
LA
RED
BLACK
INTERNAL CONNECTIONS
FIGURE 1
For unbalanced high-impedance operation, with the
Impedance Switch in the “HI” position (as shipped),
the WHITE cable lead is the “hot” conductor for the
microphone circuit; the GREEN cable lead and the
shield are connected to the amplifier or chassis
ground. The RED and BLACK leads control an external
relay or switching circuit.
For balanced-line low-impedance operation, with
the Impedance Switch in the “LO” position, the WHITE
and GREEN cable leads are the “hot” conductors for
the microphone circuit; the shield is connected to the
amplifier or chassis ground. The RED and BLACK leads
control an external relay or switching circuit.
Printed in U.S.A.
U. 5. Patents 3,132,713 and 3,240,883
SPECIFICATIONS
Type
Dynamic
Frequency Response
60 to 11,000 Hz (see Figure 2)
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TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
Cardioid (unidirectional)—uniform with frequency,
symmetrical about axis (see Figure 3)
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A - AT 70 HERTZ at
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Fr 280 TO 3,500 HERTZ. Cor
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TYPICAL DIRECTIONAL PATTERN
FIGURE 3
Impedance
Dual. Microphone rating impedance is 150 ohms
(170 ohms actual) for connection to microphone
inputs rated at 19 to 300 ohms and “High” for con-
nection to high-impedance microphone inputs. Switch
is in high-impedance position as supplied. To
change impedance, see sections on Impedance Se-
lection and Connections.
Output Level (at 1,000 Hz)
Impedance
LOW HIGH
Open Circuit Voltage® ....... .—80 dB —57 dB
(10 mV) (1.42 mV)
Power Level** .............. —57 dB
*0 dB = 1 volt per microbar
**0 dB = 1 milliwatt with 10 microbars
Switch
Press-to-Talk Switch—locking or nonlocking opera-
tion 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
Cartridge Shock Mount
Internal rubber vibration-isolator
Cable
2.1m (7 ft) four-conductor, two conductors shielded,
nondetachable
Case
Two-tone gray ARMO-DUR® with dull-chrome plated
copper-brazed steel screen
Dimensions
See Figure 4
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XA B30 ma (2-172 IH)
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ELIGE MÁNGE nr
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aa
OVERALL DIMENSIONS
FIGURE 4
Net Weight
736 grams (1 Ib 10 oz)
Shipping Weight
1020 grams (2 Ib 4 oz)
REPLACEMENT PARTS
Cartridge ........02200 000000 ae ne nee ne na ua 00 0 R89
Cable .....22222 0444444 4444 44e ea a ae aa ene 4 6 .C70
On-Off Switch ........... iii... .RK1415
Screen and Grille Assembly ............... .RK131G
Housing Assembly ........... coin... .RK130C
Base Assembly .......... oii. RK139B
Bottom Plate Assembly .................... RK132B
Transformer ........ iii 51B44
GUARANTEE
This Shure product is guaranteed in normal use to
be free from electrical and mechanical defects for a
period of one year from date of purchase. Please
retain proof of purchase date. This guarantee includes
all parts and labor. This guarantee is in lieu of any
and all other guarantees or warranties, express or
implied, and there shall be no recovery for any con-
sequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention: Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.
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