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2 2 2 HARTREY AVE.. EVANSTON, I L. 6 0 2 0 4 U.S A.
DATA
MODELS
SHEET
520SL AND 520SLB
@
AREA ~ 0 ~ ~ 3 1 2 / 3 2 a - 9 0 0 0
.
CABLE SHUREMICRO
"DISPATCHER"
CONTROLLED MAGNETIC MICROPHONES
GENERAL
Models 520SL and 520SLB are integral assemblies
of a microphone, a grip-to-talk, slide-to-lock switch,
and a desk stand, with a high quality, shielded, detach-
able cable. The microphones are Controlled Magnetic
units with a frequency response of 200 to 5,000 Hz and
an omnidirectional pickup pattern.
The long-life grip-to-talk switch controls both the
microphone circuit and an external relay or control
circuit. The switch will withstand the rigorous field
requirements of paging and dispatching systems. It has
a large, comfortable grip bar which minimizes hand
and finger fatigue. After the bar is pressed, a positive
downward pressure locks the switch. The switch can-
not be accidentally locked, and the unit can be picked
up without actuating the switch.
APPLICATION
Models 520SL and 520SLB are very suitable for fixed
station use in police, fire, utility, forestry and trans-
portation services, for paging and dispatching systems,
for radio telephone and amateur use, and for similar
applications.
Model 520SL is a high-impedance microphone with
a high output level, making it suitable for public
address amplifier installations where a cable length
of 15.2m (50 ft) or less is needed.
Model 520SLB is a low-impedance microphone (150-
250 ohms) and is recommended where long cable
lengths are required.
Models 520SL and Model 520SLB are both suited
for use wjth transistor or vacuum tube amplifiers:
Model 520SL for amplifiers with high-impedance in-
puts, Model 520SLB for amplifiers with low-impedance
inputs.
INSTALLATION
Models 520SL and 520SLB are supplied with the mi-
crophone and switch assembly separate from the base
and cable. To assemble the unit, proceed as follows:
1. Place the microphone and switch assembly in
the recess at the top of the base. Fasten the
switch to the base with the special attachment
screw supplied. Use a large screwdriver or coin
to tighten the screw firmly.
2. Insert the cable connector plug into the recep-
tacle in the base of the switch. Tighten the
locking ring securely.
3. Place the cable in the groove in the bottom rear
of the base. Clamp the cable to the base by
means of the clamping plate and two machine
screws supplied.
CONNECTIONS
The internal connections of Models 520SL and
520SLB are shown in Figure 1.
SWITCH
AMRIENOL TYPE
CABLE
CARTRINE
CoNNECmffi
SHELD CONNECTED TO
WG
SCREW SHELL
IN
P U G
THROUGH
MODEL 520SL
MIR(EN0L
TYPE
CARTRlMiE
CONKCTORS
CABLE
I
RED
I
SHIELD CONNECTED TO
PLUG S K L L THRCUW
SCREW IN PLUG
MODEL 520SLB
INTERNAL CONNECTIONS
FIGURE 1
Model
520SL
is a high-impedance microphone with
a 2.lm (7 ft) two-conductor shielded cable and a
single-pole double-throw switch to control the micro-
phone circuit and an external relay or control circuit.
The WHITE cable lead is the "hot" conductor for
connection to the microphone circuit; the shield is
Copyright 1975, Shure Brothers
Inc.
27A53 (01)
(OVER)
Printed in
U.S.A.
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