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222
HARTREY AYE
.
EVANSTON
ILL.
CABLE
SHUREMICRO
Models
DATA SHEET
EVANSTON PHONE DA
89000
.
CHICAGO PHONE
SH
3
1600
440
and
440SL
General:
Model 440 and Model 440SL microphones
are pressure operated units using the balanced armature
controlled magnetic principle and especially designed to
have high intelligibility for radio communications and
are especially designed for the narrow audio frequency
range required for single side band transmission. The
microphones have high output level, smooth response,
and a semi-directional pickup characteristic.
The Model
440SL
is
an integral assembly of a micro-
phone, a grip-to-talk, slide-to-lock switch (see operation)
and a desk stand. The grip-to-talk switch is similar to the
Shure
A88A,
having the same long-life features to with-
stand the most severe field requirements of paging and
dispatching systems. The switch has a large comfortable
grip bar which minimizes hand and finger fatigue. After
the bar
is
pressed, a positive downward pressure on the
grip bar locks the switch. The switch cannot be acci-
dently locked, and the unit can be picked up without
actuating the switch.
The microphone case, switch case, and the stand are
of die cast metal and are streamlined for improved
acoustical performance and modern appearance.
Applications:
The Model 440 and the Model 440SL
are particularly suited for use in single side band trans
mission as used in mobile and fixed station use in Police,
Fire, Utility, Forestry Transportation Services and Ama-
teur Communications. The response cuts off sharply be-
low 300
c.p.s. and above 3000 c.p.s. with an average
rising characteristic for speech intelligibility. This re-
sponse characteristic is especially effective in the pres-
ence of noise.
The Model 440 and
440SL are, also, suitable for pub-
lic address, call systems and radio telephone.
Installation:
The Model 440 microphone has
a
standard
5/8"-27
thread and can be mounted on any
desk or floor stand.
In the Model
440SL assembl
,
the microphone and
switch are pre-assembled, but
t
X
e base and cable and
plug assembly are separate. To assemble base to switch
use the following instructions:
I.
Place microphone switch assembly in the recess
at the top of the base. Fasten switch to base
by
means of special attachment screw included. Use
a large screw driver or coin to turn screw down
tightly.
2.
Insert cable-connector plug into microphone re-
ceptacle.
Turn locking ring down tightly.
3.
Place cable in groove in the bottom rear of the
base. Clamp cable to base
by
means of the
clamping plate and two machine screws which
are furnished.
Connections:
Most amateur equipment is wired to
use either
VOX
(voice o erated relay control) or a push-
to-talk switch. The Mo
!
el 440SL has been designed Yo
provide maximum flexibility with both types of operation.
SWITCH
-
MOVEMENT
I
BLACK
BLACK
.-
BLUE
L
GREEN
RED
Copyright 1960, Shure Brothers, Inc.
274158 (8-63)
FIG.
A
Printed in
U.S.A.