Shure 4078 Datasheet

CONTROLLED MAGNETICm HAND MICROPHONE
222 HARTREY AVENUE
S H U m
@
EVANSTON. ILLINOIS 6 0 2 0 2 - 3 6 9 6 U.S.A.
THE SOUND OF THE PROFESSIONALSS WORLDWIDE
MICROPHONES A N D ELECTRONIC COMPONENTS
GENERAL
The Shure 407B microphone is a high-quality, ex-
tremely reliable, hand-held CONTROLLED MAGNETIC@
microphone designed for clear, crisp, natural voice
response of high intelligibility. The microphone features
professional design, smalT size, light weight, and
modular construction, providing extreme dependability
and exceptional ease of field service.
The modular construction of the 4078 accounts for
its tremendous ease of field serviceability. The car-
tridge, switch, and cable are of modular design which
makes them replaceable in a matter of minutes if re-
placement is ever necessary.
The unit fits naturally and comfortably in the hand
and is not affected by heat or humidity. The exclusive
ARMO-DURm case is immune to oil, grease, fumes, salt
spray, sun, rust and corrosion-and is outstanding in
its ability to withstand mechanical shocks and vibra-
tion. The "Million-Cycle" leaf-type switch is double-pole,
single-throw, and designed to withstand severe
operating conditions and constant usage.
DATA SHEET
MODEL 407B
I
Features:
H
Highly intelligible voice response
Unparalleled ruggedness and reliability
w
CONTROLLED MAGNETICm element
ARMO-DURm case
H
"Million-Cycle" leaf-type switch controlling
microphone and external relay or switching circuits
H
Modular construction
H
Exceptional ease of field service
w
Lifetime hang-up button and mounting bracket
H
TRIPLE-FLEX@ cable provides 3 to 4 times the flex
life of other coiled cords
APPLICATIONS
The 4078 microphone is highly recommended for all
types of mobile communications; for hams; industrial
and commercial paging; outdoor public address
systems; and all applications where a rugged hand
microphone is required. The 407B is a low-impedance
microphone and is recommended where long cable
lengths are required. The 407B is suited for use with
transistor or vacuum tube amplifiers with low-
impedance inputs.
INSTALLATION AND CONNECTIONS
A mounting bracket for permanent installation is sup-
plied with each microphone. (See Figure 1)
MOUNTING HOLES,
-(Z)6mqmlNlN.) CLEARANCE FOR
No. 8 SCREWS
7
MOUNTING BRACKET
FIGURE
1
The internal switch connections of the 407B are
shown in Figure 2.
The 4078 is a low-impedance microphone with a four-
conductor coiled-cord cable (two conductors shielded)
and a double-pole, single-throw leaf-type switch to con-
trol the microphone circuit and an external relay or
switching circuit. The WHITE and GREEN leads are the
"hot" conductors for balanced-line connection to the
microphone circuit; the shield is connected to the
microphone circuit ground. The RED and BLACK leads
control the relay or switching circuit. The microphone
circuit of the switch is normally open but may be easily
modified for normally shorted operation.
CODED
TERMINAL
INTERNAL CONNECTIONS
FIGURE 2
Copyright 1990,
Shure Brothers Inc.
27A972 (JH)
Printed in U.S.A.