Model 527A User Guide
©
2006, Shure Incorporated
27B2918 (Rev. 2)
Printed in U.S.A.
MODEL 527A
DYNAMIC COMMUNICATIONS MICROPHONE
The 527A microphone is an extremely reliable, high-im-
pedance, dynamic, hand-held microphone with an extended
low- and high-frequency response particularly suited to ham
radio use, mobile FM transmission, and top-quality paging
systems. The microphone has a clear, crisp, and natural
voice response. It features professional design, small size,
light weight, and modular construction.
The modular construction of the 527A accounts for its tre-
mendous ease of field serviceability. The cartridge, switch,
and cable are a modular design, which makes them easily
replaceable, if necessary. The microphone is wired so that
the wires will not crimp or break.
The unit fits naturally and comfortably in the hand and is
not affected by heat or humidity. The exclusive AR-
MO-DUR
®
case is immune to oil, grease, fumes, salt spray,
sun, rust, and corrosion and is outstanding in its ability to
withstand mechanical shocks and vibrations. The “Mil-
lion-Cycle” leaf-type switch is double-pole, single-throw, de-
signed to withstand severe operating conditions and con-
stant usage.
FEATURES
•
Extended low- and high-frequency response
•
Highly intelligible voice response
•
Unparalleled ruggedness and reliability
•
Moving coil (dynamic) element
•
ARMO-DUR case
•
“Million-Cycle” leaf-type switch controlling
microphone and external relay or switching circuits
•
Modular construction for easy field service
•
“Lifetime” hang-up button and mounting bracket
•
Long-life neoprene-jacketed coil cord
APPLICATIONS
The 527A microphone is highly recommended for all
types of mobile communications, ham radios, industrial and
commercial paging systems, and outdoor public address
systems. The 527A is a high-impedance microphone with a
high output level, making it suitable for connection to high
impedance amplifier inputs when cable lengths of under 50
feet are needed.
INSTALLATION
A mounting bracket for permanent installation is supplied
with each microphone. The bracket has mounting holes with
clearance for No. 6 or No. 8 screws (see Figure 1).
CONNECTIONS
The internal switch connections of the 527A are shown in
Figure 2. The 527A has a three-conductor (1 shielded),
coiled cord cable and a double-pole, single-throw, leaf-type
switch to control the microphone circuit and an external re-
lay or switching circuit. The WHITE lead is the “hot” conduc-
tor for connection to the microphone circuit; the shield is
connected to the microphone circuit ground. The micro-
phone circuit of the switch is normally closed, but can easily
be modified for normally open operation.
MOUNTING BRACKET
FIGURE 1
INTERNAL CONNECTIONS
FIGURE 2
CABLE TO CONNECTOR WIRING
INPUT TYPE
WIRE
COLOR
FUNCTION
XLR
CONNECTOR
1/4 IN.
PHONE
PLUG
BALANCED
WHITE
AUDIO +
PIN 2
TIP
GREEN
AUDIO -
PIN 3
RING
SHIELD
CHASSIS GROUND PIN 1
SLEEVE
46 mm
36.5 mm
4.7 mm
34.5 mm
10.3 mm
9.5 mm
9.1 mm
(23/64 IN.)
(3/8 IN.)
(1-13/16 IN.)
(1-7/16 IN.)
(3/16 IN.)
(1-23/64 IN.)
(13/32 IN.)
MOUNTING HOLES,
CLEARANCE FOR
No. 8 SCREWS
RED
BLACK
SHIELD
WHITE
RED
BLACK
YELLOW
GREEN
BUTTON MOVEMENT
CARTRIDGE
TRANSFORMER
SWITCH
CABLE
