Shure 527A User Guide

MODEL 527A

DYNAMIC COMMUNICATIONS MICROPHONE

The 527A microphone is an extremely reliable, high-im­pedance, 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 tre­mendous 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 “Mil­lion-Cycle” leaf-type switch is double-pole, single-throw, de­signed to withstand severe operating conditions and con­stant usage.

Model 527A User Guide

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 re­lay or switching circuit. The WHITE lead is the “hot” conduc­tor for connection to the microphone circuit; the shield is
connected to the microphone circuit ground. The micro­phone circuit of the switch is normally closed, but can easily
be modified for normally open operation.

9.1 mm

(23/64 IN.)

46 mm

(1-13/16 IN.)

36.5 mm

(1-7/16 IN.)

9.5 mm
(3/8 IN.)

4.7 mm

(3/16 IN.)

MOUNTING BRACKET

FIGURE 1

CARTRIDGE TRANSFORMER SWITCH

BUTTON MOVEMENT

MOUNTING HOLES,
CLEARANCE FOR
No. 8 SCREWS

(13/32 IN.)

34.5 mm

(1-23/64 IN.)

10.3 mm

CABLE

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

©2006, Shure Incorporated

27B2918 (Rev. 2)

INPUT TYPE

BALANCED

YELLOW

GREEN

RED

BLACK

BLACK

RED

SHIELD

WHITE

INTERNAL CONNECTIONS

FIGURE 2

WIRE

COLOR

WHITE AUDIO + PIN 2 TIP

GREEN AUDIO - PIN 3 RING

SHIELD CHASSIS GROUND PIN 1 SLEEVE

FUNCTION

XLR

CONNECTOR

1/4 IN.

PHONE

PLUG

CABLE TO CONNECTOR WIRING

Printed in U.S.A.

The microphone circuit of the 527A is normally closed
when the microphone switch button is in the normal position.
The microphone switch may be rewired to have a normally
open microphone circuit. To modify the 527A for a normally
open circuit, proceed as follows:

1. Remove the three No. 6 Phillips self-threading screws

from the back of the microphone case.

2. Separate the case front and back, then remove the

microphone switch button.

3. Unsolder or clip the WHITE cable lead and the RED

transformer lead from the switch solder lug (see
Figure 2).

4. Solder the WHITE cable lead and the RED transformer

lead to the lower switch solder lug.

5. Place the microphone switch button in the normal posi-

tion on the case front. Place the case back on the case
front and firmly press the two sections together. Fasten
the case back to the case front with the screws previ­ously removed.

Impedance (at 1,000 Hz)

21 kΩ minimum

Hum Sensitivity

30 ±5 dB equivalent SPL per 1 mOe

Switch

Double-pole, single-throw, leaf-type

Cable

Attached, 1.5 m (5 ft.), 3-conductor (1 shielded),

coiled-retractable, neoprene-jacketed

Dimensions

55.8 mm

(1-49/64 in)

93.7 mm

(3-11/16 in)

9.5 mm (3/8 in)

19.1 mm (3/4 in)

OPERATION

The 527A will operate satisfactorily under all ordinary con­ditions of humidity, heat, and cold. Dropping the microphone
or other severe mechanical shocks should be avoided.

SPECIFICATIONS
Type

Dynamic

Frequency Response

200 to 5,000 Hz

+20

+10

0

dB

–10

-20

20 200001000 1000050 100

9876543298765432

Hz

Output Level (at 1,000 Hz)

-15 ±4 dBV/100 μbars

0.8 mm (1/32 in)

1.6 mm (1/16 in)

66.7 mm
(2-5/8 in)

2.4 mm (3/32 in)

OVERALL DIMENSIONS

FIGURE 3

Net Weight

292 g

Certification

Conforms to European Union directives, eligible to bear
CE marking; meets European Union EMC Immunity Re­quirements (EN 50 082-1, 1992); RF radiated (IEC 801-3);
ESD (IEC 801-2); EFT (IEC 801-4).

FURNISHED ACCESSORY

Mounting Bracket (3 in kit) . . . . . . . . . . . . . . . RK6MB

REPLACEMENT PARTS

Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R131

Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RK319S

Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C12C

Transformer . . . . . . . . . . . . . . . . . . . . . . . . . 90A4319

For additional service or parts information, please contact
Shure's Service department at 1-847-600-8699. Outside the
United States, please contact your authorized Shure Ser­vice Center.

SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: [phone] U.S. Fax: [phone] Intl Fax: [phone]
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: [phone] Fax: [phone]
Asia, Pacific:
Shure Asia Limited, Phone: [phone] Fax: [phone]