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.
(23/64 IN.) 9.1 mm MOUNTING HOLES, CLEARANCE FOR No. 8 SCREWS
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 ARMO-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. FEATURES � Extended low- and high-frequency response � Highly intelligible voice response � Unparalleled ruggedness and reliability � Moving coil (dynamic) element � ARMO-DUR case �
46 mm (1-13/16 IN.) 36.5 mm (1-7/16 IN.)
10.3 mm (13/32 IN.)
9.5 mm (3/8 IN.)
4.7 mm (3/16 IN.)
34.5 mm (1-23/64 IN.)
MOUNTING BRACKET FIGURE 1
CARTRIDGE TRANSFORMER BUTTON MOVEMENT SWITCH CABLE
YELLOW
RED BLACK RED
GREEN
BLACK
WHITE
SHIELD
�Million-Cycle� leaf-type switch controlling
INTERNAL CONNECTIONS FIGURE 2
WIRE COLOR WHITE GREEN SHIELD XLR CONNECTOR PIN 2 PIN 3 1/4 IN. PHONE PLUG TIP RING SLEEVE
� � �
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
INPUT TYPE
FUNCTION AUDIO + AUDIO -
BALANCED
CHASSIS GROUND PIN 1
CABLE TO CONNECTOR WIRING
©2006, Shure Incorporated 27B2918 (Rev. 2)
Printed in U.S.A.
