Shure Microphone 577b User Manual

Model 577B User Guide  
NOISE-CANCELING HANDHELD DYNAMIC MICROPHONE  
OPERATION  
For optimum performance and maximum rejection of background noise,  
place your upper lip against the lip guard, approximately 25 mm (1 in.)  
from the grille. Hold down the push-to-talk button while talking normally.  
INTERNAL CONNECTIONS  
The 577B is a balanced-line, low-impedance dynamic microphone. It is  
designed for direct connection to low-impedance microphone inputs and/  
or installations where long cable lengths are needed. It includes a four-  
conductor (two conductors shielded) coiled-cord cable and a double-pole,  
single-throw, leaf-type switch. The WHITE and GREEN leads are the “hot”  
audio conductors; the shield is connected to microphone circuit ground. The  
RED and BLACK leads control the switch circuit. The microphone circuit  
is open when the switch is open, but can be easily modified for normally  
shorted operation. Refer to Figure 1.  
WHITE  
GENERAL  
The Shure Model 577B SONOBAR® Microphone is a handheld dynamic  
microphone designed for communications and paging applications that  
require highly intelligible, low noise output. It can be used in all types of  
mobile communications, from amateur radio to helicopter news and traffic  
reports. It is also suitable for public address and paging systems in noisy  
areas such as factories, airport terminals, and restaurants.  
The 577B represents a significant improvement over most microphones  
with anti-noise features. Shaped frequency response, directionality,  
and distant sound discrimination contribute to total noise reduction. The  
microphone operates on the pressure-gradient principle and has two sound  
entry ports spaced a small distance apart.  
INTERNAL CONNECTIONS  
FIGURE 1  
TABLE 1. CABLE-TO-CONNECTOR WIRING  
The modular design of the 577B greatly facilitates field servicing. The  
cartridge, switch, and cable can be replaced in a matter of minutes, if  
necessary.  
INPUT TYPE  
WIRE  
FUNCTION  
XLR  
1/4 IN.  
PHONE  
PLUG  
COLOR  
CONNECTOR  
The 577B is built to withstand mechanical shocks, vibration, high  
temperatures, and humidity. The exclusive ARMO-DUR® case is impervious  
to oil, grease, fumes, salt spray, sun, and corrosion. he “Million-Cycle”  
press-to-talk switch ensures years of reliable service.  
WHITE  
GREEN  
SHIELD  
AUDIO+  
AUDIO –  
PIN 2  
PIN 3  
PIN 1  
TIP  
RING  
BALANCED  
CHASSIS  
GROUND  
SLEEVE  
A mounting bracket is supplied to provide convenient hang-up when the  
microphone is not in use.  
WHITE  
AUDIO  
--  
--  
TIP  
GREEN  
AUDIO  
SLEEVE  
GROUND  
Features  
UNBALANCED  
SHIELD  
CHASSIS  
GROUND  
--  
SLEEVE  
Frequency response tailored for close-talk operation  
Extremely effective noise cancellation  
Dynamic microphone cartridge  
Modular design  
“Million-cycle” leaf-type press-to-talk switch  
TRIPLE-FLEX® cable provides three to four times the flex life of  
most coiled cords  
Rugged ARMO-DUR® case  
Built-in hang-up button and supplied mounting bracket  
27C1128 (Rev. 5)  
©2013 Shure Incorporated  
Printed in U.S.A.  
 

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