Shure 550L Bedienungsanleitung

Model 550L User Guide

Shure Brothers Incorporated

222 Hartrey Avenue

Evanston IL 60202-3696 U.S.A.

27A8090 (RB)

E1998, Shure Brothers Incorporated Printed in U.S.A.

MODEL 550L

OMNIDIRECTIONAL DYNAMIC

BASE STATION MICROPHONE

The Shure 550L is a dynamic base station micro-

phone with a frequency response specially tailored for

voice intelligibility. It is equally useful for radio commu-

nications, paging and dispatching systems, and its

low-impedanceconnectionmakesitadaptabletomost

PA amplifiers. The low-impedance design also makes

itusefulforlongruns,orunderseverehumdisturbance

conditions.

Themicrophoneisnotaffectedbyheatorhumidity.

Its exclusive ARMO-DURRcase is immune to oil,

grease, fumes, salt spray, sun, rust, and corrosion

—and is outstanding in its ability to resist mechanical

shocks and vibration. The “Million-Cycle” leaf-type

switch is designed to withstand rigorous operating

conditions and constant use.

Features

•

Low-impedance operation for long cable runs or

severe hum disturbance

•

Crisp, natural, high-intelligibility voice response

•

Fingertip control bar actuates microphone circuit

and external relay or control circuit

•

Long-life switch meets rigorous requirements of

communications and paging systems

•

Sturdy, high-impact ARMO-DUR base and micro-

phone case—impervious to corrosion

•

Reliability plus—under all operating conditions

•

Neoprene feet prevent microphone slipping

PRESS-TO-TALK SWITCH OPERATION

The fingertip control bar is a non-locking switch;

simply depress the control bar and release after trans-

mission.

CONNECTIONS

Figure 1 shows the internal wiring of the 550L

microphone. The 550L is designed for balanced-line,

low-impedance operation. The WHITE and GREEN

cableleads arethe twoconductors forthe microphone

circuit; the shield is connected to the amplifier or chas-

sis ground. The RED and BLACK leads control an ex-

ternal relay or switching circuit.

RED

ORANGE

RED

BLACK

WHITE

GREEN

SHIELD

TRANSMIT

INTERNAL CONNECTIONS

FIGURE 1

Low-impedance operation is extremely useful

wherelongcable lengthsarerequired, or undercondi-

tions of severe hum disturbance. The permissible

cable length is practically unlimited, since neither re-

sponse nor level is appreciably affected. Shure A95

Series Line Matching Transformers are available for

use in those cases where a low-impedance micro-

phone is to be used with an amplifier with a high-

impedanceinput.Thesetransformersprovideaproper

impedance match between a 19- to 300-ohm micro-

phone and a high-impedance input, and are available

with various input and output connectors.

SPECIFICATIONS

Type

Dynamic

Frequency Response

150 to 6,000 Hz (see Figure 2)

TYPICAL FREQUENCY RESPONSE

FIGURE 2

Polar Pattern

Omnidirectional

Impedance (at 1,000 Hz)

Microphone rating impedance is 150 ohms (220

ohms actual) for connection to microphone in-

puts rated at 75 to 300 ohms

Output Level (at 1,000 Hz)

Open Circuit Voltage* –74.0 dB (0.2mV)

. . . . . . . .

Power Level** –53.5 dB. . . . . . . . . . . . . . . . . . . . . . . .

*0 dB = 1 volt per microbar

**0 dB = 1 milliwatt per 10 microbars

Switch

Press-to-Talk Switch actuates microphone circuit

and external relay or control circuit. Microphone

circuit normally open.

Cable

2.1m (7 ft) four-conductor, two conductor

shielded, non-detachable

Case

Brown ARMO-DURRwith dull chrome-plated

steel screen

Dimensions

See Figure 3

OVERALL DIMENSIONS

FIGURE 3

Net Weight

836 grams (1 lb 13-1/2 oz)

Shipping Weight

1.12 kilograms (2 lb 7-1/2 oz)

REPLACEMENT PARTS

Cartridge R50

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cable C32C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch RK321S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

For additional service or parts information, please

contact Shure’s Service Department at 1–800–

516–2525. Outside the United States, please contact

your authorized Shure Service Center.

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