Shure SM82 User Guide

THE SOUND OF THE PROFESSIONALS

®

PROFESSIONAL PRODUCTS

The Model SM82-LC is a hand-held, self-contained,
unidirectional, condenser microphone containing its
own line level amplifier, peak limiter, and battery. It is
designed to provide a line level output for use in a varie­ty of broadcasting situations where a line level
microphone with a built-in limiter is required.

Microphone Features:

n

Wide range frequency response for exceptionally
clean and natural sound reproduction

n

Cardioid polar pattern, uniform with frequency and
symmetrical about axis, to provide maximum rejec­tion and minimum coloration of off-axis sound

n Balanced line level output can directly drive

telephone lines or other line level inputs

n

Built-in peak limiter controls output level to prevent
microphone line amplifier or external equipment
overloading

n

Internal 9.8V battery operation

n

Phantom powering over a 15V to 50V range

n Automatic switchover from phantom to battery

power

n

Solid-state line level amplifier output

n

Built-in “pop” and wind filter protects against wind
and explosive breath sounds

n n

Unidirectional condenser transducer

n

Output connector/switch turns microphone on when
cable connector is inserted

n n

Rugged construction for outstanding reliability

n n Can be used over wide range of operating

temperatures and humidity conditions

n

Very low mechanical handling noise

The Model SM82 was designed to fill the need for a
rugged, reliable line level microphone for broadcast ap­plications. Intensive laboratory development and
testing in major broadcast studios and remote pickup
sites complemented the field-derived specifications
and features, resulting in an optimum design to meet a
variety of broadcast needs.

The exceptional performance and unique features of
the SM82 make it an outstanding choice for such ap­plications as:

n

Single-Channel Remotes-without separate remote

amplifier.

n

“Dialed-Up” Telephone Reports - internal resistance
holds “dialed-up” line.

n n

Long-Run Microphone Lines for Parades, Political
Events, Golf Tournaments or Other Live
Remotes - using unshielded cable.

n

Sports Announcing-limiter prevents overloading of
remote broadcast amplifier.

The SM82 is supplied with an accessory foam wind­screen, swivel adapter, and mercury battery.

SPECIFICATIONS

Type

Cardioid condenser with line level amplifier and
limiter

Frequency Response

40 to 15,000 Hz (see Figure 1)

Polar Pattern

Cardioid (unidirectional) response-uniform with fre­quency, symmetrical about axis (see Figure 2)

Output Impedance

250 ohms actual (designed for use with 600-ohm or

greater loads)

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Copyright 1986, Shure Brothers Inc.

27A1103 (FD)

Printed in U.S.A.

U.S. Patents 4,000,370 and D239,722

POLAR PATTERNS

FIGURE 2

Output Level

Open circuit voltage: -23 dBV

(1000 Hz response)

(0.11V) for 74 dB

SPL (0 dBV = 1 volt)
Power output:

-4 dBm into 600 ohms for 94 dB
SPL
(0 dBm = 1 mW in 600 ohms)

Limiter

Threshold:

+ 6 dBm (approx. 104 dB SPL) (Figure 3)

Attack time: Typically 5 msec for 10 dB input
change

Release time: Typically 330 msec for 10 dB input

change

Range: 20 dB

Output clipping level:

+ 10 dBm

Total Harmonic Distortion (1000 Hz response at +4
dBm output level)

1% or less (below limiting)

Hum Sensitivity

Less than -125 dBm in 1 millioersted field

(ref: Power Output specification)

Output Noise

Equivalent to 37.5 dB SPL with weighting per DIN

45405

Phasing

Positive pressure produces positive voltage on pin 2

with respect to pin 3

LIMITER THRESHOLD

FIGURE 3

Storage Temperature:

Up to 74°C (165° F) without

appreciable change in performance

Microphone Overload and Shorting Protection

Shorting: Shorting output (even for prolonged
periods) will produce no damage, but may shorten
battery life

Maximum external voltage applied to pins 2 and 3

with respect to pin 1: 22V

Maximum external voltage applied between pins 2

and 3: 44V

Connector

Professional three-pin audio connector* with built-in

on-off switch (depressing pin 1 turns microphone on)

Case

Stainless steel housing, brass and brazed steel grille

Case Finish

Bronze vinyl enamel with dull chrome grille screen

Dimensions

See Figure 4

Power

Battery:

Type:

9.8V Mercury (Duracell TR177 or

equivalent)
Average Life: 90 hours

Minimum Voltage: 8.5 Vdc

Current Drain (typical): 2.5 mA (idle); 8 mA max.
(full signal)

Phantom Voltage: See Figure 5

Current Drain (typical): 16 mA

Operating Conditions

Temperature:

- 12° to 57°C (10° to 135°F) (battery
operation); -23° to 57°C (- 10° to 135°F) (external
supply operation)

Relative humidity: 5 to 98% over temperature
ranges specified above

OVERALL DIMENSIONS

FIGURE 4

Net Weight

406 grams (14.4 oz) with battery

Shipping Weight

834 grams (29.4 oz)

*Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) series

or equivalent connector.

2