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:
nWide range frequency response for exceptionally clean and natural sound reproduction
nCardioid polar pattern, uniform with frequency and symmetrical about axis, to provide maximum rejection and minimum coloration of off-axis sound
nBalanced line level output can directly drive telephone lines or other line level inputs
nBuilt-in peak limiter controls output level to prevent microphone line amplifier or external equipment overloading
nInternal 9.8V battery operation
nPhantom powering over a 15V to 50V range
nAutomatic switchover from phantom to battery power
nSolid-state line level amplifier output
nBuilt-in “pop” and wind filter protects against wind and explosive breath sounds
n Unidirectional condenser transducer
nOutput connector/switch turns microphone on when cable connector is inserted
Copyright 1986, Shure Brothers Inc.
27A1103 (FD)
nRugged construction for outstanding reliability
nCan be used over wide range of operating temperatures and humidity conditions
nVery 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:
nSingle-Channel Remotes-without separate remote amplifier.
n“Dialed-Up” Telephone Reports - internal resistance holds “dialed-up” line.
nLong-Run Microphone Lines for Parades, Political Events, Golf Tournaments or Other Live Remotes - using unshielded cable.
nSports 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
Printed in U.S.A.
U.S. Patents 4,000,370 and D239,722
|
POLAR PATTERNS |
|
FIGURE 2 |
Output Level (1000 Hz response) |
|
Open circuit |
voltage: -23 dBV (0.11V) for 74 dB |
SPL (0 dBV = 1 volt) |
|
Power output: |
-4 dBm into 600 ohms for 94 dB |
S P L |
|
(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
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
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
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