Shure 527C User manual

SHURE MODEL 527C
Transistorized Dynamic Hand-Held Microphone
The Shure Model 527C is a dynamic hand-held communica-
tions microphone designed for use in a variety of mobile and fixed-
station applications, including police, transportation, amateur radio
and similar applications. The 527C offers extremely low sensitivity
to hum pickup and low susceptibility to radio-frequency interfer-
ence. A built-in solid state amplifier permits the use of up to 30 m
(100 ft) of unshielded cable.
The modular construction of the 527C allows the cartridge,
switch, and cable to be replaced in a matter of minutes, if neces-
sary.The 527C fits naturally and comfortably in the hand and is not
adversely affected by heat or humidity. The 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
vibration.
FEATURES
• Built-in amplifier
• Frequency response from 300 to 5,000 Hz, tailored for voice
communications
• Low sensitivity to hum
• Low susceptibility to radio-frequency interference
• “Million-Cycle” leaf-type switch stands up under severe oper-
ating conditions and constant use
• High-impact ARMO-DUR

case — lighter and stronger than
die-cast metal, comfortable to the touch in hot or cold weather
• Rugged and dependable under all operating conditions
• Long-life neoprene-jacketed coil cord
CONNECTIONS
The internal wiring and switch connections of the 527C are
shown in Figure 1. A typical external operating circuit is shown in
Figure 2. Circuit parameters such as supply voltage, load, current
and sensitivity may be selected using the curves shown in Figures
3 and 4. If, for instance, the available supply voltage is 16 Vdc and
a current drain of 4 mA is desired, a load resistance (RL) of 2.2KΩ
is necessary. With a supply voltage of 16 Vdc and a load resistance
of 2.2KΩ, the relative sensitivity is approximately +8 dB, or –3 dB
output level referenced to the specified output level of –11 dB with
10 Vdc and a 470Ωload.
+GREEN
WHITE
BLACK
RED
BLACK
CARTRIDGE
SWITCH
CABLE
INTERNAL MICROPHONE CONNECTIONS
FIGURE 1
INPUT TYPE WIRE
COLOR FUNCTION XLR CONNECTOR 1/4 IN. PHONE
PLUG
BLACK AUDIO PIN 2 TIP
UNBALANCED RED AUDIO GROUND PIN 3 SLEEVE
SHIELD CHASSIS GROUND PIN 1 SLEEVE
BLACK AUDIO + PIN 2 TIP
BALANCED RED AUDIO – PIN 3 RING
SHIELD CHASSIS GROUND PIN 1 SLEEVE
CABLE-TO-CONNECTOR WIRING
TABLE 1
AUDIO
OUTPUT
TRANSMI
T
RELAY
CIRCUIT
LOAD RESISTANCE
RL
5 µF
RED (+)
AMPLIFIER
CARTRIDGE
MICROPHONE
BLACK (–)
GREEN
WHITE
SWITCH
+SUPPLY
VOLTAGE
VS
TYPICAL OPERATING CIRCUIT
FIGURE 2
Model 527C User Guide
27B2084 (AC)
2001, Shure Incorporated Printed in Mexico

SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE AND
LOAD RESISTANCE
FIGURE 3
SENSITIVITY AS A FUNCTION OF SUPPLY VOLTAGE AND LOAD
FIGURE 4
CAUTION: To avoid damage to the 527C, observe the following:
• Supply voltage (V) must be between 4 and 35 Vdc. Voltages
exceeding 35 Vdc may substantially reduce the life of the mi-
crophone. Voltages below 4 Vdc are not sufficient for micro-
phone amplifier operation (although no damage will occur).
• Do not exceed the maximum allowable current (dissipation
limit) for the various combinations of supply voltages and load
resistances.
• Maintain proper polarity for the red (+) and black (–) leads as
shown in Figures 1 and 2.
SPECIFICATIONS
Type
Dynamic (with transistor preamplifier)
Frequency Response
300 to 5,000 Hz (see Figure 5)
TYPICAL FREQUENCY RESPONSE
FIGURE 5
Sensitivity (at 1,000 Hz)
Open Circuit Voltage –31dBV/Pascal (28 mV). . . . . . . . . . . 1 Pascal = 94 dB SPL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load lmpedance Range
220 to 2,200 ohms (see Figures 3 and 4)
Maximum Signal (with 10 Vdc, 470Ωload)
135 dB SPL at 1,000 Hz produces +10 dBV (3.2V) at 10%
THD
DC Supply Voltage and Current
4 to 35 Vdc (see Figure 3)
Switch
Double-pole, single-throw, leaf-type
Cable
Non-detachable, 1.8 m (6 ft), 4-conductor, neoprene-
jacketed coil cord
Case
Black high-impact ARMO-DUR
Dimensions
See Figure 6
Net Weight
342 grams (12 oz)
Packaged Weight
483 grams (17 oz)
OVERALL MICROPHONE DIMENSIONS
FIGURE 6
MOUNTING BRACKET DIMENSIONS
FIGURE 7
FURNISHED ACCESSORY
Mounting Bracket* RK6MB. . . . . . . . . . . . . . . . . . . . . . . . . . .
*Three in replacement kit.
REPLACEMENT PARTS
Cartridge R132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Assembly RK319C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable C30C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
SHURE Incorporated Web Address: http://www.shure.com
222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A.
Phone: [phone] Fax: [phone]
In Europe, Phone: [phone] Fax: [phone]
In Asia, Phone: [phone] Fax: [phone]
Elsewhere, Phone: [phone] Fax: [phone]