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
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
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
2001, Shure Incorporated
27B2084 (AC)
R
R
case — lighter and stronger than

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 2.2K
is necessary. With a supply voltage of 16 Vdc and a load resistance
Ω
of 2.2K , 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 470
CARTRIDGE
+
INTERNAL MICROPHONE CONNECTIONS
INPUT TYPE
UNBALANCED
BALANCED
case is
MICROPHONE
CARTRIDGE
RED (+)
AMPLIFIER
SWITCH
Model 527C User Guide
Ω
load.
SWITCH
BLACK
GREEN
WHITE
BLACK
RED
FIGURE 1
WIRE FUNCTION
COLOR CONNECTOR
BLACK AUDIO
RED AUDIO GROUND
SHIELD CHASSIS GROUND
BLACK AUDIO +
RED AUDIO –
SHIELD CHASSIS GROUND
CABLE-TO-CONNECTOR WIRING
TABLE 1
5 µF
LOAD RESISTANCE
+ SUPPLY
R
VOLTAGE
L
V
BLACK (–)
GREEN
WHITE
TYPICAL OPERATING CIRCUIT
FIGURE 2
Ω
CABLE
XLR 1/4 IN.
PHONE
PLUG
PIN 2 TIP
PIN 3 SLEEVE
PIN 1 SLEEVE
PIN 2 TIP
PIN 3 RING
PIN 1 SLEEVE
AUDIO
S
OUTPUT
TRANSMIT
RELAY
CIRCUIT
Printed in Mexico