Shure 527C Operation & User’s Manual

©2005 Shure Incorporated 27C2084 (Rev. 5) Printed in U.S.A. Transistorized Dynamic Hand-Held Microphone The Shure Model 527C is a dynamic hand-held communica- tions microphone for use in a variety of mobile and fixed-station ap- plications, including police, transportation, amateur radio and similar applications. The 527C offers extremely low sensitivity to hum pickup and low susceptibility to radio-frequency interference. 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 min- utes, if necessary. 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 A typical external operating circuit is shown in Figure 1. 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 ref- erenced to the specified output level of –11 dB with 10 Vdc and a 470Ω load. CABLE-TO-CONNECTOR WIRING TABLE 1 TYPICAL OPERATING CIRCUIT FIGURE 1 CAUTION: To avoid damage to the 527C, observe the following: • Supply voltage (V) must be between 4 and 35 Vdc. Voltages ex- ceeding 35 Vdc may substantially reduce the life of the micro- phone. Voltages below 4 Vdc are not sufficient for microphone amplifier operation (although no damage will occur). • Do not exceed the maximum allowable current (dissipation lim- it) for the various combinations of supply voltages and load re- sistances. • Maintain proper polarity for the red (+) and black (–) leads as shown in Figure 1. WIRE COLOR FUNCTION BLACK AUDIO GROUND RED AUDIO GREEN RELAY CIRCUIT WHITE AUDIO OUTPUT TRANSMIT RELAY CIRCUIT LOAD RESISTANCE R L 5 F RED (+) AMPLIFIER CARTRIDGE MICROPHONE BLACK (–) GREEN WHITE SWITCH + SUPPLY VOLTAGE VS 5

Frequency Response 300 to 5,000 Hz (see Figure 2) Sensitivity (at 1,000 Hz) Open Circuit Voltage.......................... –31 dBV/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, 470Ω load) 135 dB SPL at 1,000 Hz produces +10 dBV (3.2 V) 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 5 Net Weight 342 grams (12 oz) Packaged Weight 483 grams (17 oz) FURNISHED ACCESSORY Mounting Bracket* ......................................... RK6MB *Three in replacement kit. REPLACEMENT PARTS Cartridge ............................................................... R132 Switch Assembly ............................................. RK319C Cable .....................................................................C30C For additional technical assistance, phone Shure at 1-847-600-8440. In Europe, phone 49-7131-72140. TYPICAL FREQUENCY RESPONSE FIGURE 2 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE AND LOAD RESISTANCE FIGURE 3 SENSITIVITY AS A FUNCTION OF SUPPLY VOLTAGE AND LOAD FIGURE 4 OVERALL MICROPHONE DIMENSIONS FIGURE 5 MOUNTING BRACKET DIMENSIONS FIGURE 6