The 527B microphone is an extremely reliable handheld dynamic microphone with an extended low- and high-frequency response particularly suited to ham radio use, mobile FM transmission, and top-quality paging systems. The microphone has a clear, crisp, and natural voice response. It features small size, light weight, and modular construction. The modular construction of the 527B permits ease of field serviceability. The design of the cartridge, switch, and cable makes them easily replaceable. The microphone is wired to prevent lead breakage or crimping. The unit fits naturally and comfortably in the hand and is not affected by heat or humidity. The exclusive 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 vibrations. The “Million-Cycle” leaf-type switch is designed to withstand severe operating conditions and constant usage.
Extended low- and high-frequency response
Highly intelligible voice response
Unparalleled ruggedness and reliability
Moving coil (dynamic) element
"Million-Cycle" leaf-type switch controlling microphone and external relay or switching circuits
Modular construction for easy field service
"Lifetime" hang-up button and mounting bracket
Long-life neoprene-jacketed coil cord
The 527B microphone is highly recommended for all types of mobile communications, ham radios, industrial and commercial paging systems, and outdoor public address systems. The 527B is a low-impedance microphone and is recommended where long cable lengths are required.
A quick release mounting bracket for permanent installation is supplied with each microphone. The bracket has mounting holes with clearance for No. 6 or No. 8 screws
The 527B has a four-conductor, coiled cord cable and a double-pole, single-throw, leaf-type switch to control the microphone circuit and an external relay or switching circuit. The WHITE and GREEN leads are the audio conductors for balanced-line connection to the microphone circuit; the shield is connected to the microphone circuit ground.
The 527B will operate satisfactorily under all ordinary conditions of humidity, heat, and cold. Dropping the microphone or other severe mechanical shocks should be avoided.
Frequency Response: 300 to 5,000 Hz
Sensitivity (at 1,000 Hz)
Impedance: Microphone impedance rating is 150 ? (200 ? actual) for connection to microphone inputs rated at 19 to 300 ?
Switch: Double-pole, single-throw, leaf-type
Cable: Attached, 1.8 m (6 ft), 4-conductor (2 shielded), neoprene-jacketed
Net Weight: 337 g (11.9 oz)
Packaged Weight: 533 g (18.8 oz)
Certification: Meets European Union EMC Emissions and Immunity Requirements (EN 50081-1: 1992, EN 50082-1: 1992).
- Open Circuit Voltage: -53 dBV/Pa (2.2 mV)*1 Pascal=94 dB SPL