The Shure Model 577B microphone is a handheld dynamic microphone designed for communications and paging applications that require highly intelligible, low noise output. It can be used in all types of mobile communications, from amateur radio to helicopter news and traffic reports. It is also suitable for public address and paging systems in noisy areas such as factories, airport terminals, and restaurants.
The 577B microphone represents a significant improvement over most microphones with anti-noise features. Shaped frequency response, directionality, and distant sound discrimination contribute to total noise reduction. The microphone operates on the pressure-gradient principle and has two sound entry ports spaced a small distance apart.
The modular design of the 577B microphone greatly facilitates field servicing. The cartridge, switch, and cable can be replaced in a matter of minutes, if necessary. The 577B is built to withstand mechanical shocks, vibration, high temperatures, and humidity. The exclusive ARMO-DUR® case is impervious to oil, grease, fumes, salt spray, sun, and corrosion. The "Million-Cycle" press-to-talk switch ensures years of reliable service.
A mounting bracket is supplied to provide convenient hang-up when the microphone is not in use.
Note: For proper operation, mouth-to-microphone distance should be 1 inch (2.5 cm) or less.
| Frequency Response | 100 to 5,000 Hz |
|---|---|
| Impedance (at 1000 Hz) | Rated at 150 ohms (175 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms |
| Output Level (at 1,000 Hz, 5/16 in) | –66.0 dBV/Pa (0.5 mV) |
| Hum Sensitivity | Equivalent to 32 dB SPL in 1 millioersted field |
| Operating Temperature Range | –40 ohms to 74 ohms C (–40 ohms to 165 ohms F) |
| Switch Type | Double-pole, single-throw, leaf-type, push-to-talk |
| Cable | Non-detachable. 1.8m (6 ft), neoprene-jacketed coil cord, four conductor (two conductors shielded) |
| Case | Two-tone gray, high-impact ARMO-DUR |
| Furnished Accessories | RK6MB Cartridge |
| Weight | 0.72 lbs (330 g) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
