PAS recently completed work on a new pool and leisure centre successfully installing public address and intercom systems.
Contracted to a NHS Trust, PAS have recently supplied access control and CCTV systems to a busy hospital and clinic site.
PAS have recently completed the supply and installation of a large emergency PA system to a very busy and highly occupied local authority headquarters in the City of London.
577B Fist microphone
The 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.
Type Dynamic, noise-cancelling
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.) Open Circuit Voltage ... -66.0 dBV/Pa (0.5 mV) 0 dB = 1 volt per 1 Pascal/94 dB SPL
Hum Sensitivity Equivalent to 32 dB SPL in 1 millioersted field
Operating Temperature Range -40 degrees to 74 degrees C (-40 degrees to 165 degrees 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®
Dimensions See User Guide
Net Weight 330 grams (11.6 oz)