Designed for communication systems — mobile and fixed station — including police, fire, utilities, transportation, commercial, and industrial applications. Suitable for environments with high levels of background noise.

Note: For proper operation, mouth-to-microphone distance should be 1 inch (2.5 cm) or less.

Application

Paging

Intercom

Two-Way Radio

Microphone Type

Dynamic:

Simple, rugged diaphragm/coil. handles extreme volume levels without distortion.

Polar Pattern

Cardioid:

Picks up the most sound in front of the microphone and some from the sides. Less susceptible to feedback in high volume environments.

Frequency Response

Tailored:

Smooth, extended response. Tuned to accentuate specific types of instruments or voices.

Form Factor

Handheld

Model Line

Other

Downloads
577B User Guide (PDF)
Features
  • Frequency response designed for voice communications
  • Directional mic element
  • Minimal pick-up of background noise due to close-talk design
  • Rugged, high impact ARMO-DUR® case
  • Double-pole, single-throw PTT switch designed for constant usage
  • Four conductor, shielded, bare-ended (no connector) coil cord
  • Does not require DC power for operation
  • Mounting bracket included
Specifications
Type
Dynamic, noise-canceling
Frequency Response
100 to 5,000 Hz
lmpedance
Rated at 150 ohms (175 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms.
Output Level
Open Circuit Voltage: -66.0 dBV/Pa* (0.5 mV) *0 dB = 1 volt per 1 Pascal/94 dB SPL
Accessories
Name Availability
R98B

R98B

Replacement Cartridge for 577B Microphone.