Microphones

Fireman’s Microphone

The Fireman’s Microphone Stations comprise a lockable wall mounting box housing a fist microphone and associated electronics. They will operate in an all-call mode even in the event of processor failure within the router.

The Fireman’s Microphone Stations comprise a lockable wall mounting box housing a fist microphone and associated electronics. They will operate in an all-call mode even in the event of processor failure within the router, as required by BS 5839 Pt 8.

Microphone audio is provided as a balanced 0dBu (nominal) analogue signal. An in-built signal limiting automatic gain control is provided to help compensate for varying operator technique. The microphone’s processor is responsible for generating an outgoing low-frequency surveillance tone which is used to monitor the audio connection to the VAR Router, while microphone capsule monitoring is performed by injection and monitoring of a signal such that either open or short circuit of the capsule or associated wiring will indicate a fault.

Certifications:
  • BS 5839
Document Title
File Size
Date Added
Image
SKU
Description
alt
VA-1365
Fireman’s Microphone: 18 to 40V DC: 90mA: Gooseneck: off-white with Black Annotation: 180x130x40m: 1kg: −5 to +50C
alt
VA-1364
Fireman’s Microphone: 18 to 40V DC: 70mA: Fist: Red RAL3020: 350x88.5x300 excluding handle: 5.7kg: −5 to +50C