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33 Cards in this Set
- Front
- Back
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External communications
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Request from public for both emergency and non-emergency
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internal communications
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Radio transmissions between units and individuals during emergency operations
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Public Safety answering point
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Place that takes all the emergency calls and routes call to fire, emergency medical, or law enforcement
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Emergency services specific telecommunication center
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Separate dispatch centers for fire police and EMS
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Enhanced 911
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Combined telephone and computer aided dispatch to provide instant information on location phone number and directions to the location .
Automatic location identification and GPS |
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Wired Telegraph circuit box
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Very reliable but only transmit location and not emergency information
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Base station radios
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Fixed non mobile radio at central location
Strongest |
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Mobile radios
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Mounted on fire trucks ambulances staff vehicles powered by vehicle electrical system medium strength
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Portable radios
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Handheld devices less powerful than fixed and mobile radios. Intrinsically safe
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AM
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Amplitude modulation
Varying strength of signal from speakers voice Medium wave signals |
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FM
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Frequency modulation signal change based on mic audio cancels natural noise
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Digital radios
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Improved audio quality and better use of assigned frequency. Digital transmitter converts voice to digital data
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Signal transmission
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Simplex radio system
Half duplex system Full duplex radio system |
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Simplex radio system
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When one radio transmits and another receives. Cannot receive and send a signal at the same time
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Half duplex system
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Series of repeaters to communicate between radios set at different frequencies. Frequency 1 will change to frequency 2 at repeaters
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Full duplex radio system
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Transmit and receive at the same time. Garbled communications. Just like a landline phone
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Conventional radio system
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1 frequency has only one use. Waste of resources. For example channel 1 can only be used for dispatch and nothing else
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Trunked radio systems
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Assigned transmissions to available frequencies. Hi bolen of traffic can be handled on multiple channels. Uses repeaters
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Dynamic regrouping
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Emergency alert feature that sends a signal to agency's dispatch center
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Who regulates radio communication
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FCC
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main limitations to radio transmissions
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distance, physical barriers, interference, ambient noise
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Radio signals travel how
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In a straight line. If messages are broken up indication the receiver is near limit of transmission range
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How to overcome physical barriers
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Turn body 90 degrees, with radio hire, raise the antenna up straight.
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Dead zones
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Loss of service or ability to transmit at a certain
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Ambient noise
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On an emergency scene this must be overcome and makes communication difficult
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Communication model
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The sender must Id themselves. The receiver must acknowledge message
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Microphone distance from mouth
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1 to 2 inches
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Place microphone against throat if you cannot be understood through SCBA facepiece
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Personnel accountability report
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Every supervisor must verify the status of those under their command and report it. Must be verbal or touch
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Limitation of par check
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Takes up a lot of radio time
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One should par cheque be taken
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Regular intervals every 15 minutes or for status changes on scene
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Post incident report
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Available to public and must be complete and written in clear text. It is a legal document
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National fire incident reporting system
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Data collection. All 50 states participate although not all fire departments participate
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