WorksheetsChapter 9 - ETC
Total questions: 12
Worksheet time: 6mins
Radio waves are low energy because their wavelengths are very short.
True
False
In terms of radio signals, frequency is:
the interval of time between the broadcasting of a signal and the receipt of the signal.
the highest energy electromagnetic waves.
the number of times a radio signal is broadcast.
the number of electromagnetic waves that pass a given point in one second.
Frequency band (or bandwidth) is:
measured in hertz (Hz)
measured in kilowatts (kW)
the widest point in a radio wave
a measure of wave thickness
A transmitter antenna is required to receive radio signals.
True
False
Radio repeaters allow signals to travel farther while maintaining their strength and clarity.
True
False
A tuner is used to “tune into” a specific bandwidth signal. Each tuning point is commonly called:
a repeater
a channel
an electromagnetic wave
a transmission
Which of the radio bands has virtually no skip interference?
HF (High Frequency) shortwave band (between 3 and 30 MHz)
VHF (Very High Frequency) low band (25-50 MHz and 72-76 MHz)
VHF (Very High Frequency) high band (150-174 MHz)
UHF (Ultra High Frequency) 450-512 MHz
Portable radios (walkie talkies) are transceivers.
True
False
Interagency communications and interoperability tend to be inefficient and ineffective:
without standardized cross-agency rules and procedures for radio use
without the most expensive radio equipment currently available
when all involved agencies use an agree upon system of communication
when information is broadcast in short segments with breaks between them
With trunked radio, a large group of user share:
radio communication codes
mobile radio equipment
a single radio frequency channel
a relatively small pool of radio frequency channels
Cognitive radio is also called “smart” radio.
True
False
The report of specific suspect information over the radio immediately following a law enforcement/police incident is commonly referred to as:
an interoperability broadcast
a BOLO
the UHF report
the NATO alphabet
