Chapter 9 - ETC

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