The Basics and Tech of Public Safety Radio

The Basics and Tech of Public Safety Radio

May 11, 2020

Technology is developing with each new day, and that includes public safety communications. The communications systems given to public safety personnel seem to be getting more complicated, while the workers are still expected to figure out how to use each new system.

However, with all these changes, it’s easy to forget that the basics matter. Without a knowledge of the basics, there’s no way for these professionals to learn the newest tech on the market.

1. Understanding of the Equipment

Every kind of wireless communication technology transmits radio waves to communicate. These waves send data and sound through the air, invisibly.
These waves need both a receiver and a transmitter to be used for communication. Although each part of the equipment has its own technical terms, the basics are that something needs to send the information and something needs to take it in and translate it.
The transmitter side of the equation takes a message, which can be in the form of voice, text, a picture, or something else. Then, it encodes that message in the form of a wave. The message is encoded using frequency modulation.
Next, the wave is transmitted to the receiver, where it is decoded. Each side uses an antenna to accomplish this. Antennae are simple metal rods that can catch and send waves.

2. Frequency and Bandwidth Knowledge

Waves have a characteristic known as their frequency. “Frequency” measures how many times a wave moves up and down in one second.
The higher the frequency, the shorter the wavelength. On the electromagnetic spectrum, the radio frequency part is sometimes called the “radio spectrum.” The spectrum is a chart that tells you which parts of the spectrum, known as “bands,” every wireless technology can be transmitted on.
Every type of wireless communication has a band: TV channels, AM/FM radios, and even cell phone providers. The amount of space the frequency takes is called its bandwidth.

3. Digital or Analog

Cell phones and TV now use entirely digital waves, rather than analog ones. Most police and public service communications use a mix of digital and analog.
Analog waves send electrical signals that change in intensity and use modulation. However, these waves can easily be interrupted by outside factors, like storms.
Environmental disturbances are much less likely to interrupt a digital wave. However, if one of these waves is interrupted, all the content is lost, and not even a partial message will get through.
Background noise can also disrupt digital waves, so a lot of professionals still believe analog waves are better for public safety radio. However, many companies are researching digital wave technology and developing new ways to make it better. Someday, that technology will result in clean, clear communications every time.

4. Narrow or Wide Band

The radio spectrum has limited room, which means that the frequencies sent have to be regulated so they’re efficient and won’t interfere with other signals.
With narrow-banding, the same frequency can be used for more radios without interference. However, the data speed goes down as more radios are added to the frequency.

The Importance of Public Safety Radio

Firefighters, EMTs, and other public safety workers use radios to communicate their needs and handle situations and disasters.
With a good understanding of the technology, these workers can do their jobs better. As new improvements to the tech come along, a solid understanding of the basics helps those improvements make sense.



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