ptt over cellular mast

Radio Electromagnetic Spectrum

Radio electromagnetic spectrum refers to the range of frequencies of electromagnetic radiation that can be used for radio communication.

The spectrum is divided into several bands, each with different characteristics and uses.

Some examples of bands in the radio electromagnetic spectrum include:

Very Low Frequency (VLF): 3-30 kHz, used for communication with submarines

Low Frequency (LF): 30-300 kHz, used for navigation

Medium Frequency (MF): 300-3000 kHz, used for AM radio broadcasting

High Frequency (HF): 3-30 MHz, used for shortwave radio broadcasting and amateur radio

Very High Frequency (VHF): 30-300 MHz, used for television broadcasting, FM radio, and mobile communication.

Ultra High Frequency (UHF): 300-3000 MHz, used for television broadcasting, mobile communication, and satellite communication.

Super High Frequency (SHF): 3-30 GHz, used for microwave communication and radar.

It’s important to note that the use of frequency bands of the radio spectrum is regulated by governments and international organizations, such as the International Telecommunications Union (ITU), to avoid interference and optimise the use of these resources.

Walkie Talkie Antenna

VHF Walkie-talkies

You may have come across the term VHF in relation to walkie talkie hire, and wondered what it means.

VHF stands for Very High Frequency, and is the the frequency range between 30 Mhz (Megahertz) and 300 Mhz.

Choosing between VHF & UHF (Ultra High Frequency) is important when hiring two way radio walkie talkies because the ‘wavelength’ is inversely proportional to the frequency, which means that the higher UHF frequencies (300 – 3000 Mhz) have a shorter wavelength than VHF.  This means that the shorter UHF signals tend to be better suited to use in buildings and built up areas, because the ‘waves’ get around objects better.

Conversely, VHF tends to be a better solution for outdoor events, as the lower frequency normally allows greater signal range, which may be important.

For any help with hiring etc, contact Craig on 07905 025328, or use the contact form.