ICOM radio guides

What are the differences between VHF and UHF?

ICOM two-way radios are available in VHF and in UHF with different frequency bands:

  • VHF radios operate on the 136-174 MHz band
  • UHF radios on the 400-470 MHz band (NXDN technology, dPMR standard)
In material terms, VHF and UHF radios are almost identical, only the antennas have a slightly different length, with VHF antennas being larger than UHF antennas.

Nevertheless, VHF and UHF radios have different advantages and the type of radio you need depends on your situation.

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  • Your use is mainly indoor:
In general, UHF radios are better suited for indoor use because their wavelength is shorter and allows for better penetration into steel and concrete elements.
Inside, VHF radio signals tend to degrade more than UHF signals.
UHF radios are also particularly suitable for use inside buildings such as shopping malls, office buildings, underground car parks...
UHF radios will therefore be more suitable in cities and areas with high urbanization.

  • Your use is mainly outdoor:
VHF radios are best suited for outdoor use on open sites with direct visibility. They are perfect for rural areas, on open ground, hilly landscapes,... VHF radios will therefore be more suitable outside cities and rural areas.

  • Your use is indoor AND outdoor:
In the case of a site with buildings and exteriors to be covered, or extended sites with obstacles or reinforced concrete (basement, floors,...), it is advisable to use radios on the UHF band.


However, depending on the specificities of the site, our technicians study on site the most suitable solution to guarantee you reliable and quality communications adapted to the uses and characteristics of your business.



How to improve lone worker security?

Employers' safety responsabilities

As an employers you are responsible for ensuring the security of your workers and have to "takes the necessary measures to ensure the safety and protect the physical and mental health of workers” (article L. 4121-1 of theFrench Labour Code).

In the event of an accident, isolation of your workers remains a factor that intensify the damage, which is still too underestimated in terms of prevention. The protection of a single worker includes all prevention/intervention measures and procedures designed to meet this obligation.

The mission of an isolated worker alarm device (DATI) is to transmit an alarm corresponding to a situation considered critical by an isolated worker to a person or structure responsible for triggering.
Sensors are integrated in the DATI to detect loss of verticality, lack of movement…
The alarm message may contain information on the position of the isolated worker (GPS coordinates, beacons...) to facilitate emergency response.

The use of the DATI is of course done in a strict framework by following a simple procedure of emergency organization specific to each company, tested and validated.

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Benefits of two-way radio solutions

A two-way radio solution is considered as a device that ensures the protection of the lone worker or the employee that can be in distress situation due to the nature of its position: night work, staggered working hours, working at height...

ICOM two-way radios for Lone Worker and Man Down solutions offers an Isolated Worker Alarm System (DATI function) that allows an isolated worker to transmit an alarm corresponding to a critical situation or an accident to someone responsible for triggering emergency assistance or to a dedicated structure.

ICOM France offers a wide range of transceivers to trigger the alarm manually and/or automatically:

  • manually by the isolated worker (dedicated alert button)
  • automatically thanks to the sensors of loss of verticality, absence of movement, tearing off of the DATI....