Digital Radio

COM.EL Radiotelecommunications offers the best digital radio devices on the market. Digital DMR (Digital Mobile Radio) technology offers many operational advantages when compared to analog. The digital systems we offer allow the following main special functions:

  • Private and encrypted calls (it is possible to communicate between two radios without the rest of the radio park being able to listen - in general no radio which doesn’t belong to the park, although set on the same frequency, can hear your communications)
  • Management of separate and simultaneous communication groups,which in certain circumstances may intercommunicate with each other
  • Sending free-dial text messages (SMS) or pre-coded messages between the radios
  • Possibility to locate portable radios in open (GPS) or indoor environments and to perform an "access control" (with the supply and installation of Beacon radios in the internal areas of the building) on ​​a special SW of Centro
  • Management of zones, messages, calls, recording of communications, historical archives, etc. with the appropriate SW of Centro
  • Possibility to interface the radio system to the telephone, so that portable radios can receive and make calls to and from mobile phones and landlines
  • Possibility to use bluetooth accessories (eg earphones / microphones)

Other function solutions available:

Radio park management: the Centre SW, in addition to acting as a fixed radio, can manage all calls and communication groups; can record them, can send and receive messages, locate all the radios on maps, define the boundaries of radio relevance and activate any "trespassing" alarms; can perform access control and expand to features developed in the future.

Aumento Gruppi di Comunicazione e Link Ponti: independent communication groups can be increased by increasing bridges in the same site; this feature is very useful, especially in terms of data transmission (location) and telephone calls private / not, since there is the possibility of making private calls or simultaneous locations without causing problems to the voice communication group.
It is also possible to connect multiple bridges in IP at different sites; in this way a sort of semi-synchronous radio network is created, which allows operators to operate on a single channel, simultaneously activating multiple repeat bridges, thus increasing global radio coverage as well.

È altresì possibile collegare più ponti in IP in diversi siti; così facendo si crea una sorta di rete radio semisincrona che dà la possibilità agli operatori di operare su un canale unico attivando contemporaneamente più ponti ripetitori, aumentando così anche la copertura radio globale.

Rescue request alarm: you can send a manual emergency assistance alarm to the Centre by pressing the particular button located on the portable radios. The Centre, on recieving this alarm, can give the following information:

  • Description of the type of alarm in progress (request for assistance)
  • Indication of the ID of the radio in alarm (number or user name)
  • Map display of the GPS position of the radio in question (if under GPS coverage) or also of the indoor area in which it is located (with indoor location system / access control)

GPS location: on the Centre’s map, the positions of the different radios are displayed; the position data is transmitted via radio and can be automatic, timed or even obtained at the request of the Centre.

Telephone interfaces: you can interface the repeater bridge or the centre SW to a telephone switchboard (or to a GSM / GPRS / UMTS telephone module) and make sure that the radios can receive and make telephone calls to and from landlines and telephones mobile phones.
The radios are not equipped with SIM cards, so you do not have to pay telephone fees on portable radios, which are seen as a sort of cordless appendage.
The telephone voice on the radio side is spread by the bridge that turns it in the switchboard: you can then make and receive telephone calls with the radios, even in the absence of a telephone field, since the field is provided by the radio repeater bridge.
The radio-side user will speak in half duplex using PTT, the phone-side user will speak in full duplex, as in a normal radio conversation.

Access control: you can have feedback on the access / pass centre SW that the portable radios perform in different areas through an optional card that can be placed inside the radios and Beacons (access points) installed in the various zones. Beacons can offer a wide range coverage (max 25 metres) or a minimum radius (min 0.5 metres - for access control).
Once a radio approaches a Beacon, it is automatically "docked" and automatically sends its ID and its passage or position to the Centre, all without the operators needing to take any action (both at the Centre and those supplied with portable devices).

"Man on the ground" alarm: a card with tilt sensor can be inserted into the portable radios. This sensor can be set to detect a certain angle of inclination A (settable) for a programmable time T. Once a handset is in this condition (AxT) it emits a pre-alarm sound to warn the user that if the normal inclination is not re-established within N seconds (set time), the radio will automatically send an alarm to the Centre. The alarm received from the Centre will indicate:

  • The type of alarm in progress (man on the ground)
  • The ID of the radio in alarm (number or name)
  • It will display on a map, the GPS position of the radio in question
  • If there is an indoor location / access control system, it will indicate in which area / area / access the radio is in alarm

Job Ticketing: this is a function that allows sending a list containing the work to be done to each radio; it can then be acknowledged when the work is finished.

Azienda Comel Prodotti Radiotelecomunicazioni Parma

Operation in Analog Mode

Many digital radio devices can also operate in analog mode, they are in fact DMR analog-digital bimodal devices. When they are used in analog mode, they behave like any analog radio and therefore it is possible to combine a mixed park composed of radio devices of different brands and models.

If, instead, they are used in analogical mode, they operate like any analog radio; all the functions previously described are peculiarities of a system used totally in digital mode.

Thanks to this bimodality of operation (which is active on both mobile / portable radios and repeater bridges) it is possible to manage a migration from an existing analog radio park to a new digital DMR without creating interruptions and ensuring continuity of operation, integrating the new equipment into the existing radio park, and then combining two different types of equipment.

This can also make it possible to spread the economic investment over a longer period of time.

COM.EL offers various types of analogical equipment depending on the customer's needs:

  • Radio operating on professional civil bands (use restricted by the release of a regular grant of use by the Ministry)
  • Radio for data transfer / telemetry
  • ATEX radio and accessories
  • Radio operating on Amateur Radio bands
  • dPMR446 radio (digital for "free" use)
  • Accessories

Below are the main analog radio brands we deal with.

Do not hesitate to contact us for more information on these products.