IDAS dPMR radios only use 6.25kHz per channel. In general, the narrower the channel, the better the sensitivity becomes, and longer communication ranges can be obtained. Where installation conditions allow, FDMA systems can deploy two repeater sites using two 6.25kHz channels to increase the communication coverage in total, but still only using 6.25kHz spectrum. The spectrum efficiency of FDMA is maintained in direct peer-to-peer communication at 6.25kHz, where competing TDMA systems require infrastructure to achieve the same efficiency.
When comparing digital with analogue FM, the audio quality of analogue FM gradually deteriorates with static noise as the distance increases. On the other hand, IDAS dPMR digital audio provides static noise free, stable audio for longer until the fringes of the communication range.
IDAS dPMR radios have built-in CTCSS/DTCS, 5-Tone and BIIS 1200 signaling and are designed to coexist with analogue radio systems. IDAS dPMR radios can receive both analogue and digital mode signals on a single channel. When receiving an analogue call on a channel set to "Mixed-digital", the analogue talk back function allows you to reply to the call in the analogue mode.
IDAS dPMR radios allow you to call individual or group users. The way of call set-up is similar to the analogue BIIS 1200 system. Analogue users can introduce IDAS dPMR without hesitation and avoid a new learning curve with these radios.
Using digital modulation, the IDAS dPMR radio cannot be easily monitored with an analogue receiver. When secure communication is required, the IDAS system provides a built-in digital voice scrambler using a 15-bit key (about 32,000 codes).
IDAS dPMR radios provide status call, short data messages and GPS position data with voice communication. When IDAS dPMR radios are connected to a PC or other external equipment, the IDAS dPMR transparent data mode provides up to 3,600 bps data communication in a 6.25kHz channel.
An IDAS dPMR IP network can extend your communication coverage and allows you to communicate like a single site. It lets you connect dispersed sites or different bands over the IP network. In a building all the way from the basement to the top floor, radio communication can be covered using already deployed LAN cables.
With the optional UC-FR5000 (#12), up to 16 IDAS repeaters can be interlinked with each other. An IDAS terminal radio user can communicate with other IDAS terminal radio users using the interlinked repeater sites on the network.
* The IDAS conventional IP network cannot relay voice traffic over the IP network if the uplink is analogue.
The IDAS dPMR IP network requires only the UC-FR5000 (#12) network controller which can be installed into the IC-FR5100 series repeater – no control server and no extra rack space is required. In addition, the repeater and network controller settings can be remotely maintained and monitored over an IP connected PC.
By using the AMBE+2™ vocoder compression, an IDAS dPMR IP network requires only about 13kbps bandwidth per one voice path in theory. It means a DSL class line is sufficient for the IDAS dPMR IP network in terms of the Internet connection speed. A fixed IP address is required for each networked repeater.
