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((Refimprove|date=December 2018))
'''Radio modems''' are [[modems]] that transfer data wirelessly across a range of up to tens of kilometres.
Using radio modems is a modern way to create Private Radio Networks (PRN). Private radio networks are used in critical industrial applications, when real-time data communication is needed. Radio modems enable users to be independent of telecommunication or satellite network operators. In most cases users use licensed frequencies either in the [[UHF]] or [[VHF]] bands. In certain areas licensed frequencies may be reserved for a given user, thus ensuring that there is less likelihood of radio interference from other [[RF transmitters]]. Also [[licence free frequencies]] are available in most countries, enabling easy implementation, but at the same time other users may use the same frequency, thus making it possible that a given frequency is blocked.
Typical users for radio modems are: [[Surveying|Land survey]] [[differential GPS]], [[fleet management]] applications, [[SCADA]] applications (utility distribution networks), [[automated meter reading]] (AMR), [[telemetry]] applications and many more. Since applications usually require high reliability of data transfer and very high uptime, radio performance plays a key role. Factors influencing radio performance are: [[Antenna (radio)|antenna]] height and type, the [[Sensitivity (electronics)|sensitivity]] of the radio, the output power of the radio and the complete system design.

==See also==
* [[Flow control (data)]]
* [[SATEL]]
* [[Racom]]

((Telecommunications))

==References==
((Reflist))

((DEFAULTSORT:Radio Modem))
[[Category:Wireless networking]]


((Telecommunications-stub))

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