Martin Spott wrote: > Anders Gidenstam wrote: > >> On Tue, 13 Feb 2007, Holger Wirtz wrote: >> > > >>> What is the normal range for the Voice-COM-Equipment in a plane? >>> > > >> I'm no expert in this area but isn't most aviation radio communication in >> the VHF frequency range? I think VHF transmissions are mostly limited to >> line of sight unless something unusual is going on.. >> > > There's _always_ something usual going on - it's called "atmosphere" :-) > > As long as you're flying at several thousand feet over flat terrain > you're likely to be "in sight" of the station for quite some distance. > But even at good weather more than 60 nm - which I consider as a good > average for the given demand - is not very realistic, > > Martin. > Hi Range of radio comms, assuming Line-of-Sight path, is a function of transmitter power, aerial gain and distance. If you google path loss calculations you'll come up with several good references. If you assume 25w transmitter power (IIRC is 17dBW), 3dB transmitter aerial gain and 0dB receive (aircraft) aerial gain and plug those into the formula then you'll get a reasonable figure... this ignores such "atmospheric" phenomonen as rain attenuation, ducting etc.
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