Could I ask you to explain this in terms a ham would understand? --- In digitalradio@yahoogroups.com, "iv3nwv" <nico...@...> wrote: > > In a message oriented and power limited fading communication system what > counts is the relationship between the channel coherence time (the time > interval over which the channel response can be considered almost constant) > and the message duration.
By channel coherence time do you mean time when the signal is readable? > If the message duration is not much longer than the channel coherence time > there's no other possibility than to exploit frequency diversity. I can see how this would work using widely separated frequencies. However we have all observed that when a signal goes down in QSB, it does down right across the passband. So do you actually gain anything by spreading the transmission by only 2.2kHz, other than the ability to annoy people who consider it a selfish waste of bandwidth? Julian, G4ILO
