--- In digitalradio@yahoogroups.com, "John" <ke5h...@...> wrote: > > Thanks Skip, > > Unfortunately, this really does not get to the crux of my question(s). I > understand how an SSB transmitter works, but that is not really what I am > after. > > What I am driving at is if like this. If I use DM780 to run some version of > digital mode via an SSB transceiver, it uses a tone or series of tone > modulation/shifting to create the output of the transmitter, and not one > single mode is called "spread spectrum" output, but is called FSK or PSK, > etc. Now, we get into the aforementioned discussion regarding ROS, and > suddenly, still via the microphone input of the same transmitter, those > shifted frequencies are now called "spread spectrum" instead. I am having a > great deal of difficulty understanding, other than the author happened to > call his scheme "spread spectrum" in his technical documentation. >
That's a good question. If we run RTTY with 850 Hz shift like we did in the old days, has that turned into spread spectrum?
