Nothing is altered. In a SSB transmitter, amplitudes are scaled (usually UP) and frequencies just shifted. So, if audio tones change frequency, RF tones do likewise.
73, Jose, CO2JA --- El 22/02/2010 18:04, John escribió: > So as to not continue growing the ROS legality discussion even further, I > would like to ask a fairly simple question. > > How will the modulation be determined from any SSB transmitter when the > source of the modulation is via the microphone audio input of that > transmitter? > > Simply stated, how would any digital mode create anything other than some > form of FSK simply by inputting a tone at the microphone input? > > Regardless of the software being used to generate the tone(s), at any given > time there is nothing more than the absence or presence of a tone at the > audio input of the transmitter. This is true of HRD's DM780, MixW modes, > MMSSTV, or many other sound card driven software packages. They all have one > thing in common, they generate a sequence of tones which is then processed by > the very same transmitter in the very same way. The maximum output bandwidth > is supposed to be somewhat limited in the bandpass of the transmitter > circuitry (which is NOT being altered). Again, NO transmitter circuitry is > being altered in any way that I am aware of. > > With this discussion, how do we arbitrarily change the transmitter output > definitions? I am truly asking because that is a concept beyond my feeble > mind. I really do not know. To me, regardless of the "source" of the > modulation itself, the modulation still remains an offset of the carrier > frequency by the frequency of the input tone. > > To me, the discussion of particular FCC designators for any of these modes is > rather moot, unless there is some method to tie the two together. To simply > start an argument about a particular FCC rule, without showing the > correlation to the subject is somewhat like arguing the color of orange peels > in an apple pie instruction sheet. They simply don't necessarily relate. Both > may have valid points about their own arguments, but the tow simply do not go > together. > > Am I missing something besides a few marbles now? My head is spinning from > all these rules being bandied about, that may have no application here at all. > > John > KE5HAM > >
