--- In digitalradio@yahoogroups.com, Rick W <[EMAIL PROTECTED]> wrote: > > Looking at the mode as a QAM constellation with several speeds, if using > an SSB transmitter and sending an image (fax) and excluding the > bandwidth part, for HF using an SSB suppressed carrier with a quantized > or digital signal with sub carrier and sending facsimile it would likely > be J2C? > > And for VHF, and I assume you mean FM, which gives the much larger > bandwidth, FM angle modulation sending a quantized or digital signal > with sub carrier and sending facsimile or F2C? Or with a phase modulator > using the G symbol as you suggest? > > If sending Data instead of image, then the third symbol changes from C > (fax) to D (data) except that I am not sure if F2D is considered to be > Data here in the U.S. as it does not seem to be listed as one of the FCC > approved ITU emission classifications for "data." > > The multi-channel second symbol selection of 7 may only be for much more > complicated multi streams not normally used on amateur equipment. > > Maybe others have more knowledge of this? > > 73, > > Rick, KV9U >
Thank you for the reply Rick It is not easy don't you think? What puzzle me are the several data carriers that I see on the waterfall. Not considering the bandwidth we can omit the first part For the first could be anything (type of modulation of the main carrier) like J, F, G, or even in special cases M, K and Q. Now the hard part, the second numeral. (nature of signal(s) modulating the main carrier) No modulating signal 0 FALSE A single channel containing quantized or digital information without the use of a modulating sub-carrier 1 FALSE A single channel containing quantized or digital information with the use of a modulating sub-carrier 2 MAYBE A single channel containing analogue information 3 FALSE Two or more channels containing quantized or digital information 7 DON'T KNOW Two or more channels containing analogue information 8 FALSE Composite system with one or more channels containing quantized or digital information, together with one or more channels containing analogue information 8 MAY BE (because we are also using the waterfall pictures in analog, and files in digital) Now the third letter (type of information to be transmitted) No information transmitted N FALSE Telegraphy - for aural reception A FALSE Telegraphy - for automatic reception B FALSE Facsimile C FALSE we are transmitting files (wav,txt,and so on) Data transmission, telemetry, telecommand D MAY BE Telephony (including sound broadcasting) E FALSE Television (video) F FALSE Combination of the above W FALSE This is only for the first 3 letters missing the others two letters for additional information Any help or comments ?? Rui, CT1QK
