John, The direct printing could also refer to the older technologies of printing to a TD couldn't it? It would be possible to then relay that information without actually printing it out, such as on a sheet of paper with a teleprinter or on a monitor screen? Or would that become data?
It is my view that the ITU designators make distinctions where there really should be no distinctions. On your second paragraph, I have to admit that it is one of those "sleeper" items in Part 973(b): /(3) Image/. Facsimile and television emissions having designators with A, C, D, F, G, H, J or R as the first symbol; 1, 2 or 3 as the second symbol; C or F as the third symbol; and emissions having B as the first symbol; 7, 8 or 9 as the second symbol; W as the third symbol. However, these "B" modes sound as if they need separate sidebands from the voice channel. It would be interesting to get a reading from the FCC on what these modes are in practical terms. After all, if you can transmit on one sideband with voice and another with darn near anything, analog or quantized, what is wrong with just transmitting on one SB with voice and switching to data or image? Can anyone explain this? Maybe an oversight on the part of the FCC? 73, Rick, KV9U John B. Stephensen wrote: >The key appears to be whether the information is printed immediately or not. >In 97.3, RTTY is defined as "Narrow-band direct-printing telegraphy." So text >is B if it is printed or D if it is not printed. > >It's interesting that emission types B7W, B8W and B9W (ISB) are still allowed, >so you can legally transmit data anywhere that image transmission is allowed >if it is accompanied by analog or digital voice or image transmission or even >by CW or RTTY. > >73, > >John >KD6OZH > > >
