On Wed, Feb 15, 2017 at 11:29 PM, Tony Duell <ard.p850...@gmail.com> wrote:
> I think at one time radio amateurs (at least over here) had to use 5 bit > ITA2 > machines for RTTY. Same here. > It may even be to this day that RTTY implies that, and > that ASCII is classed as 'data'. The FCC order authorizing Amateur Radio use of ASCII went into effect in March of 1980, but at the moment I can't track down a copy of the actual order. The current FCC regs (§97.309) are more recent, and lump RTTY and "data emission" together, allowing ITA2, AMTOR, or ASCII, or, with additional limitations, "an unspecified digital code". I suppose I could use EBCDIC, FIELDATA, or the IBM Stretch character code, as long as I didn't use it for the purpose of obscuring the meaning of the communications, or to communicate with a station in a country with which the US doesn't have an agreement allowing those codes to be used. But the 5 level machines that were used over > here tend to be Creeds (Creed 7s, 75s and 444s mostly). > I'm told that Teletype models 15, 19, and 28 were very common here. I've mostly seen models 15 and 28. I've only once seen a mdoel 32 (ITA2 five-level version of model 33). I've seen some Kleinschmidt teleprinters, but I've never seen a Creed.