In a previous life, I was a Post Office Telex/Telegraph/Teleprinter engineer for over 20 years from about 1969 and did maintenance, overhall and faulting of the Teleprinter 15 ( that was the BPO's designation for the Creed 444 -
15A for basic machine, 15B for machine with punched tape facility) amongst others ( Creed 11, 7B, 7E, 23. Transtell, Puma etc etc).I also passed my RAE in 1967 though was never licensed ( it was the Morse test for an 'A' licence that stumped me and 'B' licence UHF equipment was very expensive at the time for a youngster). Also, as a 16 yr old in 1967, other things, female in nature, distracted me for many years.
Once settled down and married, and when computers became affordable for the masses, I used to monitor RTTY ( mainly news agencies on HF ) using a Vic
20, a Sony short wave radio and a home built RTTY demodulator ( The Maplin one of the time ).News agency RTTY transmissions re the first Gulf war ( was that 1991 from memory ?? ) were indeed very interesting and it was especially interesting to see how they varied, considerably at times, from the output of the mainstream UK News channels at the time.
The phrase and header 'NOT FOR PUBLIC RELEASE' comes to mind.
Maybe they thought that their HF RTTY communications were private and no-one would be monitoring. I was and often - it became a bit of an obsession.
As well as the live screen display on the VIC 20, the RTTY feeds were fed to an old Transtell teleprompter that I had acquired on the second hand market for cheap.
My Vic 20 was a VERY self modified Vic 20 as, as standard, they don't have a printer interface.
In fact I still have that VIC 20 - saw it a few weeks ago, and the RTTY demod I built, unused for donkeys years, in the shed covered with years of dust.
Got a bit carried away reminiscing there - back to the subject ( almost ).
I thought that, from research at the time, someone had produced a gear set for the 444 to allow 45.5 baud working on 50 Hz mains supply.
Searched tonight and found this
There used to be, many years ago, The British Amateur Radio Teleprinter Group ( BART it was for short ), but they changed their name with the onset of things digital many years ago and I cant remember what they changed it to.
In fact I used to subscribe to the BARTG monthly magazine at the time ( I'm a hoarder of things technical and wouldn't be surprised if I still have them - somewhere ).
But I do nothing in this field today or for many years.
HTH