I'm attempting to get a Robot 800 TU going. The manual (circa 1981) says Low Tones (1275/1445) are used for HF and High Tones (2125/2295) are used for VHF. "Return to factory" if you want to change....

Now I'm a newbie when it comes to RTTY, but I really would like to know if there was ever a time when people agreed to one standard and stuck with it for more than 6 months?