[GreenKeys] RTTY - High tones - Low tones?

[Nick England]

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?

Nick England K4NYW
www.navy-radio.com
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