I believe these are the current regs for the USA:? ? ?http://www.arrl.org/part-97-text
According to 97.305(c), emissions described in 97.307(f).3 can be used on HF below 10m,
Here is the text of 97.307(f).3:
"(3) Only a RTTY or data emission using a specified digital code listed in ¡ì97.309(a) of this part may be transmitted. The symbol rate must not exceed 300 bauds, or for frequency-shift keying, the frequency shift between mark and space must not exceed 1 kHz."
There have been attempts to change this, here's an effort by the ARRL in 2013:
The FCC responded with this proposed rule in 2016:
So far as I know, the regs have not changed.
But I have not been paying attention lately.
Jerry, KE7ER
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On Fri, Oct 15, 2021 at 10:29 AM, Jerry Gaffke wrote:
I believe section?97.307(f) of the FCC Rules still places a maximum symbol rate of 300 baud on emissions below 10 meters.
