All that really matters is the shift (170 Hz) and rate (45 bps/60WPM, or 75bps/100WPM). The radio takes care of the rest, so you can use the ptich that you prefer.
I've heard lots of stories about why the 2125/2295 Hz tone pair was used. Some of the stroies make sesne, but I haven't taken the time to research and satisfy myself about the "why" so I won't speculate here. In the early days of packet on HF, we picked 1700 Hz as the center frequency because tyapical radios of the day with "CW" IF filters put the center of the passband there when used in SSB mode. The four pitch selections we provide in the K3 are based on defaults in programs like MMTTY. To tune RTTY, you want both indicatrors to be of similar width in the CWT. If it still doesn't decode, then go to the opposite sideband, but that shouldn't be necessary. Practice onthe W1AW RTTY bulletins. Those transmissions are long enough to allow you to practice tuning. Many RTTY "CQ" transmissions are too short to tune in, especially during contests! 73, Lyle KK7P > Lyle, re RTTY, the manual and K3 operating tips are not very clear to me as > why there are different RTTY pitch frequencies. When I was last on HF, 2125 > was the MARK freq. What is the advantage of choosing a MARK tone other than > 2125? > > Here is where I'm stuck on decoding RTTY... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
