wrote in message
...

So all that SO2R, or SO3R or SOxR does is make it
possible to change band/frequency really really fast.
It could be implemented with 1930s technology if
somebody really wanted to.

It is routinely implemented with no "technology" any more complex than SO1R,
unless you call split headphones a "technology". Pure and simple, it's a human
skill.

And it's nothing new either. The first generally accepted "serious" use of SO2R
was 56 years ago by W4KFC in the 1952 SS CW contest.

73, de Hans, K0HB
Just an old boy and his radios