We have shared frequency bands with professionals for many years and have used 
a wide variety of modes of transmission. I see no need to make regulations to 
restrict the use of CW on MF.

Obviously, analogue speech is wasteful of bandwidth and should not be used in 
the new allocation.  Anyone who did so would be subject to strong social 
pressure from the amateur community (in other words, nobody would work them).

On the other hand, if you could fit a usable speech system in the gaps between 
the NDBs this would be something worth trying. It would be one of the things 
the amateur service is supposed to go in for – investigating new methods. 

I don't think the LF professionals ever investigated the majority of the 
digital modulation schemes we have recently used with such success on 136.  
They had plenty of real estate and the budget for high-power transmitters and 
did not need to.

John F5VLF