[NLRS] Question on emission type

[Mike]

Hi all, I had a good time in the contest last week after I found the 
problem I was having.  Thanks.
I have a question though, I was reading the new ARRL petition for 
regulating by bandwidth not specific mode and there was something I 
don't understand.  It said that "(c) Pulse emissions are permitted on 
all bands authorized to the control operator above 902 MHz except in the 
23 cm and 3 cm bands."
First off what are pulse emissions and why wouldn't they be allowed on 
23 and 3 cm?  Would this have something to do with radar???

Thanks for your thoughts

Curious Mike

Kb0ozn