RTTY is a digital communication form to send characters over the radio, known as radioteletype. Similar to FAX.
In amateur radio, when someone asks what your QTH is, they are asking for your position, usually in latitude and longitude.
They are asking if there is any interference.
'K' is the prosign for 'over.'
It is used in ham radio terms as a term for the wife of the ham operator.
They are asking if you acknowledge receipt or that they acknowledged receipt.
It's a general call that an operator would make on a frequency to invite listeners to respond to.
It means to see if you can communicate direct or by relay with someone.
listening in to a conversation without participating in it. 73-Chris/N3GAD
73 is an accepted term to indicate signing off or end of transmission.
DX is a general term for communication with a distant station, usually meaning overseas.
It means radio operations that are done as a hobby, or in the use of public service. Operators cannot (by law) earn money or material reward in any way, for the use of the radio. When we say Amateur radio/ Ham Radio these all sound same. There is very few authentic info about Amateur or HAM names, but i have read from very authentic version "radiosguide". They explain all the philosophy of amateur radio origin.
It means to change to a different frequency. For example, some will use a repeater to make initial communication and then QSY to a different frequency for direct communication.