DX is a general term for communication with a distant station, usually meaning overseas.
They are asking if there is any interference.
In amateur radio, when someone asks what your QTH is, they are asking for your position, usually in latitude and longitude.
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 means to see if you can communicate direct or by relay with someone.
It's a general call that an operator would make on a frequency to invite listeners to respond to.
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.
RTTY is a digital communication form to send characters over the radio, known as radioteletype. Similar to FAX.
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.
"Roger that" is a slang, usually used in radio transmissions such as military communications, meaning "I understand" or "I hear you." When someone says "Roger that" it mean he has understood what is being said.
Who is it who says "on" on heart