JDK
QRM was one of life's great pains if you were trying to make CW communications at long range with some piece of Air Ministry 'wireless' technology such as the 1154/55!!
Interference, static, general rubbish or another station transmitting on your frequency could all qualify.
The code, incidentally in its basic form was a statement i.e. ...
QRM - I am being interfered with.
The interrogative form was QRM IMI - the IMI being written with a superimposed bar and sent as one continuous character.
Nostalgia isn't what it used to be
