How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?
Send your full call sign once or twice✓Richtige Antwort
Send only the last two letters of your call sign until you make contact
Send your full call sign and grid square
Send the call sign of the DX station three times, the words “this is,” then your call sign three times
Erklärung
In a pileup the DX operator needs your whole call sign to log you and needs the frequency back quickly, so send it once or twice and then listen. A partial call cannot be logged and only forces the operator to ask again, a grid square is not part of the exchange, and repeating the DX station's call is wasted time because the operator knows it.