QSL cards are like postcards that shortwave listeners send and receive to confirm reception of a signal from AM (such as CKUA 580AM) or FM radio, television or shortwave station. While QSL is one of the Q codes used in radio communication broadcasting, some people suggest it stands for Query Status Locator.

QSL Front

QSL Card: Front

QSL Card: Back

QSL Card: Back

Generally, the kinds of information on a QSL card include:

– your call sign
– your name and address
– the call of the station you contacted
– the date
– time in UTC
– frequency or band

Sources: Wikipedia and eHam.net