The Amateur Radio QSL card dates from the early days of radio when confirmation of the reception of a radio station’s broadcast, be it amateur, commerical or broadcast, became popular.
Origially the confirmation was either written out, or typed out as a formal letter, but as the volumn of requests increased the format was changed to s postcard with basic information provided.
The current size and format of the amateur radio QSL card is attributed to C.D.Hoffman 8UX of Akron Ohio, who in 1919 created a double sided card with his call sign on one side, and with call sign of the received station, frequency, date, time, etc. on the other.
This format was later standardized by the International Amateur Radio Union in terms with a size of 3.5 inches by 5.5 inches (90mm x 140mm) being adopted and remaining the standard used today.
Minimum information provided on the card should be as follows;
The call sign of the sending station
The call sign of the receiving station
Date and time of the QSO
Frequency and mode of transmission
The RS(T) that was sent and recieved
and any additional information or comments.
The front of the card normally presents the call sign of the station sending the QSL card in large, block letters, and there may be an optional background picture or illustration.
Here is an example of the front of a QSL card
Here is what the back looks like
And some have all of the information on the back, with the front used for addresses only.
There are many ways that you can create a QSL card. If you have access to graphic software programs (many of which are free such as paint.net for Windows) you can create your own.
Some people print out QSL cards on their injet printer, or have them printed at a print shop.
There are also on-line QSL card creation sites where you can design your own QSL card from existing templates or from scratch, and then have them printed and delivered to your QTH.
This is one of many that you can choose from, and the example given here is not an endorsement, just a starting point.