From the earliest days of radio, amateur radio operators have chosen to make a written confirmation of a contact with another amateur by mail. After all, a century ago, there were few other options. In the early days, a radio contact of even 100 miles was a feat worth remembering and having proof that you made it. Radio operators used a group of three letters to signify that the contact was completed, sending "QSL" via Morse code. This would then be followed with a paper postcard being sent via mail to the other amateur. The card would confirm all of the relevant details of the contact, such as time, frequency, signal strength, location, etc. Most cards would also include the type of equipment that the operator was using along with the amount of power being used.
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