The type of transmission, such as SSB (voice), CW (Morse code), or FT8 (digital).
To get the most utility out of your printed PDF files, consider the following organizational tips: ham radio logbook pdf
This is the most straightforward method. You can create a spreadsheet with all the desired column headers, define the page margins (typically 0.5 inches or less), and then print directly to a PDF printer. The W0DHZ template mentioned earlier is a prime example of what's possible with a spreadsheet. For more advanced users, you can even use the header/footer sections of your document to automatically add your callsign, grid square, and CQ zone to every page. The type of transmission, such as SSB (voice),