When selecting a CW transmitting frequency, what minimum separation from other stations should be used to minimize interference to stations on adjacent frequencies?

CW (Continuous Wave, or Morse code) is a very narrow bandwidth mode, typically requiring only about 150 Hz of actual bandwidth. To prevent your transmitted signal from interfering with adjacent CW QSOs, a minimum separation of 150 Hz to 500 Hz is generally considered good amateur practice. If you space yourself too closely (like 5 to 50 Hz), your signals will overlap and create a confusing, simultaneous tone for the receiving station. Conversely, leaving 1 kHz to 3 kHz of separation is unnecessary for CW. Doing so wastes valuable spectrum space that could easily accommodate several other CW operators.