Common Q Codes

[Radio Administrator]

The international Q codes are intended to be used to shorten sentences when working with CW and DXing. Each code can be used to convey a question, reply, request or statement. When used as a question or request for information, the code will be followed by a question mark.
Below, is a list of some of the common Q codes used in radio communications.

QRK - Readability of signal.
QRL - Busy.
QRM - Man made interference.
QRN - Natural interference such as static.
QRO - Increase power / High power.
QRP - Reduce power / Low power.
QRQ - Send faster / shall I send faster?
QRS - Send slower / shall I send slower?
QRT - Stop transmitting / close down.
QRX - Stand by.
QRZ - Who is calling?
QSA - What is my signal strength? / Your signal strength is...
QSB - Is my signal fading? / your signal is fading.
QSL - Confirm radio contact.
QSO - Contact, communication.
QSY - Shall I change frequency? / Change frequency.
QTH - Location.