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Typically the ARRL recommends using [[Ham Radio Q Codes]] in modes other than FM. The use of Q codes on a repeater or in FM simplex is really not necessary since the purpose of Q codes is to aide in conversation under noisy or less than ideal conditions. However, certain Q codes are widely recognized and are an abbreviated way to convey a longer message such that you will often hear operators use a very common Q code even on a repeater. For example, you might hear an operator say "I'm at the QTH" rather than saying "I am at my house or place of residence." No reasonable ham is going to be critical of their casual use on a repeater in regards to the most common examples.Typically the ARRL recommends using [[Ham Radio Q Codes]] in modes other than FM. The use of Q codes on a repeater or in FM simplex is really not necessary since the purpose of Q codes is to aide in conversation under noisy or less than ideal conditions. However, certain Q codes are widely recognized and are an abbreviated way to convey a longer message such that you will often hear operators use a very common Q code even on a repeater. For example, you might hear an operator say "I'm at the QTH" rather than saying "I am at my house or place of residence." No reasonable ham is going to be critical of their casual use on a repeater in regards to the most common examples. Just don't get carried away with them when operating FM voice.