Q-code · CW operating
QRM in Morse code
Specifically man-made interference: other stations, electrical noise from devices, switched-mode PSUs.
Morse rendering
--.- .-. --
QRM sent as a normal three-letter group (inter-letter gaps included).
As a question
QRM? — Is there man-made interference on my signal?
As an answer
QRM — There is man-made interference (QRM).
When this is used
Contrast with QRN (natural noise). A common QRM report is 'QRM 599' meaning you're being interfered with at strength 9. Numeric severity 1–5 is sometimes appended: QRM3 = moderate.
Examples
| On the air | Plain English |
|---|---|
| QRM? | Am I being interfered with? |
| QRM | Yes, there's man-made QRM. |
| QRM5 QSY | Severe interference; let's change frequency. |
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