Q-codes are easy to look up and hard to actually use. A reference table tells you that QTH means location — it doesn't tell you that QTH? and QTH BOSTON are the same code doing two opposite jobs, or that sending QRL? before you call is the difference between a polite operator and one everybody groans at.
This page is the examples. A full contact, annotated line by line, then the codes you'll genuinely hear and how they're used in practice. For the plain definitions, the Q-code reference has all of them.
The one rule that makes Q-codes click
Every Q-code is both a question and an answer. Add a question mark and it asks; leave it off and it tells.
| Sent as | Means |
|---|---|
| QTH? | Where are you? |
| QTH BOSTON | I'm in Boston. |
| QRS? | Shall I send slower? |
| QRS | Send slower. |
| QSL? | Can you confirm you received that? |
| QSL | Confirmed, I got it. |
Get that one distinction and roughly half the confusion disappears. It's also the mistake that most marks out a new operator: sending QRZ when you meant QRZ? tells the band you're calling someone rather than asking who called you.
A real QSO, line by line
Here's an ordinary short contact. Nothing exotic — this is what most CW exchanges actually look like.
| Sent | What it means |
|---|---|
| QRL? | "Is this frequency in use?" Always send this before calling on a clear-sounding frequency. Someone may be there and you simply can't hear them. |
| CQ CQ CQ DE W1ABC W1ABC K | A general call. DE is "from", K is "over to you". |
| W1ABC DE K2XYZ K | K2XYZ answers, naming who they're calling first. |
| K2XYZ DE W1ABC = UR RST 579 = QTH BOSTON MA = NAME JIM = HW? K | Signal report, location, name, then "how do you copy?" The = is the BT prosign, used as a separator. |
| W1ABC DE K2XYZ = QSL = UR RST 559 = QTH DENVER CO = NAME SUE = QRM HR = K | "Got all that." Report back, and a note that there's interference here. |
| K2XYZ DE W1ABC = QSL = TNX QSO SUE = 73 = SK | Acknowledged, thanks for the contact, best regards, end of contact. |
Six lines, and only five Q-codes in the whole thing: QRL, QTH, QSL, QRM and QSO. That's typical. Q-codes are seasoning, not the meal — the bulk of a contact is call signs, signal reports and plain CW abbreviations.
The ten you'll actually hear
| Code | In practice | Typical use |
|---|---|---|
| QRL? | Is this frequency in use? | Before every call. Non-negotiable courtesy. |
| QTH | Location | QTH DENVER CO |
| QSL | Received / confirmed | QSL to acknowledge; also means a confirmation card. |
| QRZ? | Who is calling me? | When you catch a call but not the sign. |
| QRS | Send slower | QRS PSE — the most useful code a learner can send. |
| QRM | Man-made interference | Another station, a heterodyne, electrical noise. |
| QRN | Atmospheric noise | Lightning static. Not the same as QRM. |
| QSB | Fading | QSB HR — your signal is rising and falling. |
| QSY | Change frequency | QSY 7030 |
| QRT | Closing down | QRT — I'm going off the air. |
Two pairs are worth keeping straight because they sound similar and mean different things. QRM is interference a human caused; QRN is noise the sky caused. QRS asks for slower; QRQ asks for faster — and QRP (low power) is not a speed code at all, it's a whole style of operating.
Q-codes, abbreviations and prosigns aren't the same thing
Three different systems get lumped together, and knowing which is which makes a transcript far easier to read:
- Q-codes — three letters starting with Q, each a question or an answer. QTH, QSL. Full list.
- Abbreviations — shorthand for ordinary words. TNX (thanks), OM (old man), HW? (how do you copy?), 73 (best regards).
- Prosigns — run-together letters that punctuate rather than spell. AR (end of message), BT (paragraph break, written =), SK (end of contact).
In the QSO above, QSL is a Q-code, TNX and 73 are abbreviations, and = and SK are prosigns. All three in one line is completely normal.
Three mistakes worth avoiding
- Calling without sending QRL? first. The station you can't hear can usually hear you.
- Using the question form when you mean the answer. QSL? asks; QSL confirms.
- Over-seasoning. Stacking six Q-codes into one line reads as showing off and is harder to copy. Real operators use a handful.
Practice them before you transmit
The fastest way to get comfortable is to hear these at speed rather than read them. Drop any of the exchanges above into the translator to hear the rhythm, or generate endless realistic exchanges — call signs, reports, Q-codes and all — with the random CW generator. When you can copy a full QSO without pausing, you're ready for the real thing; calling CQ walks through your first contact end to end.