Codes and Alphabets
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Q-Code
These codes were oringinally developed to shorten transmission times when using CW, but are frequently used in voice transmissions eg. I and going to go QRT, thanks for the QSO.
More information abut the history and usage of Q-codes can be found here.
| Code | Meaning | Sample use |
|---|---|---|
| QRG | Exact frequency | HE TX ON QRG 14205 kHz |
| QRI | Tone (T in the RST code) | UR QRI IS 9 |
| QRK | Intelligibility (R in the RST code) | UR QRK IS 5 |
| QRL | This frequency is busy. | Used almost exclusively with morse code, usually before transmitting on a new frequency |
| QRM | Man-made interference | ANOTHER QSO UP 2 kHz CAUSING LOT OF QRM |
| QRN | Natural interference, e.g. static crashes | BAND NOISY TODAY LOT OF QRN |
| QRO | Increase power | NEED QRO WHEN PROP POOR |
| QRP | decrease power | QRP TO 5 W |
| QRQ | Send faster | TIME SHORT PSE QRQ |
| QRR | temporarily unavailable/away, please wait | WILL BE QRR 30 MIN = THAT STN IS QRR NW |
| QRRR | Distress | Distress call recommended by ARRL |
| QRS | Send slower | PSE QRS NEW TO CW |
| QRT | Stop sending | ENJOYED TALKING 2 U = MUST QRT FER DINNER NW |
| QRU | Have you anything for me? | QRU? ABOUT TO QRT |
| QRV | I am ready | WL U BE QRV IN UPCOMING CONTEST? |
| QRX | will call you again | QRX @ 1500H |
| QRZ | You are being called by ________. | QRZ? UR VY WEAK (Only someone who has previously called should reply) |
| QSA | Signal strength | UR QSA IS 5 |
| QSB | Fading of signal | THERE IS QSB ON UR SIG |
| QSD | Your keying is defective | QSD CK YR TX |
| QSK | Break-in | I CAN HR U DURING MY SIGS PSE QSK |
| QSL | I Acknowledge receipt | QSL UR LAST TX = PSE QSL VIA BURO (i.e. please send me a card confirming this contact). |
| QSM | Repeat last message | QRM DROWNED UR LAST MSG OUT = PSE QSM |
| QSN | I heard you | QSN YESTERDAY ON 7005 kHz |
| QSO | A conversation | TNX QSO 73 |
| QSP | Relay | PSE QSP THIS MSG TO MY FRIEND |
| QST | General call to all stations | QST: QRG ALLOCS HV CHGD |
| QSX | I am listening on ... frequency | QSX 14200 TO 14210 kHz |
| QSY | Shift to transmit on ... | LETS QSY UP 5 kHz |
| QTA | Disregard last message | QTA, DID NOT MEAN THAT |
| QTC | Traffic | STN WID EMRG QTC PSE GA |
| QTH | Location | QTH IS SOUTH PARK CO |
| QTR | Exact time | QTR IS 2000 Z |
RST code
| Number | R - Readability | S - Strength | T - Tone | |
|---|---|---|---|---|
| 1 | Unreadable | Faint signal, barely perceptible | Sixty cycle a.c or less, very rough and broad | |
| 2 | Barely readable, occasional words distinguishable | Very Weak | Very rough a.c., very harsh and broad | |
| 3 | Readable with considerable difficulty | Weak | Rough a.c. tone, rectified but not filtered | |
| 4 | Readable with practically no difficulty | Fair | Rough note, some trace of filteringfrequency | |
| 5 | Perfectly readable | Fairly Good | Filtered rectified a.c. but strongly ripple-modulated | |
| 6 | not used | Good | Filtered tone, definite trace of ripple modulation | |
| 7 | not used | Moderately Strong | Near pure tone, trace of ripple modulation | |
| 8 | not used | Strong | Near perfect tone, slight trace of modulation | |
| 9 | not used | Very strong signals | Perfect tone, no trace of ripple or modulation of any kind |
RSV code for SSTV transmissions
| Number | R - Readability | S - Strength | V - Video | |
|---|---|---|---|---|
| 1 | Unreadable | Faint signal, barely perceptible | Picture unreadable | |
| 2 | Barely readable | Very Weak | picture barely visible | |
| 3 | Readable with difficulty | Weak | Readable with flaws | |
| 4 | Readable with no difficulty | Fair | Very good picture some flaws | |
| 5 | Perfectly readable | Fairly Good | Perfect picture no flaws | |
| 6 | not used | Good | not used | |
| 7 | not used | Moderately Strong | not used | |
| 8 | not used | Strong | not used | |
| 9 | not used | Very strong signals | not used |