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Abbreviations help to reduce the length of transmissions.
However, make it a rule not to abbreviate unnecessarily when working with an operator
of unknown experience.
| AA | All after | OB | Old boy |
| AB | All before | OM | Old man |
| ABT | About | OP-OPR | Operator |
| ADR | Address | OSC | Oscillator |
| AGN | Again | OT | Old timer; old top |
| ANT | Antenna | PBL | Preamble |
| BCI | Broadcast interference | PSE | Please |
| BCL | Broadcast listener | PWR | Power |
| BK | Break; break me; break in | PX | Press |
| BN | All between; been | R | Received as transmetted; are |
| B4 | Before | RAC | Rectified alternating current |
| C | Yes | RCD | Received |
| CFM | Confirm; I confirm | REF | Refer to; referring to; reference |
| CK | Check | RIG | Station equipment |
| CL | I am closing my station; call | RPT | Repeat; I repeat |
| CLD-CLG | Called; calling | RX, RCVR | Receiver |
| CUD | Could | SED | Said |
| CUL | See you later | SEZ | Says |
| CUM | Come | SIG | Signature; signal |
| CW | Continuous wave | SINE | Operator's personal initials or nickname |
| DLD-DLVD | Delivered | SKED | Schedule |
| DX | Distance, foreign countries | SRI | Sorry |
| ECO | Electron-coupled oscillator | SVC | Service; prefix to service message |
| ES | And, & | TFC | Traffic |
| FB | Fine business; excellent | TMW | Tomorrow |
| GA | Go ahead (or resume sending) | TNX-TKS | Thanks |
| GB | Good-by | TT | That |
| GBA | Give better address | TU | Thank you |
| GE | Good evening | TVI | Television interference |
| GG | Going | TVL | Television listener |
| GM | Good morning | TX | Transmitter |
| GN | Good night | TXT | Text |
| GND | Ground | UR-URS | Your; you're; yours |
| GP | Ground plane | VFO | Variable-frequency oscillator |
| GUD | Good | VY | Very |
| HI | The telegraphic laugh; high | WA | Word after |
| HR | Here; hear | WB | Word before |
| HV | Have | WD-WDS | Word; words |
| HW | How | WKD-WKG | Worked; working |
| LID | A poor operator | WL | Well; will |
| MA, MILS | Milliamperes | WUD | Would |
| MSG | Message; prefix to radiogram | WX | Weather |
| N | No | XMTR | Transmitter |
| ND | Nothing doing | XTAL | Crystal |
| NIL | Nothing; I have nothing for you | YF-XYL | Wife |
| NM | Nothing more | YL | Young lady |
| NR | Number | 73 | Best regards |
| NW | Now; I resume transmission | 88 | Love and kisses |
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