Common and Important Examples
- N0N
- Continuous, unmodulated carrier - as previously commonly used for radio direction finding (RDF) in marine and aeronautical navigation.
- A1A
- Signalling by keying the carrier directly (aka CW or OOK) - as currently used in amateur radio. This is often but not necessarily Morse code.
- A2A
- Signalling by keying a tone modulated onto a carrier so that it can easily be heard using an ordinary AM receiver - as used for station idents of some NDB transmissions. This is usually but not exclusively Morse code. (An example of modulated continuous wave)
- A3E
- AM speech communication - as used for aeronautical VHF communications
- F3E
- FM speech communication - as used for marine and many other VHF communications
- J3E
- SSB speech communication - as used on HF bands by marine, aeronautical and amateur users
- A3E or A3EG
- Normal AM broadcast - as found on public LF and MF bands
- F1B
- FSK telegraphy, such as RTTY.
- F1C
- HF Radiofax
- F2D
- Data transmission by frequency modulation of a radio frequency carrier with an audio frequency FSK subcarrier. Often called AFSK/FM.
- J2B
- PSK31 (BPSK31)
- F8E or F8EH
- Normal FM stereo broadcast - as found on public VHF band, and as the audio component of broadcast television transmissions
- C3F or C3FN
- Broadcast analogue television video signals (previously identified as A5C under the 1976 Radio Regulations)
Note that there is some overlap, so a signal might legitimately be described by two or more designators. In such cases, there is often a traditionally preferred designator.
Read more about this topic: J3E
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