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Classes of radio emission
- this page is a stub
In the past, the type of modulation of a transmitter or receiver,
was specified as an abbreviation, such as AM for
Amplitude Modulation, or FM for Frequency modulation.
In the late 1970s, the designators for all modulation types were standardised
by the International Telecommunication Union (ITU), resulting in a
complex scheme of confusing identifiers that changed over time [1].
The new designators follow a scheme that has been agreed by the telecom
authorities of most countries, and cover even the most complex modern
digital modulation types. Confusingly however, it does not
discriminate between Lower Side Band (LSB) and Upper Side Band (USB),
which is why many radio amateurs and professionals are still using the
original (legacy) designators. 1
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LSB and
USB are both covered by J3E (formerly A3J), the designator
for Single Side Band (SSB) with suppressed carrier.
➤ Wikipedia
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Below is a non-exhaustive overview of radio frequency (RF)
modulation types that are used with
some of the equipment described on this website. The list
may be expanded in the future and
suggestions for improvement
are welcome. For a more complete
overview, see ➤ Wikipedia.
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Common legacy modulation types
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AM Amplitude Modulation FM Frequency Modulation SSB Single Side Band (either LSB or USB) LSB Lower Side Band USB Upper Side Band PPM Pulse Position Modulation
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PSK Phase Shift Keying QPSK Quadrature Phase Shift Keying DQPSK Differential Quadrature Phase Shift Keying
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Pulse Position Modulation
PPM
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© Crypto Museum. Created: Sunday 26 April 2020. Last changed: Saturday, 03 May 2025 - 13:44 CET.
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