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OLIVIA FREQUENCY PLAN
International Olivia band-plan
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Olivia Channels, Olivia
bandplan, existing and proposed frequencies for finding Olivia QSOs (these frequencies are used by MFSK modes:
Contestia, MFSK16, PAX, PAX2, etc)
Olivia
Frequencies by Band (USB Mode)
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Band
|
Center
Frequency (MHz)
|
Dial Frequency
|
Number of Tones/Bandwidth (initial)
|
Notes
|
|
160
meters
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1.8270 MHz
|
1.8255 MHz
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8/250
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(ITU Region 2; Secondary)
|
|
160
meters
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1.8390 MHz
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1.8375 MHz
|
8/250
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(ITU Regions 1, 3; Primary)
|
|
80
meters
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3.5830 MHz
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3.5815 MHz
|
8/250
|
|
|
40
meters
|
7.0730 MHz
|
7.0715 MHz
|
8/250
|
|
|
30
meters
|
10.1430 MHz
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10.1415 MHz
|
8/250
|
|
|
20
meters
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14.0730 MHz
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14.0715 MHz
|
8/250
|
|
|
20
meters
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14.1075 MHz
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14.1060 MHz
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16/1000, 32/1000
|
|
|
17
meters
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18.1030 MHz
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18.1015 MHz
|
8/250
|
|
|
15
meters
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21.0730 MHz
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21.0715 MHz
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8/250
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|
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12
meters
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24.9230 MHz
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24.9215 MHz
|
8/250
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|
|
10
meters
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28.1230 MHz
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28.1215 MHz
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8/250
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|
|
6
meters
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50.0880 MHz
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50.0865 MHz
|
8/250
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Olivia, a Multi-Frequency Shift Keying
(MFSK) radio-teletype digital mode, is an amateur radio-teletype protocol designed to work in challenging propagation conditions on radio (HF) bands. Key points about Olivia:
Olivia modes are commonly expressed as Olivia X/Y, where X represents the number of different audio tones transmitted, and Y denotes the bandwidth in Hertz over which these signals are spread.
For example, Olivia 8/250 uses 8 tones and a 250 Hz bandwidth.
The standard Olivia formats include:
8/250, 8/500, 16/500, 8/1000, 16/1000, and 32/1000.
The most commonly used formats is 8/250
Olivia is designed to perform well in low signal-to-noise ratio and multipath conditions.
It can decode effectively even under noise, QSB (fading), QRM (interference), flutter caused by polar path propagation, and auroral conditions.
The typical Olivia signal is decoded when the amplitude of the noise is over three times that of the digital signal.
This resilience makes it suitable for reliable communication in challenging environments.
Olivia allows two-way chat (QSO) communication (keyboard to keyboard) over long-distance HF ionospheric paths.
It’s especially effective over Polar Regions and other difficult propagation paths.
Unlike some other modes, Olivia is less prone to making amplifiers go out of linearity.
It operates efficiently even with class-C biasing, which is more efficient than class-A or class-AB biasing used by linear amplifiers1.
In summary, Olivia is a versatile digital mode that enables reliable communication in challenging HF conditions, making it a favourite among amateur radio operators.
International Telecommunication Union regions
map. See: ITU Regions
For more information on the
Olivia. See: http://en.wikipedia.org/wiki/Olivia_MFSK
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last revised 16 August, 2025
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