Olivia MFSK

Olivia MFSK is an amateur radio teletype protocol designed to work in difficult (low signal-to-noise ratio plus multipath propagation) conditions on shortwave bands. The signal can still be properly copied when it is buried 10 dB below the noise floor (i.e. when the amplitude of the noise is just over 3 times that of the signal). The protocol was developed at the end of 2003 by Pawel Jalocha.

The first on-the-air tests were performed by two radio amateurs, Fred OH/DK4ZC and Les VK2DSG on the Europe-Australia path in the 20-meter amateur band. The tests proved that the protocol works well and can allow regular intercontinental radio contacts with as little as one watt RF power. Since 2005 Olivia MFSK has become a standard for digital data transfer under white noise, fading and multipath, flutter (polar path) and auroral conditions.

The standard Olivia MFSK formats (bandwidth/tones) are 125/4, 250/8, 500/16, 1000/32, and 2000/64. However the most commonly used formats in order of use are 500/16, 500/8, 1000/32, 250/8, and 1000/16. This can cause some confusion and problems with so many formats and so many other digital modes. After getting used to the sound and look of Olivia MFSK in the waterfall, though, it becomes easier to identify the format when you encounter it. About 90% of all current Olivia MFSK activity on the air is one of the 2 formats : 500/16 and 1000/32.

Olivia 125/4 test sample
Olivia 250/8 test sample
Olivia 500/16 test sample
Olivia 1000/32 test sample
Olivia 2000/64 test sample


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