Since there are only tones in THOR micro, the number simply wraps around back to 0 when it reaches number The current tone always has 2 added before transmitting. This introduces a known pattern within the signal that benefits soft-decision decoding, boosts the forward error correction, and improves resistance to intersymbol interference. Search this site. Navigation Home. THOR Micro.
About the Olivia MFSK Digital Mode
Communication technologies that are specifically designed to improve "live" HF keyboard operation can now be achieved which were previously only theory, too complex, or too costly to implement to be practical. Thanks to the generosity of radio amateurs hams with programming knowledge, and to the Internet, new and powerful communications tools are available to all hams. The evolution and wide spread use of the Personal Computer that include a digital sound card for Digital Signal Processing DSP , is allowing radio amateurs to use these tools to develop new modes of digital communication. The distinguishing features of live HF digital operation today are the use of lower power, compact or indoor antennas and courteous operating techniques. This reverses the trend of several years ago.
This site's goal is to present information to help digital amateur radio operators better understand and be able to more efficiently use the different Olivia digital mode configurations. This Olivia information page is NOW also including information for the Contestia digital mode which is derived from Olivia and has some advantages and disadvantages of it's own. The signal can be decoded even when it is db below the noise floor i. Currently the only other digital modes that match or exceed Olivia in sensitivity are some of the WSJT program modes that include JT65A which are certainly limited in usage and definitely NOT ragchew capable.
Unlike those modes that allow you to make quick work of getting DX stations into your logbook, simply by exchanging callsigns, a signal report, and a grid square, there are other modes that offer keyboard-to-keyboard conversational QSO opportunities. Ham radio is the oldest electronic social networking infrastructure. By difficult, we are talking significant phase distortions and low signal-to-noise ratios SNR plus multipath propagation effects. The Olivia-modulated radio signals are decoded even when it is ten to fourteen dB below the noise floor.