Hence, it is difficult to detect and equally difficult to decode. Spread Spectrum due to its nature, has a very low signal density that typically lies below the noise floor. They certainly do not work with signals being below the noise floor.īarring a few modulation modes like the Spread Spectrum, including both direct Sequence Spread Spectrum (DSSS) and the Frequency Hopping Spread Spectrum (FHSS), typically most other commonly used digital modes need signals to be above the noise floor with a positive magnitude of Signal-to-Noise Ratio (SNR). These narrowband digital mode signals may not be audible on a regular radio receiver or may not be visible on the band-scope spectrum or waterfall displays of our transceivers but there is nothing magical about it. This myth has by-and-large been perpetuated among the amateur radio community where many operators consider it to be a magical property of these digital modes. It is a common myth that narrowband digital modes like FT8, JT65, etc establish communication with signals that are below the noise floor.
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