Lower values are seen, but it seems that the FT8 decoding threshold is more sensitive to QRM than JT65 which does not surprise, given the shorter transmissions. Without JT65 it would not have been possible to contact stations like 5W1SA and 3D2AG on 60 metres with a modest setup and a challenging man made noise environment.īut with FT8, signals below about -18 become unreliable. Decoding up to -30 dB and very reliable under difficult conditions, like overlapping stations (JT65, FT8 and even PSK), multiple stations calling on the same frequency as well as other interference from various sources. One could also say that the aim was to try to compare the reliability of real world amateur radio transmission circuits.įor the author, JT65 with JTDX has been the ultimate combination. The author compared JT65 and FT8 in real world situations with fading, interference, static, overlapping stations and so on. It has to be said that Franke and Taylor (FT) have done a tremendous job with the development of various weak signal modes and FT8 is certainly a valuable addition to the ‘line’ of JT modes. It was adopted fast by the amateur radio community and it is clear that FT8 overtook JT65 quickly.
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