Hi Joe, It is clear now, thank you.
73 Igor UA3DJY As far as I know your principal interest in JT65 is its use at HF. Failures to decode JT65 signals at HF seldom have anything to do with failure to synchronize. Indeed, at HF it would be better to have a *smaller* (definitely NOT a larger) fraction of total Tx energy devoted to the synchronization task. The JT65 protocol document http://physics.princeton.edu/pulsar/K1JT/JT65.pdf is mainly focused on the EME path. Most amateurs doing EME run high power, with PAs running at or near saturation. Nobody would choose to transmit their sync tones at larger power than used for the message's information content. -- 73, Joe, K1JT >Понедельник, 14 декабря 2015, 20:24 +03:00 от Игорь Ч <[email protected]>: > >Hi Joe and all, > >In the JT65 protocol document there is statement: 'For the tests illustrated >in Figure 4 with SNR less than about –29 dB, failure to synchronize is the >cause of many failures to decode.' > >Quick question: why do not we transmit sync vector 3 dB higher than other >tones? Some kind of the dynamic power control. > >73 Igor UA3DJY
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