FT8 and QRM

Discussion in 'Working Different Modes' started by KP4SX, Jan 7, 2018.

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  1. KP4SX

    KP4SX XML Subscriber QRZ Page

    Oh, I'm not complaining or blaming anyone for careless operating. I'm just amazed that WsJT-X can get a solid copy on two signals of almost equal strength within a few hertz of each other.
     
  2. VA3VF

    VA3VF Ham Member QRZ Page

    I don't know... but I find it amazing when JTDX decodes two signals, on the same frequency, when one is 15 dB stronger than the other. It does not happen all the time, but enough times to catch my attention.
     
  3. KD0KZE

    KD0KZE Ham Member QRZ Page

    It is fascinating. Would be nice to read a plain-English explanation how the math works, and how this sort of thing is possible. Could be that there are enough gaps between tones in a given FT8 transmission, so two transmissions may not entirely cancel one another out, and maybe some predictability or repetition (like JT-65?), such that it's often possible mathematically to tease apart two transmissions. In any case, it's sure not like the human ear + brain. If someone is whispering something to us in a room, while another person is shouting, we just won't hear the whisper.

    73, KD0KZE / Paul
     

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