Would someone please point me to an explanation of how the dB report of a received FT8 signal is derived. My recollection was that it was independent of the actual receiver bandwidth but simple experimentation shows that's not true. Simply narrowing the receiver bandwidth on a signal of interest results in a huge increase in the reported signal to noise ratio. This seems to imply that the noise being considered is the noise in the actual receiver passband and not the total noise in a 2.5 kHz bandwidth.
Did I remember the implementation incorrectly or has the implementation been changed fairly recently? Thanks and 73, Andy, k3wyc
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