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Re:BPSK31 or MT63?

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  • Wayne Cypret
    Where does OLIVIA fit into this comparison? Wayne N5BZA [Non-text portions of this message have been removed]
    Message 1 of 3 , Feb 1, 2007
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      Where does OLIVIA fit into this comparison?

      Wayne
      N5BZA


      [Non-text portions of this message have been removed]
    • Walt DuBose
      KC7WW s test of PSK31 and MT63-1K and MT63-2K (http://www.johanforrer.net/hfpsk.htm) shows that MT63-2kHz, double interleave factor. Test at -5dB SNR, 3kHz
      Message 2 of 3 , Feb 2, 2007
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        KC7WW's test of PSK31 and MT63-1K and MT63-2K
        (http://www.johanforrer.net/hfpsk.htm) shows that MT63-2kHz, double interleave
        factor. Test at -5dB SNR, 3kHz Bandwidth AWGN was considerly better than PSK-31
        tested at -10dB SNR.

        Richard, G4HPE, wrote a paper, which is on the RSGB web site under emergency
        communications (http://www.rsgb.org/emergency/operating/datamodes2.pdf)

        Walt/K5YFW


        Greenman Family wrote:
        >
        >
        > Bob,
        >
        > The weak signal performance of PSK31 is better than MT63. However, you
        > should also consider DominoEX, which although wider than PSK31, has
        > similar sensitivity to BPSK31. Better still, it has excellent typing
        > speed and very easy tuning.
        >
        > DominoEX8 achieves 55 WPM at similar S/N to BPSK31, and has a tuning
        > tolerance of about 100Hz. Using good software (such as ZL2AFP DominoEX)
        > you can read signals down to -15dB S/N and see them well enough to tune
        > on the waterfall display at -18dB S/N. The optional FEC actually works
        > (gives about 1-2dB improvement, more under impulse noise), at the cost
        > of halving the typing speed.
        >
        > Don't be fooled by the fact that you can copy MT63 signals you can't
        > hear. It's not surprising, since the signal sounds like noise. It's easy
        > to confirm with a simulator that BPSK31 and DominoEX (even MFSK16) have
        > the edge.
        >
        > It's a different matter when there are ionospheric effects, and there
        > MT63 has some advantages. But that's not what you asked about.
        >
        > You can read about DominoEX at www.qsl.net/ zl1bpu/DOMINO
        >
        > 73,
        > Murray ZL1BPU
        >
        >
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