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BPSK31 or MT63?

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  • Greenman Family
    Bob, The weak signal performance of PSK31 is better than MT63. However, you should also consider DominoEX, which although wider than PSK31, has similar
    Message 1 of 3 , Jan 29, 2007
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      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
    • Wayne Cypret
      Where does OLIVIA fit into this comparison? Wayne N5BZA [Non-text portions of this message have been removed]
      Message 2 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 3 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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