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9166JT65/JT4 - Max sync values + frequencies

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  • booz2m
    Oct 1, 2012
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      Hi all

      Max sync values
      I wonder what is the highest possible "sync value" in JT65 and JT4 respectively? Even if I connect two PCs directly to each other I have not seen values above say 28. E.g. shouldn't it be 63 for JT65?

      Frequencies
      I have seen several values for the highest tone in JT65. For JT65C I have seen values from 685 Hz to 711 Hz. However, using the math from "The JT65 Communications Protocol, March 9, 2005" I cannot get anything else than ~700 Hz (JT65C) above the sync tone.

      Tone_N = Multiplier * (N+2) * 11025/4096, were

      Multiplier: ~A = 1, ~B = 2 and ~C = 4
      N: 0 to 63

      Thus for JT65C:
      Tone_0 = 4 * 2 * 11025 / 4096 = 21,533203125 Hz above sync
      Tone_63 = 4 * 65 * 11025 / 4096 = 699,8291015625 Hz above sync

      73
      Bo, OZ2M
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