• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • A Winner has been selected for the 2025 Radioddity Cyber Monday giveaway! Click Here to see who won!

Search results

  1. W

    Accuracy of NIST tones over SW (Cross-posted)

    OK, I see where you got your figure. And it does depend on how the calibration is done. Theoretically you could do even better by projecting over the discontinuities when the 500 Hz tone is interrupted and form an averaging period much longer than 45 seconds. That assumes that the 500 Hz is...
  2. W

    Accuracy of NIST tones over SW (Cross-posted)

    I don't know where you came up with the figure of 0.01 Hz. Given that the tones are present for 45 seconds, and assuming that with a good signal the phase of the audio tone can be detected to within 10 degrees of a cycle, that is 22500 cycles at 500 Hz, plus or minus 1/36 of a cycle. That...
Top Bottom