What do you attribute the approx 5KHz bandspread to? It seems to have a sharp cut off indicating perhaps that this an equipment limit -but this would need an analysis of the mechanics involved in the measurements- whilst the source stays out of the picture. I suggest the LF cut off could be due to the higher amounts of energy increasingly needed to drive natural mechanisms at LF whereas there's a lot HF free energy flying about from the Sun and upper atmosphere lightning activity. I have to allow that cloud charges are static and unipolar until they discharge- but that would be mostly a stable state. Your results seem to show a stable presentation though- over time very little deviation apart from the LF modulation @ 200ms shown on the Mod trace. The 9 ms chopping effect looks how I imagine the switched Police radio channels[Tetra] would present. Is that a possibility ? - though the p.r. frequency's a bit out from 16 Hz. It's quite possibly a secondary system running or an unpublished switch of channel hopping freq would explain this. I know you have stated: this energy is neither a sound wave or a radio wave - but the parallels are there. Other [unknown] mechanisms could interface the modes of energy transfer.
On Jun 18, 5:01 am, John Dawes <[email protected]> wrote: > As I have tried to make clear, it was not my to intension to mimic the > sound we hear. > The experiment is very simple, to set a small mass into vibration over > the range of frequencies from about 20 to 100 cycles per second and > observe the motion that takes place. > I found that a 2 points above and below 50 cycles per second the > vibrating mass exhibit’s a modulation that should not be there and the > only conclusion can be that some form of energy is effecting what > should be the simple harmonic motion of the vibrating mass and that > this energy is neither a sound wave or a radio wave. > > I think it would be difficult if not impossible to determine if > everybody perceives exactly the same noise, this is a very complicated > subject, for some sufferers experience the effects throughout the > whole of their body. > > On Jun 18, 3:00 am, Trev <[email protected]> wrote: > > > > > Something else I meant to mention in the SA file ,apart from the > > repetitive freq spread (indicating either some possible aliasing or > > even artifact in the source), is that the 'cut offs' of the > > fundamental are limits of what many people report as Hum. > > > Mine , at the low end of 27 Hz, and upper- at 80 Hz, as the usual max > > of others where it tangles (intermodulates?) with mains supply freq. > > causing the annoying beat 'throb', that wears so. > > This is shown as the wide yellow band at the base of the the spectrum. > > > Yes!, wideband, repetitive and suspiciously clean- all in all, coupled > > with the unique measurement technique makes this more than a chance > > occurence. > > > What are your thoughts John? > > > On Jun 17, 11:39 pm, Pete <[email protected]> wrote: > > > > I've got my computer output wired up to a NAD amplifier with some good > > > bass responsive Acoustic Research loudspeakers out putting the sound. > > > So, if the volume is turned right down until I just about hear this > > > MP3, and the imagine it's in my head rather than coming from the > > > speakers, then it's pretty damn close. If it went up and down randomly > > > as it does, or as it does as I perceive it, then it'd be spot on.- Hide > > > quoted text - > > > - Show quoted text -- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hum-sufferers?hl=en -~----------~----~----~----~------~----~------~--~---
