HIGH QUALITY TPU DVD Video Released from Jack Durban

[EMdevices]

Why does he mention the 7.3 Hz vibration of the first TPU (spool type)  ?

Measuring or estimating such frequency by ear is impossible. Only a very high quality microphone can go that low. 7.3 Hz could be a speculation if no clear claim vibration was measured with a mic exists. Measuring ambient EM fields of this frequency are also very problematic I think.

that's exactly the point,  why does he mention the vibration to the decimal point?   It's because he MEASURED it.  On a scope?  yes,  it is a beat frequency, and you can see those quite easily on the scope.

EM

[aleks]

that's exactly the point,  why does he mention the vibration to the decimal point?   It's because he MEASURED it.  On a scope?  yes,  it is a beat frequency, and you can see those quite easily on the scope.

Why would it beat at 7.3Hz? Beat frequency is a difference between two frequencies of any magnitude being summed. This means that one of the frequencies in the sum should be shifted by 7.3Hz against the other. I do not see how one of the frequencies can be shifted due to ambient oscillation without the other shifting there as well and thus removing any beating. The only 'sane' answer is that SM puprosely used two frequencies with a difference of 7.3Hz between them. Being at beating is energy ineffective. Any natural - or rather naturally induced - oscillations won't (or likely won't) exhibit such behavior.

Then you should ask yourself how a sinewave of 100Hz can be shifted to 107.3Hz, for example? This is heterodyning which in the simplest case can be produced from a sum of 7.3 Hz and 100 Hz with a heavy saturation applied. This will produce intermodulation distortion with 107.3Hz created. Not to note this will work only if the amplitudes of both 100 Hz and 7.3 Hz waves are basically equal. Otherwise no such heterodyning will be present (only a normal saturation of the loudest wave will happen).

[sypherios]

this is great

[turbo]

great?
it's starting to look like the biggest joke in history.

[sparks]

         Looks to me like Mark or Marks whatever was a tinkerer.  He has more shit taped down to the open tpu stonehenge looking thing than U-DO-IT electronics distributor has in it's central warehouse.
    Build it and you will understand?  Build what?