Working Magnetic Motor on you tube??

[CLaNZeR]

Back home for the weekend this end 

My new 1/2 Stator bearings have arrived, so I know what I will be playing with this weekend
Much looser than the RC sealed ones.



Will let you know as usual how it goes.

Cheers

Sean.

[CLaNZeR]

Q:  If someone can find out from CLaNZeR if the WMV is an original and not extracted from the FLV, that would help.

Hi Yada

Sorry mate I think the WMV was converted from the youtube FLV.

Al records his originals in .MOV format and searching on my Hard drive I have the originals from Video 2 and Video 3 but not Video 1 ,

Cheers

Sean.

[crash_uni8]

hi everyone i was watching the video again and around 2:09 through 2:11  someone says something... does anyone know what he says?

http://www.youtube.com/watch?v=PIvZJ9xGutI

[FunkyJive]

Yadaraf wrote:

...because the 2nd harmonic of the power line is quite obvious at 120 Hz.

Hi Yadaraf.

Not wishing to appear overly pedantic  but the 120Hz buzz could actually be the dominant fundamental if the hum is the result of a poorly regulated supply, or burst noise from full-wave rectification getting into the amplified mic path. I think that the latter is most likely, particularly as broad-band harmonics of burst noise are evident well into the kHz region, so the only means of filtration is a comb notch filter.

There's not so much envelope power in the higher harmonics though, so I'd guess that heterodyning shouldn't significantly impact upon your spectral analysis - but only a guess though 

All the best,

FunkyJive

[Yadaraf]

Q:  If someone can find out from CLaNZeR if the WMV is an original and not extracted from the FLV, that would help.

Hi Yada

Sorry mate I think the WMV was converted from the youtube FLV.

Al records his originals in .MOV format and searching on my Hard drive I have the originals from Video 2 and Video 3 but not Video 1 ,

Cheers

Sean.

CLaNZeR,

Thanks very much.  The fact that Al records MOVs now suggests that the WMV could be from the MOV and not the FLV, in which case the WMV is still better than the FLV.  In comparison, the WMV would not be good if it were extracted from the FLV.  I guess I can convet the FLV to WMV and see what the new WMV looks like.   

New question CLaNZeR:

Q:  Could the WMV on your site have been converted from the MOV?


I mentioned that a spectral analysis of the YouTube video yields different results -- specifically, I can't detect the low frequency acceleration like in the WMV file.  It's possible that if the WMV file were extracted from the FLV file there is a compression artifact near the 120 Hz power line harmonic, which produces the appearance of a 144 Hz tone at 1700 RPM.


Cheers,   

Yada..
.