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Forum: Tech Log

22nd May 2011, 21:40

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

Sure they are. Every high tension test site has...

Sure they are. Every high tension test site has them, since high voltage surge protectors need to be tested too. The general lightning bolt shape with rise and fall times and current range 10kA to...

Forum: Tech Log

12th May 2011, 11:04

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

On the bodys there is a very good chance that...

On the bodys there is a very good chance that they simply explode if you raise them from their 400bar environment and assume the gaseous decay by the time now. Thats an extreme burdeon on all people...

Forum: Tech Log

11th May 2011, 17:11

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

GarageYears, if you know how the signal...

GarageYears,

if you know how the signal looks like you searching for, you get much more signal to noise than with only digital reducing the ambient noise. However the current frequency tolerance...

Forum: Tech Log

11th May 2011, 15:33

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

JD-EE you are correct that the FFT window needs...

JD-EE you are correct that the FFT window needs to be about 100Hz for the 10ms pulses. A bit frequency shift you get anyway by doppler effect, since the towed array needs to move. However you should...

Forum: Tech Log

11th May 2011, 07:58

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

There are plenty ways to PLL a RC oscillator with...

There are plenty ways to PLL a RC oscillator with a Xtal reference even with low power. The timing can be done with a relativ low frequency low power device like in a GSM phone. It is also not a...

Forum: Tech Log

10th May 2011, 19:02

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

Coherent sampling should work, if the frequency...

Coherent sampling should work, if the frequency is stable and the ping time interval is well controlled. I would assume that both are XTAL based which would get you easily in the 1e-6 to 1e-8...

Forum: Tech Log

8th May 2011, 16:10

Replies: 2,546

AF 447 Search to resume (part2)

Views: 933,652

Posted By EDLB

So it came down at a steeper than 45 degree angle...

So it came down at a steeper than 45 degree angle in about 4 minutes. Anyone familiar with what type of spin that could have been?
Since it did not disintegrate to small pieces at impact I assume...

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