Comment by Heino R. Pull on September 4, 2011 at 7:53am

That looks really good - it is so important to use the sonar/baro alt logging function to check your sonar noise performance and not just trust the CLI's sonar values. Until my sonar's plot matched my baro plot like yours does,  I was getting very intermittent alt hold performance.

Comment by Balloon on September 4, 2011 at 8:30am

I use cable shield from old USB Hub. I'm solder Shield line to GND in sonar and IMU Port (Pitot Port).

When, I change ALT Hold Mode. It high performance and rather Stable level. Yeah !!!!!

 

In Log I change ATL Hold Mode in period 1200 - 2200 line number on the graph

Comment by Markus Wolfarth on September 4, 2011 at 11:19am

I use a shielded Microphonecable as well :)

Comment by Balloon on September 4, 2011 at 11:29am

It's work.

Comment by Björn Geir Leifsson on September 6, 2011 at 8:29am

A real shielded cable is of course the way to go.

I just wonder...

Can any of the electronics guru´s tell us if a twisted three-wire lead would give the same or sufficient shielding effect?

Twisted servo leads is a common technique used in the RC world and said to diminish RF interference in longer leads by a cancelling effect. Many also use ferrite cores that the servo leads are wound through a few times.

Twisted wire example  Ferrite core filter example 

 

Comment by Balloon on September 6, 2011 at 9:20am

What're you have sonar graph ?

Becuase, I be used ferrite cores but It have some noise. TT_TT

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