REFLECTOR: Grand Rapids EFIS

[Dave Dent]

Because of transmitting signals it can disrupt data from the magnetometer.  I was warned by Todd at GRT about this.  I found no evidence of the problem because I tried to keep them away anyway.  So I made sure I didn't tie any of the cables together.  I had some within a couple of inches in some places and it didn't show any effect.  But it may have if I had them tied to the coax cable direct. In the strake I have a separate tube to carry the coax cables through.
 
I did notice one time that I had a slow slew of compass on the EFIS during a high G turn but only once did it show. Otherwise it is very responsive and steady.  I may have been talking on the radio at the time. I just don't remember.  But it did show once.  If I had been looking for it I may have put it together with the transmitting and turning at the same time.  I will have to check this out again sometime.  
Dave
  ----- Original Message ----- 
  From: Al Gietzen 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Thursday, September 08, 2005 10:23 AM
  Subject: RE: REFLECTOR: Grand Rapids EFIS


  Dave;



  I understand about keeping the magnetometer away from steel parts, but I'm not aware of the need for separation of the magnetometer leads from any coax (as in antenna leads, I presume).  What's up with that?



  Thanks,



  Al



  > I ran the wires from the magnetometer to the AHRS away from any coax

  > cables,

  > as best I could.  I went down the middle of the keel, on the  Velo. On

  > the

  > other plane (Cozy) I had to run them near the coax cables but separated.

  > I

  > found this best.  Do not tie them together.  The object is to keep the

  > magnetometer at least nine inches away from any steel moving parts.  I





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