REFLECTOR: i pad / radio noise

[Scott Derrick]

The most likely culprit is a bad ground on the wires supplying your 12 
volt outlet. Possibly creating a ground loop.

Next on the list is your charger/adapter.  Your alternator/regulator  is 
probably not putting out a smooth 12vdc which may be coupling with the 
adapter in a bad way.

Last on the list of culprits would be the actual device, iPad, android 
tablet, phone etc causing a problem.

I've used a large android tablet for years in my plane with no problems 
in the com radios or nav equipment.

Scott

-------- Original Message --------
Subject: REFLECTOR: i pad / radio noise
From: John Dibble <aminetech at bluefrog.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 09/08/2013 07:13 AM

> I now understand why there is concern with the use of personal
> electronics on commercial aircraft.  Previously I reported erratic radio
> noise.  It was the same noise as I get when I pull the volume knob to
> receive weak signals.  Also my nav was not picking up VORs very well.
> After a long discussion with an avionics technician I decided to
> investigate my i pad.  He said that because it's not shielded, it can
> interfere.  I had a hard time believing that because many are using the
> i pad and no one else is complaining. However, I'm using a power adapter
> and he said that can be a problem also.  So I tried unplugging the power
> adapter and, sure enough, the radio noise went away.  Also the nav came
> alive and picked up VORs like it should.  I also found that if I turned
> off the alternator, I could leave the power adapter plugged in and the
> radio noise was gone.  This did not eliminate the nav problem, however.
> So now I'm turning to the electronics wizards in the group to see if
> there is any way I can have my power adapter and use it too.  Would
> insulation around the power cord help?
>
> Thanks,
>
> John
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