REFLECTOR: i pad / radio noise

[John Dibble]

I'm using a car charger with a cigarette lighter outlet.  I actually 
have 2 outlets that I use for my noise cancelling headset and my ADS B 
receiver.  No problems with them so I think the ground to the outlets is 
good. Is there a way I can "smooth" out the effect of the alternator? 
That would not address the NAV issue, however.

John

On 9/8/2013 10:10 AM, Scott Derrick wrote:
> 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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>