REFLECTOR: i pad / radio noise

John Dibble aminetech at bluefrog.com
Sun Sep 8 14:22:40 CDT 2013


Thanks.  I'll try it.

John

On 9/8/2013 12:14 PM, Laurence Coen wrote:
> John,
>
> I suspect that you are directly coupling noise into your power buss. 
> Go to Radio Shack and get an outlet extension and a ferrite choke that 
> snaps over the wire.  This should block interference from the adapter 
> traveling back into the outlet.  These chokes can be found on many 
> cables, (USB, RS232 ect.), to prevent interference between 
> interconnected devices.
>
> Larry Coen
> N136LC
>
> --------------------------------------------------
> From: "John Dibble" <aminetech at bluefrog.com>
> Sent: Sunday, September 08, 2013 11:29 AM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: Re: REFLECTOR: i pad / radio noise
>
>> 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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>>
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