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
>>>> _______________________________________________
>>>> To change your email address, visit
>>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>>
>>>> Visit the gallery! www.tvbf.org/gallery
>>>> user:pw = tvbf:jamaicangoose
>>>> Check new archives: www.tvbf.org/pipermail
>>>> Check old archives:
>>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>>
>>>
>>
>> _______________________________________________
>> To change your email address, visit
>> http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery! www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
More information about the Reflector
mailing list