REFLECTOR: i pad / radio noise

[Brian Michalk]

Okay, if your noise is really voltage spikes, either due to an 
oscillating voltage regulator, or a buck/boost converter, then you can 
use this:
http://www.digikey.com/product-detail/en/VFM-15C/102-2056-ND/2294930
I have used this brand before, but with the through hole PC board 
mount.  I used it on both sides of a buck/boost converter to keep it 
from making noise on the mains, as well as to smooth out power to the 
embedded devices it was feeding.

The spec sheet has its schematic, and a good whitepaper is here:
http://www.digikey.com/us/en/techzone/power/resources/articles/ac-dc-power-module-line-filtering.html


On 09/08/2013 04:34 PM, Jerome Sipple wrote:
> John, I am no electrical wizard here and I am not currently flying 
> anything but you might try an external Li battery. I have the iPad 2 
> and a iSound battery that i have had  for a few years now. The battery 
> has 5 usb ports so multiple devices can be using or recharging at the 
> same time. Just another option.
>
> Jerry Sipple
>
> On 9/8/2013 9:13 AM, John Dibble wrote:
>> 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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