It's not something unique to our board--a stock BBB has the same problem.

On Wednesday, May 14, 2014 1:41:29 PM UTC-7, Gerald wrote:
>
> Sounds like you may have grounding issues or unterminated pin . Using a 
> probe should let you be able to determine which side of the chip it is.
>
> Gerald
>
>
>
> On Wed, May 14, 2014 at 3:37 PM, <l...@ansync.com <javascript:>> wrote:
>
>> It seems to come from right around the processor, but we couldn't 
>> pinpoint it any more precisely than that, or even to one side of the board 
>> or other.
>>
>>
>> On Wednesday, May 14, 2014 10:56:28 AM UTC-7, Gerald wrote:
>>
>>> In order to mitigate it you need to figure out where it is coming from. 
>>> A probe test will help in that area. Have you run one? Using ferrites on 
>>> all cables generally helps in these types of issues.
>>>
>>> Gerald
>>>
>>>
>>>
>>> On Wed, May 14, 2014 at 12:01 PM, <l...@ansync.com> wrote:
>>>
>>>> We have a BBB-based design currently undergoing FCC testing, and 
>>>> they've found a bit of noise at 625 MHz. Has anyone else encountered this, 
>>>> or know what it might be, or how to mitigate it?
>>>>  
>>>> -- 
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>>>
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