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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Lee,
Did you find out what cause the noise? We have the same problem right now.
Our noise is from 300M to 600M.
Regards,
Shu
On Wednesday, May 14, 2014 at 3:59:24 PM UTC-5, Lee Crocker wrote:
>
> It's not something unique to our board--a stock BBB has the same problem.
>
>
> On Wednesday, May
Liyaoshi,
We have the same problem. I agree with what you mentioned. We checked If
the RJ45 cable is not plugged in, but still failed the Radiated emissions
test. What else we should look into? the RJ45 connector has the integrated
magnetic.
Regards,
Shu
On Wednesday, May 14, 2014 at 9:52:10
In a similar problem it helped for me to replace the 0.1R that connectes
Ethernet shield to the frame of the Beaglebone by a simple solder bridge.
This resistor is located on the solder side of the Beaglebone, just below
the network connector.
I have a spectrum analyzer and a 3GHz active probe an
Gunter,
Thank you for your advice. We will definitely try that, though I really can
not tell the reason behind that.
Regards,
Shu
On Sat, Jan 31, 2015 at 12:23 PM, 'dl4mea' via BeagleBoard <
beagleboard@googlegroups.com> wrote:
> In a similar problem it helped for me to replace the 0.1R that co
Gunter,
We tried that and this did not work for us. The noise was still there. They
said the noise was coming out with a clock signal. Any ideas? Should we
check the crystals or something else? Any ideas?
Regards,
Shu
On Saturday, January 31, 2015 at 12:23:15 PM UTC-6, dl4mea wrote:
>
> In a s
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, wrote:
> We have a BBB-based design currently undergoi
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
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, wrote:
> It seems to come from right around the processor, but we couldn't pinpoint
> it any more precisely t
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
>
OK. Understood. Different test equipment will yield different results. And
it can be effected by the SW you are running.
Gerald
On Wed, May 14, 2014 at 3:59 PM, wrote:
> 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,
625M clock noise maybe from 125M clocksource， or 25M
This might be from ethernet
Do you use GIGA ethernet ?
And
Try to unplug the RJ45 cable
2014-05-15 5:01 GMT+08:00 Gerald Coley :
> OK. Understood. Different test equipment will yield different results. And
> it can be effected by the SW you ar
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