[USRP-users] B200 - Spurs at the frequency domain

Michael West michael.west at ettus.com
Wed Oct 29 22:08:36 EDT 2014


Hi Daniel,

I honestly have no idea what could be causing harmonics every 40MHz unless
the master clock rate was changed to that value.

Regards,
Michael

On Wed, Oct 29, 2014 at 11:01 AM, Daniel Malafaia <dmalafaia at gmail.com>
wrote:

> Dear Michael,
>
>  that was spot on, there's harmonics in multiples of the master clock at
> 32 MHz. Also I found out that at the same time it also happens at 40MHz
> multiples, what would be the source of that?
>
> Best Regards,
>  Daniel Malafaia
>
> 2014-10-27 19:54 GMT+00:00 Michael West <michael.west at ettus.com>:
>
>> Hi Daniel,
>>
>> It could be a harmonic of the master clock.  The default master clock
>> rate is 32 MHz and 5x32=160.  Try setting the master clock rate to a
>> different value to see if it changes.
>>
>> Regards,
>> Michael E. West
>>
>> On Sat, Oct 25, 2014 at 2:13 PM, Daniel Malafaia via USRP-users <
>> usrp-users at lists.ettus.com> wrote:
>>
>>> Hi all,
>>>
>>>  I'm analyzing the B200 and I found out that the frequency response have
>>> some high power spurs.
>>>  In annex I'm sending an example. In this example the data was gather at
>>> a Fc=161MHz, Fa=(5+1/3)MHz with a 36.5 gain and with the B200 closed at a
>>> Faraday cage with no external sources of noise and with the connected
>>> laptop covered in aluminium.
>>>  In this situation there's a visible spur at 160MHz, does someone knows
>>> what the source may be?
>>>
>>> Best Regards,
>>>  Daniel Malafaia
>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing list
>>> USRP-users at lists.ettus.com
>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>
>>>
>>
>
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