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

Daniel Malafaia dmalafaia at gmail.com
Wed Oct 29 14:01:16 EDT 2014


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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