[USRP-users] usrp transmit have some unknown peaks

Josh Blum josh at ettus.com
Fri Sep 21 23:25:57 EDT 2012

On 09/20/2012 09:36 PM, Page Jack wrote:
> Hi all,
> I use usrp and rfx900 transmit signal, beside the main signal, dc offset, i
> q imbalance. there are still
> some peaks which I don't know how them generated and do they harm for the
> main signal.
> in the attachment photo, the three peaks in the middle is main signal, dc
> offset, i q imbalance. and
> there are two other peaks in left and right. so what are they?

It could be a mixer product of one of the other strong tones in that
plot. Sometimes it is helpful to move around the main tones and see how
the harmonics move (or dont more). Thats the only way to really know.


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