[USRP-users] usrp transmit have some unknown peaks

Page Jack jack.page999 at gmail.com
Sat Sep 22 22:22:46 EDT 2012


Hi Josh,
The frequency of the two peaks in the left side and right side don' t move when
the main signal frequency changes. one is at 988M and the other is at 936M.

Regards!

On 9/22/12, Josh Blum <josh at ettus.com> wrote:
>
>
> 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.
>
> -josh
>
>>
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>
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