[USRP-users] cpu frequency and harmonic suppression

Ekko chai18740449846 at gmail.com
Sun Mar 6 08:37:30 EST 2016


hi marcus
my signal is a 20KHZ Single Carrier with the samp rate 100K,
send to uhd sink, and the center frequency is 3.7Ghz,
and i see the output of tx just like
blob:https%3A//mail.google.com/39989e6d-de82-44f0-aa8c-495da3f570b6

the mark1 is center peak,and the mark2 is the sideband that i mean ,i think
the mark2 should be lower than what i see
so i want to know how to improve the sideband suppression

*the E310 cpu frequency is as you said  that the default value is 667MHZ ?
or i can set the frequency value?

thank you

--Ekko


2016-03-04 18:17 GMT+08:00 Ekko <chai18740449846 at gmail.com>:

> hello Sylvain
> this is the baseband not the RF.
> as you see
> the mark1 and mark2 , mark1 is the Peak of 3.7G mark2 is the sideband,
> the sideband suppression is only 33.45db i want to know how to improve
> this value.
> this is the baseband not the RF
>
>
> 2--->>>>>>>>>>>what is the cpu frequency of E310?
>
>
> thank you
> --Ekko
>
> 2016-03-03 20:26 GMT+08:00 Sylvain Munaut <246tnt at gmail.com>:
>
>> Hi,
>>
>> > The second ------>>>this is about the  harmonic suppression.
>> > i mesured the  harmonic suppression when the center frequency is 3.7GHZ
>>
>>
>> You might want to explain you setup a little better ...
>>
>> Harmonic of a 3.7G TX would be at 7.4G which your E4406 can't show.
>> AFAICT, assuming you're TXing a 20kHz tone, your picture is just
>> showing a DC offset and an IQ image.
>>
>>
>>
>> Cheers,
>>
>>    Sylvain
>>
>
>
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