[USRP-users] Could this be Ettus X310 self jamming problem?

Trek trek830 at qq.com
Thu Apr 2 17:44:11 EDT 2015


cool, setting this to 120MHz indeed solved my problem at 1600MHz, however it created another clock harmonic at 1560MHz (1560=120*13), which is also my point of interest on the spectrum, is there another odd clock frequency you guys could recommend for me to work with? 


thanks, 




------------------ Original ------------------
From:  "Marcus Müller via USRP-users";<ianb at ionconcepts.com>;
Date:  Apr 3, 2015
To:  "Trek"<trek830 at qq.com>; 
Cc:  ""Marcus Müller via USRP-users"<martin.braun at ettus.com>; ""Marcus Müller via USRP-users"<usrp-users at lists.ettus.com>; 
Subject:  Re: Could this be Ettus X310 self jamming problem? 



Try adding  "master_clock_rate=120e6"  (including quotes) to the Device Arguments field in the UHD Sink.-Ian
On Apr 2, 2015, at 2:13 PM, Trek <trek830 at qq.com> wrote:

In terms of GRC, how could I adjust master_clock_rate to 120MHz? Is there a setting in the USRP source properties? 
thanks, 




------------------ Original ------------------
From:  "Marcus Müller via USRP-users";<usrp-users at lists.ettus.com>;
Date:  Apr 3, 2015
To:  "Martin Braun"<martin.braun at ettus.com>; 
Cc:  "usrp-users"<usrp-users at lists.ettus.com>; 
Subject:  Re: [USRP-users]回复:  Could this be Ettus X310 self jamming problem?



Try repeating your test with a master_clock_rate of 120MHz rather than 200MHz. This should change the frequencies of harmonics related to the default radio clock.
-Ian

On Apr 2, 2015, at 1:42 PM, Martin Braun via USRP-users <usrp-users at lists.ettus.com> wrote:

> On 02.04.2015 07:16, Trek via USRP-users wrote:
>> I already did it at 1.602GHz instead of 1.6GHz, same thing except now
>> the large spike is -2MHz from 0.
> 
> This could be a clock harmonic. At 1650 MHz, do you still see something?
> 
> M
> 
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> USRP-users at lists.ettus.com
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