Thank you for the screenshot, Marcus. The noise floor shape you obtain has the same behaviour as the noise floor shape we obtain.
So, assuming this is the "nominal" behaviour, do you have any equalization method to suggest? Regards, Carlo Venier Il mer 28 giu 2023, 20:02 Marcus D. Leech <patchvonbr...@gmail.com> ha scritto: > On 22/06/2023 05:48, Carlo Venier wrote: > > Good morning, > > I have some questions regarding the TwinRX daughterboard. > > 1) With the following settings: > Master Clock Rate = 200 MHz > Tuning Frequency = 2450 MHz > Sample rate = 100 Msps > Gain = 93 > Every RF connector is 50 Ohm terminated > LO_OFFSET disabled > > I get a non-flat spectrum. In particular, the center portion of it is up > to 5 dB higher than at +/- 40 MHz from the tuning frequency. You can see > this behaviour in the attached figures. > > 2) The two channels have a different behaviour below 1.8 GHz (for example > at 450 MHz). The spectrum of channel :1 is a lot more wavy than the > spectrum of the channel :0. You can see this behaviour in the attached > figures. > In any case, also below 1.8 GHz the delta between min and max level is > about 5 dBs. > > 3) Sometimes, the DC component pops up. As the TwinRX channels are a > superheterodyne receivers, I don't expect that the DC component appears, > but it happens. > > Is it possible that the TwinRX I'm using is not working properly? Or am I > missing some settings? > > 4) Can somebody provide a screenshot of the spectrum of the TwinRx > channels with the same settings at 1) for the tuning frequencies of 450 MHz > and 2450 MHz? > > Thank you. > > > Best regards, > > Carlo Venier > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com > > Here is my test, with the input terminated, and the gain at 80dB: > > http://www.ccera.ca/files/2450.png > > That's for 2450MHz, 100Msps > > http://www.ccera.ca/files/450.png > > That's for 450MHz, 100Msps, again 80dB gain > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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