yes, its seems that we loose several dBs but which can be widely compensated by the extremely large TwinRx gain range.
Le 24/03/2018 à 06:38, Marcus D. Leech via USRP-users a écrit : > On 03/24/2018 12:41 AM, Matis Alun via USRP-users wrote: >> Hi, >> >> The TwinRx frequency specifications is from 10MHz to 6GHz. >> >> However, some tests shows that I can select the center frequency around 10 >> MHz with a >> sampling frequency of 25MHz >> which allows to make some acquisitions in the HF band (3-30 MHz) with a very >> good quality. >> >> My question is: why the specs limits to 10 MHz ? Is the RF part have >> degraded performances >> under this frequency ? >> >> Below this question is: we have to deliver a big HF (3-30 MHz) system to a >> customer. The >> acquisition part is actually built with >> 2 x N210 with LFRX daughter boards. Due to the lack of chain gain of this >> configuration, >> we add some RF pre-amplifiers >> in order to have good RF levels at the LFRX input. >> Maybe that this configuration can be replaced by 1x X300 + TwinRx (we didn't >> make this >> choice because of the TwinRx specs) ? >> >> Regards, >> >> matis >> >> > My guess is that signals below 10MHz can be received, but the RF amplifiers > in the > low-band portion of the TwinRx likely fall off in gain quite a bit > below 10MHz. > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
