Hello Kyeong, Thanks for the info; I will check more. It seems that some hardware modifications are required.
Regards On Fri, Apr 26, 2019, 06:01 Kyeong Su Shin <kss...@postech.ac.kr> wrote: > Hello YENDstudio, > > I know that USRP 1 can take two RF daughterboards, but the effective > sampling rate of the device in this configuration is a bit limited > (probably too slow for LTE applications). > > You can probably use two SDR boards with synchronization capabilities (or > synchronization hacks) and a suitable clock generator. I know that my > HackRF boards can do this ( > https://github.com/mossmann/hackrf/wiki/Multiple-device-hardware-level-synchronization > ), but I never tried this by myself (and the sample alignments can be off > by ~50 samples, according to the wiki, so you have to correct that for the > perfect alignment). I also know that there are a few cheap SDRs with > synchronization capabilities,like AirSpy, but I never used them. > > You can make your own RF frontend and add that to one of the antenna ports > of a LimeSDR-like SDR by using a mixer and a clock generator (available on > RF components stores, or on eBay/AliExpress, if you are willing to deal > with dodgey sources). You may have to add an additional LNA (LNA4ALL? ) > and/or a filter before the mixer to improve the noise figure (but you need > to make sure that you are not overloading your SDR by doing so). All of > these parts are available as SMA-type plug-in modules, and are in > reasonable price, if you are okay with cheapo eBay/AliExpress parts. > > Regards, > Kyeong Su Shin > ------------------------------ > *보낸 사람:* YENDstudio <yen...@gmail.com> > *보낸 날짜:* 2019년 4월 26일 금요일 오전 1:43 > *받는 사람:* Kyeong Su Shin > *참조:* discuss-gnuradio@gnu.org > *제목:* Re: [Discuss-gnuradio] Two channel receiver > > I just wanted to receive time-synchronized channels. > > On Wed, Apr 24, 2019, 15:15 Kyeong Su Shin <kss...@postech.ac.kr> wrote: > > Hello YENDstudio, > > Do you actually need a two-channel receiver? Maybe you can get away by > using two separate SDRs (possibly synchronized with PPS and 10MHz clock) > and a splitter (or two antennas). > > An another alternative would be adding a custom mixer (and a filter, if > needed) between the SDR and the antenna. > > Regards, > Kyeong Su Shin > ------------------------------ > *보낸 사람:* YENDstudio <yen...@gmail.com> 대신 Discuss-gnuradio > <discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org> > *보낸 날짜:* 2019년 4월 24일 수요일 오후 8:03 > *받는 사람:* discuss-gnuradio@gnu.org > *제목:* [Discuss-gnuradio] Two channel receiver > > Hi, > > Does anyone know any affordable (not thousands) SDR which can receive two > frequencies separately. I want to receive LTE UL and DL channels which can > be more than 100 MHz appart. The LO offset in USRP B210 and Limesdr is not > enough to cover the two frequencies with a shared frequency synthesizer. > > Regards > >
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