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<mailto: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<mailto:yen...@gmail.com>> 대신 
Discuss-gnuradio 
<discuss-gnuradio-bounces+ksshin=postech.ac...@gnu.org<mailto:postech.ac...@gnu.org>>
보낸 날짜: 2019년 4월 24일 수요일 오후 8:03
받는 사람: discuss-gnuradio@gnu.org<mailto: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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