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Re: [Discuss-gnuradio] Two channel receiver

From: YENDstudio
Subject: Re: [Discuss-gnuradio] Two channel receiver
Date: Fri, 26 Apr 2019 14:54:18 +0300

Hello Kyeong,

Thanks for the info; I will check more. It seems that some hardware modifications are required.


On Fri, Apr 26, 2019, 06:01 Kyeong Su Shin <address@hidden> 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.

Kyeong Su Shin

보낸 사람: YENDstudio <address@hidden>
보낸 날짜: 2019년 4월 26일 금요일 오전 1:43
받는 사람: Kyeong Su Shin
참조: address@hidden
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 <address@hidden> 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.

Kyeong Su Shin

보낸 사람: YENDstudio <address@hidden> 대신 Discuss-gnuradio <discuss-gnuradio-bounces+ksshin=address@hidden>
보낸 날짜: 2019년 4월 24일 수요일 오후 8:03
받는 사람: address@hidden
제목: [Discuss-gnuradio] Two channel receiver

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.


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