Dear Marcus, Thank you very much for the information. Everything is clear now.
Best, Pablo De: Marcus Müller <marcus.muel...@ettus.com> Enviado el: jueves, 19 de octubre de 2023 14:55 Para: usrp-users@lists.ettus.com; Mico-Soler Pablo <pablo.m...@inetum.com> Asunto: Re: [USRP-users] Inetum company (Spain) technical support: Ettus USRP X440 & USRP X410 SDRs No suele recibir correos electrónicos de marcus.muel...@ettus.com<mailto:marcus.muel...@ettus.com>. Por qué esto es importante<https://aka.ms/LearnAboutSenderIdentification> Dear Pablo, welcome to the usrp-users community! Let's quickly answer your questions in-text: On 19.10.23 12:03, Mico-Soler Pablo via USRP-users wrote: Regarding X440, ETTUS USRP X440 (8 TX AND 8 RX, 1.6 GHZ BW, 30 MHZ TO 4 GHZ SDR, GPSDO): 1. If each channel has a bandwidth up 1.6GHz, why the total instantaneous bandwidth is 3.2GHz if it has 8 channels (1.6GHz*8channels > 3.2GHz)? The digital architecture just doesn't allow us to do that. The accumulated internal data rate becomes challenging. (Just to illustrate: 1.6 GS/s · 8 = 12.8 GS/s, at 16 bit per I and Q, so 32 bit per sample, that'd be 409.6 Gbit/s; you couldn't even get that into or out of the device using the interfaces supplied) 1. Regarding "IF-Bandwidth combination limitations apply due to Nyquist zones and gaps", * If we tune CH1 at 830MHz, are we going to be able to detect all the spectrum from 30-1630MHz? Yes, but beware that you need to supply your own front-end with the X440! Otherwise, you'll observe 30-1630 MHz, superimposed with what's 1630-3230 MHz and up until the (not extremely sharp) ca 4GHz cut off, what's in 3230-4830 MHz, too. * If we tune CH2 at 2430MHz, are we going to be able to detect all the spectrum from 1630-3230MHz? * If we tune CH3 at 4000MHz, are we going to be able to detect all the spectrum from 3230-4000MHz? Yes! Remember, though, that you're seeing all these bands as aliased into baseband (see above), so you need to sufficiently filter your analog signal, and that will have some transition bandwidth. 1. Which the real maximum channel BW? 1600 MHz Is it possible to decrease the minimum frequency down to 20MHz? We don't have measurements for that. The analog signal processing of what is fed into the ADCs has a lower cutoff, and we qualified the product down to 30 MHz, not 20 MHz. That doesn't mean you won't see what's at 20 MHz, but that we can't make any guarantees about that. Also, broadband matching is hard, so I'd confer with whatever team supplies that input on how far down they really need to go. 1. Is it possible to increase the maximum frequency up to 6GHz? Same answer as above. Could you provide the USRP X440 datasheet to see their RF/Digital performance parameters? https://www.ni.com/docs/de-DE/bundle/ettus-usrp-x440-specs/page/specs.html Regarding X410, ETTUS USRP X410 (4 TX/RX Channels, 400 MHz BW, Zynq US+ RFSoC ZU28DR) 1. Is it possible to configure RX0 as an extra receiver channel, so instead of having 4 receiving channels [RF0 (RX1), RF1 (RX1)] & [RF0 (RX1), RF1 (RX1)] (Fig 1), we could have 8 receiving channels (Fig 2)? Not really, no. https://files.ettus.com/manual/page_zbx.html Not enough ADCs! If previous question is not possible, do you have in your roadmap to develop an X410 version with 8 channels? I'll have to pass on that, as product strategy isn't what I'm involved with. You'd probably be better served with 2× X410, from a computational point of view, probably. Best regards, Marcus
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