Sam Or Anyone, My requirement is for 15 MHz bandwidth for monitoring 15 to 30 MHz. No demodulation required. I’m confused as to which USRP unit would work for this requirement. Any help will be appreciated. I don’t mind the cost but don’t want to get one that won’t fit my requirement. It will be for monitoring Jupiter storms and solar flares. Thanks. Larry, K4LED
> On Apr 13, 2020, at 12:20 PM, usrp-users-requ...@lists.ettus.com wrote: > > Send USRP-users mailing list submissions to > usrp-users@lists.ettus.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > or, via email, send a message with subject or body 'help' to > usrp-users-requ...@lists.ettus.com > > You can reach the person managing the list at > usrp-users-ow...@lists.ettus.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of USRP-users digest..." > > > Today's Topics: > > 1. Re: UBX 10-500 MHz Question (Marcus M?ller) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 13 Apr 2020 14:48:08 +0200 > From: Marcus M?ller <marcus.muel...@ettus.com> > To: usrp-users@lists.ettus.com > Subject: Re: [USRP-users] UBX 10-500 MHz Question > Message-ID: <1670730f-772e-0818-8e3a-825fee7dc...@ettus.com> > Content-Type: text/plain; charset=utf-8 > > Hi Bob, hi Sam, > > top of my head, UBX-160 doesn't even have adjustable bandwidth > (basically, of the modern devices, only AD9xxx-based systems have). So, > yeah, you'll always get a two-sided84 MHz analog bandwidth (that's how > you get 160 MHz in complex baseband). You'll notice when oversampling at > 200 MS/s that analog filters are quite a bit worse than what's > relatively easy to do in digital filtering in an FPGA at these rate. > > On classic Gen-3 DDC chain (I do think that's the same for the newer > RFNoC chain), yes, there's two 2-decimating half-band FIRs with upwards > of 40 taps, and a CIC to do the rest of the decimation. So, if you use a > sampling rate that divides the master clock rate by 4, you get two HBs, > if it doesn't divide by 4, but by 2, you still get one of these nicer > HBs, and for odd factors, you'll fully have to rely on the CIC. That's > not necessarily terrible, but CICs do have sinc?-y shape, so that's a > bit of rolloff at the edges. > > Cheers, > Marcus >> On 10.04.20 05:44, Sam Reiter via USRP-users wrote: >> Bob, >> >> The 84MHz bandwidth constraint is because of the analog bandpass filter >> [1] on the UBX's RX signal path [2]. I'd guess that UHD will yell at you >> if you feed in an invalid bandwidth, but I've never tried it. If I >> remember correctly, you can sample at rates that aren't an even division >> of the MCR, you'll just end up using a CIC filter that causes rolloff in >> your spectrum [3]. >> >> - Sam >> >> [1]?https://www.mouser.com/datasheet/2/412/55916-1504717.pdf >> [2]?https://files.ettus.com/schematics/ubx/UBX-160_revE.pdf >> [3]?https://witestlab.poly.edu/blog/why-does-my-received-spectrum-droop-at-the-edges/ >> >> On Wed, Apr 8, 2020 at 4:49 PM Tillson, Bob (US) via USRP-users >> <usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote: >> >> so with the UBX-160 on an X310, there is the following caveat:____ >> >> __?__ >> >> * The UBX 160 transmitter path has 160 MHz of bandwidth throughout >> the full frequency range of the device; the receiver path has 84 MHz >> of bandwidth for center frequencies from 10 MHz to 500 MHz.____ >> >> __?__ >> >> I guess my question is how does this manifest itself?____ >> >> __?__ >> >> If I ask for 100 MHz of BW, do I get 84 or does it fail?____ >> >> __?__ >> >> How would I get 84 given the requirement of sample rate be an even >> divisor of 200 MHz clock?____ >> >> __?__ >> >> If I wanted 100 in that range, would there be any way to get it from >> a single channel in that band?? Most other cards don?t seem to have >> the BW in that range.____ >> >> __?__ >> >> Thanks,____ >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com <mailto: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 >> > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > ------------------------------ > > End of USRP-users Digest, Vol 116, Issue 9 > ****************************************** _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
