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> 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 > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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