On Fri, Dec 21, 2018 at 11:49 AM David Bengtson <[email protected]> wrote:
> So I dug into this (On a 10k piece of equipment?) and came up with the > following bands > > 1: 3000 to 6000 > 2: 2200 to 2800 > 3: 1650 to 2200 > 4: 1400 to 1575 > 5: 700 to 1000 > 6: 500 to 530 > plus 1 unfiltered path. > Also looks like the web datasheet has some information, though it may be slightly different than what you found (page 3 of the PDF): https://www.ettus.com/content/files/USRP_N300_Datasheet_V4_Web.pdf > > Below 500 MHz, there's an 84 MHz passband based the up-conversion stage > there. > This seems like an unusual collection of passbands, in addition to > having big gaps between filter passbands. > I'm curious is someone from Ettus could comment on the design intent > behind this selection. > I'm also curious to know if these passbands have been swept with a > Network analyzer to see if there's any untoward > interaction between the highpass/lowpass filter structures used to > derive the bandpass characteristics > It would be nice to have those sweeps similar to what is published on the E310 product page: https://www.ettus.com/content/USRP_E3xx_RX_Filter_Graph_Web.png https://www.ettus.com/content/USRP_E3xx_TX_Filter_Graph_Web.png Maybe the E310 and N310 share similar Minicircuits filters placed back to back? Brian
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