Hi Martin, Thanks for your kind offer. I would be very interested in obtaining the taps for the half-band filters in the X300 series, if it’s not too much trouble.
Another contributor emailed me the taps for a USRP half-band filter yesterday, but they weren’t 100% sure if the taps were from the X300 series, or one of the older USRP models. Here is a link to the FPGA code on GitHub where the taps came from: [https://github.com/EttusResearch/uhd/blob/master/fpga/usrp3/lib/dsp/hb_dec.v](https://github.com/EttusResearch/uhd/blob/master/fpga/usrp3/lib/dsp/hb_dec.v "hp_dec.v") Based on the taps in the above link, I was able to generate the filter response shown in the see attached PNG. From this I was able to extract the following table of “usable bandwidths” for different insertion loss specifications: * **Max IL spec : Usable BW (as % of decimated sample rate)** * 0.00075 dB (passband equiripple limit) : 70% * 0.5 dB: 83.5% * 1 dB : 87% * 3 dB : 94% * 6 dB : 100% Brendan.
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