On 24/04/2023 16:54, h57jaf...@gmail.com wrote:
Hi,
while master clock in USRP X410 is multiplication of 122880000, how I
can set the sample rate exactly to 100M in gnuradio. Thank you.
See here:
https://files.ettus.com/manual/page_usrp_x4xx.html#x4xx_updating_fpga_types
Looks like supported master clock rates are 245.76MHz or 250MHz for the
_200MHz image.
For the _400Mhz image, the master clock can be set to 500MHz, BUT!!!!!
There's no DDC/DUC in that image by default.
So, the closest you can get on the X410 with existing images is 125Msps
out of the radio. You could *theoretically*
re-sample in Gnu Radio using a polyphase resampler, but resampling
from 125Msps to 100Msps would be
eye-wateringly expensive I think, and trying to do a very expensive
resampling at an input rate of 125Msps likely
couldn't be supported within Gnu Radio.
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