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Thanks for finding this bug. I have applied your fix to my git repo.
I’m away from any equipment right now, but if someone could confirm that
this works, Johnathan can get it in the mainline code.
Matt
Looks like the USRP1 code had the same problem, so I pushed a fix for
that as well:
http://gnuradio.org/cgit/matt.git/
on branch u2_xcvrfix
Matt
Hanwen,
Thanks for confirming the fix. The slope you see with decimation 5 is
indeed the fault of the CIC. Because 5 is odd, we can’t use a halfband
filter, and instead need to use the CIC for all decimation.
Decimation or Interpolation which is a multiple of 4 will be the
flattest, and multiples of 2 will be nearly as flat. Odd numbers will
always have that slope.
Matt