[Discuss-gnuradio] UHD Warning on ODD Interpolation

[embyte]

Hello list,

I have a graph consisting of a modulator mixed with a signal source, and 
a USRP sink.

I have it configured with a *sampling rate* of 720KHz.

When I run it, UHD fires the following warning (and transmission seems 
fine).

    The requested interpolation is odd; the user should expect CIC 
rolloff.
    Select an even interpolation to ensure that a halfband filter is 
enabled.
    interpolation = dsp_rate/samp_rate -> 89 = (64.000000 
MHz)/(0.719101 MHz)

What is this about? Thanks.