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[Discuss-gnuradio] UHD Warning on ODD Interpolation

From: embyte
Subject: [Discuss-gnuradio] UHD Warning on ODD Interpolation
Date: Thu, 01 Aug 2013 14:16:20 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130701 Icedove/17.0.7

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.

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