This is a site for users of the Perseus SDR receiver who want to measure exact frequency offsets from recorded files. Up to the current version 2.1f (Sep 2009) it is not possible to calibrate the recordings within the software. So you need to calculate. If you know the receiver's offsety of at least two frequencies you can calculate the rest. This little script makes it easier. I've already calibrated some of the public files, or you can use the form.

Calibration tables for of public files



the WAV files are available at


Individual calculation


1st Frequency KHz
1st detuned by Hz

2nd Frequency KHz
2nd detuned by Hz


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