Stephan, If you can't find it explicitly I strongly recommend you to measure it. What Poul-Henning suggested is about right, however you would like to have a FM detector (not AM or PM) of sufficient bandwidth. A frequency sweep through that should work well and display the amplitude responce vs frequency for the EFC input.
An alternative approach to a FM receiver is to generate the same frequency the oscillator is giving and then mix them together. This gives you the PM (make sure they are at or near beating). A simple diffrentiator circuit will allow you to monitor the frequency modulation rather than phase modulation. For a 100 MHz oscillator, and for expected audio frequency modulation cut-off a standard FM radio might actually be all that you need. You can use a spectrum analyzer if you have one around. The methods really depends on what tools you have at hand. Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
