i had encountered few things While doing EMC RE Measurements.
i have seen emissions (Amplitude dBµV/m) emitting at particular frequency (lets say at 750 and 800MHz) therefore i calculated the single frequency which is usually referred to as the fundamental frequency or sometimes the first harmonic.
So for example my fundamental frequency of clock oscillator is 50MHz (measured 40dBµV/m) 15th harmonic is 750MHz (50dBµV/m) is and 16th Harmonic is 800MHz (dBµV/m)
So now i am pretty sure from which part the emission is coming from DUT but my question is Why the emissions are low at 50MHz and high at 750 and 800MHz if i assume its coming from a single component why the emissions are different at different frequencies
i have seen emissions (Amplitude dBµV/m) emitting at particular frequency (lets say at 750 and 800MHz) therefore i calculated the single frequency which is usually referred to as the fundamental frequency or sometimes the first harmonic.
So for example my fundamental frequency of clock oscillator is 50MHz (measured 40dBµV/m) 15th harmonic is 750MHz (50dBµV/m) is and 16th Harmonic is 800MHz (dBµV/m)
So now i am pretty sure from which part the emission is coming from DUT but my question is Why the emissions are low at 50MHz and high at 750 and 800MHz if i assume its coming from a single component why the emissions are different at different frequencies