Post by Admin on Apr 25, 2014 12:40:23 GMT
It has been reported that a simplified method for tuning Class E transmitters is to resonate the system, while maintaining the allowable input power, and to then "back-off" the resonating capacitor a bit effectively placing the system slightly off resonance. This method bypasses using an oscilloscope to observe for proper Class E waveforms.
I will be setting up a Class E transmitter soon and was curious to know if that procedure produces the maximum output (while being limited to 100 mW input) or is there some other reason to operate off resonance.
Operating an HF amateur station, I have noticed that when you "dip and peak" a PI-filter output when tuning up, maximum output doesn't always occur at resonance. I always assumed this had something to do with the impedance and SWR of the antenna system.
If maximum efficiency occurs slightly off resonance for Class E, would the likelyhood of harmonic output be greater? I guess I'll find out when I start tinkering with my Class E transmitter.
I will be setting up a Class E transmitter soon and was curious to know if that procedure produces the maximum output (while being limited to 100 mW input) or is there some other reason to operate off resonance.
Operating an HF amateur station, I have noticed that when you "dip and peak" a PI-filter output when tuning up, maximum output doesn't always occur at resonance. I always assumed this had something to do with the impedance and SWR of the antenna system.
If maximum efficiency occurs slightly off resonance for Class E, would the likelyhood of harmonic output be greater? I guess I'll find out when I start tinkering with my Class E transmitter.