Can harmonic happen at 1/2f?

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sleepy04 said:
It shows 0.731uH. More than 2 times the calculated value.
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Please put your inductor standing up; the PCB pads down below are overloading the inductor. If possible, raise it 2-3 mm off the board. Hopefully your problem will disappear.
 
My FM transmitter has its coils spaced above the circuit board.
 

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betwixt said:
True.... but from a single common base oscillator stage with no other tuned circuits around it ???

Brian.
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Oh yeah! Trust me on this one.

The weirdest one I ever saw was a non harmonic spur caused by an RF signal bouncing off of an amplifier input, and generating the spur. Took a while to find that one.
 

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