I am trying to use the oscillator described in "Experimental Methods In RF Design" book page 4.9 fig 4.13 C. I have attached a drawing here. Sorry for the bad drawing. The values inside the brackets are actual values that I have used in my circuit. Now the problems are:
Whenever I bring my hand near to the oscillator, its frequency changes considerably. This is very annoying. How to stop that? I know this is due to the capacitance of my body, but there must be some way to stop this as professional designs does not behave like this. There must be some standard way to stop this.
I don't understand how to take the output from this oscillator. I tried two points marked A and B in the circuit. If I take the output from point A, then it shows harmonics as seen from my scope picture. How to stop these harmonics?
If I take the output from point B, then it looks OK but the frequency again changes considerably. So how should I take the output from this oscillator?
Also I need suggestions about a buffer amplifier for this oscillator.