Good day, we were tasked to design a transistor based RF oscillator to be used as a VCO for our design experiment. In the picture shown below I have seen many tutorials on how to set the L1, C2, C3 values. I also already know how to set R1 and R2 as they are only used to bias the transistor. I would just like to ask

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> What are the C1 and C5 capacitors, and the L2 inductor for and how do I set them to a certain value?
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[![enter image description here](https://i.stack.imgur.com/duppT.png)](https://i.stack.imgur.com/duppT.png)