I have been doing a little bit of reading, from real books this time, and it seems this thread would be coming to an abrupt end because of that.
This circuit is probably "as good as it gets" for a simple circuit using a LC oscillator.
I still have questions though:
1. audioguru said that the stage 3 transistor Q3 is biased crudely.
Why not bias it properly then?
Or is there a reason why it should not be biased so?
2. Why not remove the stage 3 tank? I mean remove L2 and C13 completely.
Would it affect the transmission in any way (maybe send out more harmonics, but if we operate the unit completely from 5V, the power of the harmonics would be sufficiently reduced)