help me to understand TV modulator

It' kind of simple circuit from Elektor january 1985, that i found on https://members.tripod.com/~petlibrary/rfmod.htm
Is that colpitts oscillator with X1, C2, C3, T1 and? why is there L3?

**broken link removed**

If L3 is a part of colpitts how to ... put that to formula?
And than modulation... there's written:"the modulator allows a resolution of 80 characters per line"... which elements this depends on?
I guess C1 and C4 blocks DC, R4 gives output impedance, L4 is HF filter...
Are L1 and L2 just "blocking" inductors?... why then R1?
And the last why :roll: what is C5 for?

Any comments are welcome... Drej

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