Thank-you for posting the schematic.
The tap between the coils provides a reduced level of positive feedback from the collector to the emitter. You do not want the transistor to oscillate, instead you want it to almost oscillate then its gain is very high and the bandwidth of the LC is very narrow at its peak.
The tap between the coils provides a reduced level of positive feedback from the collector to the emitter. You do not want the transistor to oscillate, instead you want it to almost oscillate then its gain is very high and the bandwidth of the LC is very narrow at its peak.