Dude, best of luck to ya but it prolly won't work. The RX stage of the circuit on the ZZ pcb has it's frequency determined by more than the inductor (you call it a coil). The inductor only varies the frequency off the main fundamental (be it 27, 40, 49Mhz, etc...) by a very small amount. So changing the coil prolly won't do that much.
The frequency is determined my several capacitors and a couple of inductors in the RX circuit.
See this thread at ausmicro for more info:
http://www.ausmicro.com/topic.asp?TO...+%2D+Technical
Best of luck to you!
ph2t.