In the MAX1470 Typical Applications Circuit, the tank component values are 27nH and 4.7pF for 315MHz. A quick calculation indicates to me that for the tank to resonate at 315MHz these values should be higher. What gives?
You're right. The calculations take into consideration about 5nH of stray inductance and 4.0pF of stray capacitance. These values are based on the MAX1470 Evaluation kit (MAX1470EVKIT), but will obviously be layout dependent.
