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This circuit uses a saw based oscillator with an output amplifier which drives a transistor. C1 and C2 and L1 are critical oscillator components. They form a tank circuit which should be tuned to the resonator frequency. Typically C1<C2. The output C/L network matches the antenna to the driver.
The tank circuit frequency has the following equation:
Rearranged for L:
L=1/( (2*PI*F)^2 * C1*C2/(C1+C2))
The following calculator can be iteratively used to find appropriate values for the tank circuit.
Saw Transmitter Schematic
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