| 摘要 |
<p>A transmitter controller (50) comprises a synthesiser (52), a voltage controlled oscillator (54), a signal processor (56), a crystal (58) and a variable capacitor (60). Data to be transmitted enters the system at 62. The data is scale data in the form of a series of 1's and 0's. The frequency at which the crystal (58) oscillates remains constant throughout transmission. The variable capacitor (60) is used to initially tune the crystal. The synthesiser comprises a first 'divide by' (64) and second 'divide by' (66). The first divide by (64) is used to process scale data and the second divide by (66) is used to process the reference data from the crystal.</p> |
