| 摘要 |
A multi band radio employs frequency counters to determine a scaling factor during coarse tuning which is employed in a phase locked loop to control the frequency of a local oscillator during normal operation. Frequency counters count the frequency in the phase locked loop and in a low variable frequency generator to determine the rf frequency to which the receiver is tuned. Read only memories provide band and frequency displays with control signals based on the counted frequencies. |
