| 摘要 |
PURPOSE:To obtain a more effective jamming signal by generating a tuning voltage of a VCO with use of a voltage synthesizer. CONSTITUTION:After demodulation of a data signal from a center, said signal is inputted to a CPU1 and stored as PLL data in an ROM2 in accordance with the table of a jamming channel. The CPU1 fetches data in the ROM2 and supplies PLL data of one channel to a programmable divider 5. With locks of PLLs 4-9 a VCO8 comes to the jamming frequency concerned, while the output of an LPF7 is fixed as a tuning voltage of the channel. Then an A/D converting action by a CPU13 transfers the output voltage of the LPF7 to an RAM14. With the repetition of a similar action the tuning voltage of each jamming channel is set to the RAM14. Next the D/A converting action by the CPU13 obtains the tuning voltage of the VCO8 with respect to one channel in the RAM14. |
