| 摘要 |
PROBLEM TO BE SOLVED: To prevent the harmful effects given to the images and voices in an inexpensive constitution when an RF modulator containing a PLL circuit and an RF modulator including no PLL circuit are produced respectively. SOLUTION: A printed board 11 is divided into the right and left half areas on its mounting surface centering on a shielding plate 12. Then each of these divided two areas includes a booster amplifier part 13, a modulation part 14 consisting of a modulation circuit 14a and a PLL circuit 15, and a crystal oscillator 16. Furthermore, a 1st terminal group including a video signal input terminal 1, an audio signal input terminal 2, a modulator power terminal (MD+B) 3, an idle terminal 4 and a booster power terminal (BST+B) terminal 5 is attached at the right side of the board 11 together with a 2nd terminal group including an SDA (data) terminal 6 used for the circuit 115, a CLK (clock) terminal 7, an idle terminal 18 and a TUNING (tuning) terminal 9 respectively. |
