| 摘要 |
FIELD: video surveillance technologies. ^ SUBSTANCE: cable transmitter has serially connected modulator, which is meant for converting television low-frequency spectrum to radio-frequency, harmonics filter, high frequency amplifier and attenuator, and also power-feeding system filtering block, while output of cable transmitter is made with possible switching to input of ranges adding block of unified television main, formed by coaxial cable. ^ EFFECT: higher efficiency. ^ 3 dwg |
