| 摘要 |
<p>A UHF transmitter for digital TV signals includes, for example, twelve silicon carbide transistor RF output power amplifier panels (A1...A12) driven in parallel by two silicon carbide amplifier driver panels (D1, D2) and where each panel (D1, D2, A1...A12) is comprised of two modules (54, 56) each further including a 180° signal splitter (94, 96), a pair of quadraphase signal splitters (98, 100 and 102, 104) and combiners (106, 108 and 110, 112) a 180° signal combiner (114, 116), and five RF amplifier pallets (58...66, 68...76) which themselves are comprised of two silicon carbide transistors (124, 126) located on a common flange (128) and operated in push-pull relationship so as to suppress even order distortion products and reduce sensitivity to ground currents. A monitoring system (14), including a touch screen control display and control panel (20) senses the status of all assemblies so as to allow an operator to control the transmitter and inquire about the status of the various components and power supplies, and to replace one or more units (D1, D2, A1...A12) as required without the need for turning the transmitter off.</p> |
