Evolution of high power am transmitter technology
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The document discusses the evolution of high-power AM transmitter technology, comparing the S7HP and TMW2100 transmitters, focusing on modulation efficiency and power output. Key advancements include improved modulator designs, high-speed switching using MOSFETs, and the implementation of DSPs for control functions. The differences between the two models are highlighted in their electronic designs, connection topology, and power module outputs.
Evolution of high power am transmitter technology
- 1. Evolution of High power AM transmitter technology and Comparison of type S7HP and TMW2100 transmitters
- 2. AM-DSB modulation in communication AM is the least efficient mode of communication Hence, the process of generation of high power AM-DSB signals needs to be highly efficient
- 3. Evolution of AM Transmitter technology Class-C PA and Class-B modulator using triodes Class-D PA and Class-B modulator using tetrodes PSM modulator using GTOs replaces Class-B modulator Dynamic carrier control for electrical energy saving MOSFET as high speed switching element and DSP to implement the switching algorithm
- 4. Connection topology of RF modules in series DSPem Ec
- 5. Connection topology of RF modules in parallel
- 6. Connection topology of RF modules in series || parallel
- 7. Comparison of the topology S E R IA L P A R A L L E L M IX E D O P E R A T IO N M O D U L E V O L T A G E A D D E D S A M E C U R R E N T M O D U L E C U R R E N T A D D E D S A M E V O L T A G E M O D U L E V O L T A G E A N D C U R R E N T A D D E D A N D C O M B IN E D S T A B IL IT Y W IT H O N E O R M O R E M O D U L E O U T O F O R D E R S T A B L E P O W E R D E C R E A S E S U N S T A B L E P O W E R R E M A IN S C O N S T A N T S T A B L E U N D E R C O N D IT IO N S M A L L U N B A L A N C E D V O L T A G E D IF F E R E N C E D IS A B L E D M O D U L E M O D U L E F A U L T A L L O W E D S H O R T - C IR C U IT T H E N O R M A L T R A N S IS T O R F A IL U R E M O D E O P E N C IR C U IT N E E D A D D IT IO N A L P R O T E C T IO N S H O R T C IR C U IT L IM IT E D N U M B E R O F F A U L T Y M O D U L E L IM IT E D L IM IT A T IO N H IG H V O L T A G E L IN E L E N G T H L O A D V A R IA T IO N H IG H C U R R E N T L O W IM P E D A N C E IN C R E A S E D L O S S E S V O L T A G E A N D C U R R E N T C O M B IN E D T H O M C A S T S O L U T IO N 1 2 0 T O 1 6 0 M O D U L E S IN S E R IA L 1 5 0 k W N IL 2 L IN E S O F 1 2 8 M O D U L E S IN S E R IA L 4 0 0 k W P H A S E V A R IA T IO N A L L O W E D F O R B ID D E N A L L O W E D
- 8. Comparison of S7HP and TMW 2100
- 9. Similarities in S7HP and TMW 2100 The electronic designs are very much similar Solid state modules are used in RF power building Uses MOSFETs as high speed Switching devices in a H-bridge configuration for developing the final RF power Uses DSP processors for implementing the algorithms for module switching, thermal balancing, rotation etc No hot plugging of PA modules Uses phase modulation to get fine envelope Control through MMI, remote terminal etc Boards are not inter-changeable Built in DCC DRM ready
- 10. Differences in S7HP and TMW 2100 PA connection topology Series – parallel Series Cooling Water and air Air Phase control 7 Dedicated PAs All PAs Signal distribution Through distribution board one each for 16 modules Through distribution board one for block of each 5 modules
- 11. Differences in S7HP and TMW 2100 Power output of each module 2.34 kW 1.25 kW Number of PAs 255 80 PA Module monitoring Through fuse status Through fuse status and differential phase of I/P and O/P signals Power build up 239 CSM controlled PA All 80 are CSM cum phase controlled
- 12. 5 kW Power pack of TMW2100
- 13. Schematic of PA used in TMW 2100
- 14. Timing diagram of the control signals fc+ and fc- in PA module of TMW 2100
- 15. Schematic of PA used in S7HP