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HIGH POWER SYSTEMS FOR WIND PROFILER

HIGH POWER SYSTEMS FOR WIND PROFILER. K. P. Ray. Society for Applied Microwave Electronics Engineering & Research IIT campus, Powai, Mumbai-400 076. 1.HIGH POWER TRANSMITTER 2.DUPLEXER. Transmitter Specifications : Frequency : 404.37 MHz Bandwidth :  500 kHz

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HIGH POWER SYSTEMS FOR WIND PROFILER

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  1. HIGH POWER SYSTEMS FOR WIND PROFILER K. P. Ray Society for Applied Microwave Electronics Engineering & Research IIT campus, Powai, Mumbai-400 076.

  2. 1.HIGH POWER TRANSMITTER 2.DUPLEXER

  3. Transmitter Specifications: Frequency : 404.37 MHz Bandwidth :  500 kHz Output power : 16 kW peak Duty cycle : 10 % maximum Pulse Width : 2 -16 s Pulse Repetition Time : 100 - 160s Harmonics : -30 dBc or better Spurious : -40 dBc Cooling : Forced air

  4. Main Subsystems: • HIGH POWER RF AMPLIFIERS • HIGH AND LOW VOLTAGE POWER SUPPLIES • RF CONTROL CIRCUITS AND DUAL DIRCTIONAL COUPLER • CONTROL AND INTERLOCK CIRCUITS

  5. BLOCK DIAGRAM FOR 16 kW PULSED TRANSMITTER

  6. HIGH POWER RF AMPLIFIERS

  7. FIRST OPTION OF 16 kW PULSED TRANSMITTER 43dB ~9.5 dB ~9 dB ~10.5 dB PDR DR HPA 16kW SSA 1mW 20W 225W 2kW

  8. 50 dB ~11 dB ~12 dB DR HPA 16kW SSA 1mW 100W 1kW SECOND OPTION ….

  9. MSA 1101 MSA 0520 MHW 720A1 MRF 393 BLOCK DIAGRAM FOR SOLID STATE AMPLIFIER

  10. SOLID STATE AMPLIFIER

  11. Frequency Response of SSA

  12. Measured values of Parameters for Solid State Amplifier • Output power : 100W Pulsed • Gain : 50 db • 3 db Bandwidth : >+/- 3 MHz • Efficiency : approx 40% • Harmonics/spurious : -40db • Dynamic range : > 5 db

  13. Design Philosophy of Distributed Matching Network for Triode Amplifiers Reactance provided by the tube capacitance Xc = j Zo tan (2/) L  The length 'L' of the tuned co-axial line is given by: L = /2 tan-1 Xc / Zo   Where  = wavelength in cm Xc = reactance due to the inter-electrode capacitance Zo = characteristic impedance of the line (ohm)  The  50  ohm matching point to tap-out the output  power  is given by: L2 = /2Ri/Rg . [Xc/(Xc2 + Zo2)1/2] cm Where L2 = distance from the short circuited end to the matching point. Ri = Output resistance (50 ohm in this case) Rg = grid resistance in ohms. Co-axial  structure with centre conductor having circular cross-section  and  outer conductor of rectangular  cross  section  are commonly used.

  14. FREQUENCY TUNING BY VARYING LENGTH

  15. FREQUENCY TUNING BY VARYING IMPEDANCE

  16. BIASING OF 2 kW TRIODE DRIVER AMPLIFIER Grounded Grid Configuration

  17. SCHEMATIC OF TRIODE AMPLIFIERS

  18. DRIVER AMPLIFIER CAVITY 3CPX800A7

  19. Frequency Response of a Driver Amplifier

  20. Pulse Response of a Driver Amplifier

  21. Harmonic Content of a Driver Amplifier

  22. HIGH POWER AMPLIFIER CAVITY 3CPX3500U7

  23. Frequency Response of High Power Amplifier

  24. Pulse Response of High Power Amplifier

  25. Harmonic Content of High Power Amplifier

  26. HIGH VOLTAGE AND LOW VOLTAGE POWER SUPPLIES

  27. Power Supply Requirement for Various Amplifier Stages • Solid State Amplifier: • 28 Volts DC Regulated • 12 Volts DC Regulated • Driver Amplifier: Plate Voltage: 3.5 kV DC Cathode Voltage: 10.0 Volts DC Filament Voltage: 13.5 Volts AC, 3.5 Amps • High Power Amplifier: Plate Voltage: 6.4 kV DC Cathode Voltage: 63.0 Volts DC Filament Voltage: 15.0 Volts AC, 13 Amps

  28. LOW POWER RF CONTROL CIRCUITS AND DUAL DIRCTIONAL COUPLER

  29. AUTOMATIC LEVEL CONTROL • oOutput power of an amplifier may change due to: • Change in ambient temperature, • Change in supply voltages. • Requirement : • Level Stability : < 0.1 dB for 1 dB change in amplifier gain

  30. BLOCK DIAGRAM FOR AUTOMATIC LEVEL CONTROL CIRCUIT

  31. FINAL OUTPUT RESPONSE OF THE TRANSMITTER

  32. DUAL DIRECTIONAL COUPLER

  33. CONTROL AND INTERLOCK CIRCUITS

  34. SAFETY INTERLOCKS FOR TRANSMITTER • AIR FLOW • CATHODE SUPPLY • PLATE VOLTAGE • EXCESS PLATE CURRENT • SSA OVERLOAD • DOOR • EXCESS REFLECTION

  35. Interlock Scheme for the Transmitter

  36. Display Indicators :-

  37. TEST RESULTS OF TRANSMITTER Parameters Specified valuesMeasured values Output power: 16 kW peak >16 kW peak Bandwidth: 0.5 MHz > 1 MHz Harmonics: -30 dBc > -38 dBc Spurious Level: -40 dBc -55dBc

  38. 16 kW PULSED TRANSMITTER

  39. DUPLEXER

  40. Specifications of Duplexer Total input power : 16 kW peak Average power : 1.6 kW Pulse width : 2 µs & 16 µs (coded) Transmit port Return loss : > 18.0 dB Transmit mode insertion loss : < 0.5 dB Receive mode insertion loss : <1.0 dB Transmit mode leakage (isolation) : 50.0 dB Min. Recovery time : 3 µs, however effort will be put to achieve 1 µs

  41. HIGH POWER BALANCED DUPLEXER

  42. HIGH POWER BALANCED DUPLEXER WITH INCREASED ISOLATION

  43. Antenna Rx BS LNA NC Tx +72dBm +72dBm 16kW DUPLXER LOAD CIRCULATOR AND DUPLEXER

  44. Antenna LOAD Rx BS LNA NC Tx LIMITER +55dBm +72dBm 16kW ~ 300W DUPLXER CIRCULATOR, DUPLEXER AND LIMITER

  45. THANK YOU

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