PicoSat TT&C Hardware design

1. PicoSat TT&C Hardware design 2005.04.21 EE/劉錦文 liu_cliff@nspo.org.tw

2. TT&C 架構圖 Transponder Modem UHF/VHF Antenna CW circuit Morse Code I/P CW 29MHz Antenna

3. Block diagram-Modem FSK Modulator Matching circuit RF module OBMU OSC. Control control Mod/DeMod FSK DeModulator

4. Block diagram-Transponder Reset control Rreq. control Band select Matching circuit Antenna RF module VX-1R MODEM Divider Combiner Antenna DC monitor PTT

5. Block diagram-CW DC OBMU Control Switch Antenna Driver Osc. Amplifier Amplifier Matching Circuit

6. Interface Reset control Rreq. control Band select DC monitor CW Antenna Data in TT&C Transponder VHF Antenna Data out GND CW control DC +5V DC +3.6V GND

7. TT&C schematic-all 已有修正

8. TT&C schematic-Pin assignment

9. TT&C schematic-FSK modulator

10. TT&C schematic-FSK demodulator

11. TT&C schematic-FM radio

12. TT&C schematic-Divider/ Combiner

13. Divider/Combiner simulation(1) • Simulator • Microwave office 4.0 • Theoretical • Wilkson power divider, ref.Microwave engineering/Pozar

14. Divider/Combiner simulation(2)

15. RF module for transponder

16. Structure by Photo-PCB

17. RF module&Modem mounting

18. RF module control signal wiring

19. Component modify

20. VHF antenna test set

21. CW antenna test set

22. Structure by Photo-YamSat

23. Test-Test record

24. Test-Spurious fail record

25. Test-VHF modulation record

26. End to end test (1) • Frequency : 145.85MHz • Bit rate : 1.2kHz • Test Item : Free space 145.85MHz interference at HsinChu. • Location : 南寮 • Distance : 1km • Date : 10/4’2001

27. End to end test (1)-Test result • VHF • Command BER > 10-6 • Telemetry BER >10-6 • CW • Morse code decode during test period: 95% • Conclusion • Very good a test result.

28. End to end test(2) • Location • Ground Station at NSPO’10F • Latitude: 24o47’02.4” • Longitude: 121o00’07.04” • The height above mean sea level : 150m • Beacon site at NSPO’10F • Distant of ground station 25m. • 湖口休息站 • Latitude: 24o51’35.8” • Longitude: 121o00’43.0” • The height above mean sea level : 195m • Distant to Ground Station 8.68km

29. Test result summary • VHF • Frequency 145.85MHz • Real test path loss: 133~142dB • The 600km orbital height max. space loss = 145dB • The theoretical value of path loss: 99dB • Performance of data package • 50% successfully received • Amateur radio to estimate are “Acceptable”.

30. CW Hardware Design 國家太空計劃室 Continue Wave (CW) Transmitter Design & Measurement Section : TT&C By :Yuga_Hsu Date : 2005/04/21

31. Overall 國家太空計劃室 • What's Continue Wave • CW Specifications • Transmitter Configuration • Oscillator Circuit • Amplifier Circuit • Low Pass Filter Design • Power Splitter Design • Output power Measurement

32. What's Continue Wave 國家太空計劃室 • 波的頻率和振幅是固定不變的 • 特殊的節奏斷續發射電波 • 也是屬於一種調制的方式 • 電路相當簡單，容易製作 • 干擾很多的狀況下比語音容易分辨 • 有較長通訊的距離

33. CW Telemetry Data 國家太空計劃室

34. Specifications 國家太空計劃室 Frequency 29.49MHz Output power 200mW/each port Filter loss < 2dB Splitter loss < 3.5dB Max. Spurious output < -50dBc Frequency stability ±25Hz/day

35. Transmitter Configuration 國家太空計劃室 Ant2 Ant1 Splitter Filter Crystal Oscillator 1th Amplifier 2th Amplifier

36. Oscillator Circuit 國家太空計劃室

37. Amplifier Circuit 國家太空計劃室

38. TheAmplifier Output Voltage 國家太空計劃室 F=29.48MHz 4.96V

39. The Amplifier Circuit 國家太空計劃室 2S1971/0

40. Low Pass Filter Design 國家太空計劃室 Microwave Office Simulation

41. Low Pass Filter Simulation 國家太空計劃室 Simulation Result

42. The Filter Circuit 國家太空計劃室

43. Amplifier Output Without Filter 國家太空計劃室 29.49MHz 24.06dBm

44. Amplifier Output With Filter 國家太空計劃室 29.49MHz 22.06dBm

45. Power Splitter Design 國家太空計劃室 Microwave Office Simulation

46. Power Splitter Simulation 國家太空計劃室 Simulation Result

47. The Splitter Circuit 國家太空計劃室 Ant 1 RF in Ant 2

48. CW Transmitter Schematic 國家太空計劃室

49. The Circuit Outline 國家太空計劃室

50. The CW Layout Design 國家太空計劃室 Protel_PCB Layout