INDEX:

01. SR-2000 test specifications

02. Tour of the "C" level schematic              Copy of SR-2000 level "C" service manual

03. TOUR OF RECEIVE CIRCUIT

04. 1st R.F. stage 12DK6 (V1)

05. 1st receive mixer 7059 (V2A) [Signal + Heterodyne]

06. Heterodyne oscillator (V12)

07. 1st I.F. amplifier 7059 (V3A) [6.0Mc to 6.5Mc]

08. 2nd receive mixer 12AT7 [1.65Mc + (4.35Mc to 4.85Mc)]

09. VFO (V13 oscillator and V4B amplifier) [4.35Mc to 4.85Mc]

10. I.F. amplifier/receive noise blanker 6GX6A (V6) [1.65Mc]

11. Noise amplifier 7059 (V5A)

12. Noise pulse generator 5059 (V5B)

13. Crystal filter circuits and logic

14. 3rd I.F. amplifier 7059 (V7) [1.65Mc]

15. Product detector/1st audio amplifier 12AT7 (V9A)

16. Carrier oscillator 12AT7 (V14A) [1.648550Mc LSB) (1.651550Mc USB) (1.651470Mc TUNE/CW]

17. Audio amplifier/gate switch 6AQ5A (V15)

18. AGC amplifier and circuits 7059 (V8A)

19. Comprehensive discussion of the receive logic

20. Post production changes will be added at the conclusion of the standard level tutorial

30. Transmit circuits and logic

31. 1st Audio amplifier 12AT7 (V19A)

32. 2nd Audio amplifier 12AT7 (V19B)

33. 3rd Audio amplifier 12AT7 (V14B)

34. Balanced mixer 1N87 pair [1.65Mc Carrier + Audio]

35. Carrier oscillator 12AT7 (V14A) [1.648550Mc LSB) (1.65155Mc USB) (1.651470Mc TUNE/CW (SR-2000)]

36. I.F. amplifier 6GX6A (V6) --- [1.65Mc]

37. Crystal filter circuits and logic [1.65Mc]

38. 1st Transmit mixer 7059 (V2B) (VFO + Carrier)

39. 1st transmit I.F. amplifier 7059 (V3A) --- [(6.0Mc to 65Mc) and AALC detector (V3B)]
40. 2nd transmit mixer 7059 (V11A) [6.0Mc to 6.5Mc + Heterodyne oscillator]

41. Transmit driver 12BY7A (V18)

42. Final amplifiers 8122 (V16 and V17)

43. Comprehensive discussion of transmit logic

44. Post production changes will be added at the conclusion of the standard level tutorial

45

46

47

48

49

50