Scout_Regen_user.pdf

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1、 “Scout Regen” Shortwave Regenerative Receiver Dual band receiver covering 3.5 to 10 MHz Hendricks QRP Kits Hendricks QRP Kits “Scout Regen” SW Regenerative Receiver Version 1.2 5-01-09 Page 1 of 47 Table of Contents Introduction Note from Doug Posted to the Web April 21, 2009. 4 Acknowledgements. 5

2、 Brief Specifications. 5 Tools Needed. 5 Soldering tips. 6 First section Mounting the Battery Terminals. 10 Battery Section Tests. 14 Audio Amplifier Section. 15 Audio Amplifier Tests. 19 Regen Detector Section, Part 1. 22 Regen Detector Section, Part 1 tests. 28 Regen Detector Section, Part 2. 29 R

3、egen Detector Section, Part 2 tests. 31 Adding Decals to the Case. 32 Regen Detector Section, Part 3. 34 Regen Detector Section Part 3 tests. 43 Microphonic Effects. 44 Notes on Tuning a Regenerative Receiver. 44 Other Operating Notes. 45 Parts List by Schematic Reference Numbers. 45 Schematic. 46 L

4、ist of Figures Figure 1. Kit hardware. 8 Figure 2. Other electronic parts . 8 Figure 3. Kit Capacitors. 9 Figure 4. Chassis and decal sheet . 9 Figure 5. Wire used in the kit. 9 Figure 6. Top side view of the bare PC board. 10 Figure 7. Find the 9v battery “+” symbol as shown above. 10 Figure 8. Mak

5、e sure the battery + terminal is lined up right on the board . 11 Figure 9. Make sure the battery clip is installed flush to the top of the PC board. 11 Figure 10. Bottom view of the 9v battery connector pins. 12 Figure 11. Bend the leads on two of the 1N4004 diodes as shown. 12 Figure 12. Diodes D4

6、 and D1 mounted with band oriented marked. 13 Figure 13. When inserting the diodes, bend the leads outward to keep them in place for soldering . 13 Figure 14. Picture of soldered leads. 13 Figure 15. View of trimmed leads after soldering. 14 Figure 16. Measuring the voltage across the installed 9v b

7、attery. 14 Figure 17. Test points for voltage measurement. 15 Figure 18. Completed Audio Amplifier Section. 16 Figure 19. Mounted parts leads bent out to hold them into place prior to soldering. 16 Figure 20. D5, D6 band orientation shown. 16 Hendricks QRP Kits “Scout Regen” SW Regenerative Receiver

8、 Version 1.2 5-01-09 Page 2 of 47 Figure 21. Lead forming for R7 and R10 . 17 Figure 22. Resistor bodies R7, R10 flush with the PC board. 17 Figure 23. Orientation of IC1 dot marking and C13 polarity marking. 17 Figure 24. Polarity markings for C6 and C14. 18 Figure 25. Bottom side view of Audio amp

9、lifier section. 18 Figure 26. Measuring the voltage across the installed 9v battery. 19 Figure 27. Location of temporary lead scrap. 19 Figure 28. Measuring the current drain of the audio amplifier section . 20 Figure 29. Where to touch for the “hum test”. 21 Figure 30. Most of the electronic parts

10、on the right side of the board will be installed in this section. 22 Figure 31. C3 and C5 placed on the board. Do not solder! C3 trimmer setting. 22 Figure 32. Temporarily mount PC Board to the chassis and C3, C5 to the front panel. 23 Figure 33. Solder points shown for C3 and C5. 24 Figure 34. C3 a

11、nd C5 after soldering and trimming of bottom side leads. 24 Figure 35. Leading forming shown for the zener diode, D2. 25 Figure 36. Polarity of D2 and C9. 25 Figure 37. Comparison between a 1K resistor and a 1 mH molded choke. 26 Figure 38. D3 orientation shown. 1 mH choke and 1 K resistor shown ins

12、talled . 26 Figure 39. C3C before and after. Leads need to be straightened out. 27 Figure 40. Forming leads for C8. Leads spacing is too narrow. 27 Figure 41. Measuring the voltage across the installed 9v battery. 28 Figure 42. Measuring the current drain of the audio amplifier section . 28 Figure 4

13、3. In this section we will install most of the larger hardware pieces on the right side. 29 Figure 44. Close up of the two switches S1 and S3. 30 Figure 45. Q1 and Q2 mount with flat side matching the silk screen for the part. 31 Figure 46. Measuring the voltage across the installed 9v battery. 31 F

14、igure 47. Measuring the current drain of the kit to date section. 32 Figure 48. Location of the decals for the front panel. 34 Figure 49. Drilling template for L1, the regen main coil. Template is 1.5”x1.5” . 34 Figure 50. L1 drilling preparation. 34 Figure 51. Starting the bottom winding of L1 . 35

15、 Figure 52. Tying off far end of first winding of L1. 36 Figure 53. Start of L1 middle winding. 36 Figure 54. Tying off L1 middle winding. 37 Figure 55. Top winding of L1. 38 Figure 56. All six leads of L1 trimmed and solder tinned. 38 Figure 57. L1 Mounted in the PB board. 39 Figure 58. Cut five wi

16、res 2.5” in length and install on R6 pads. 40 Figure 59. R6 (back view/front view) mounted to the front panel. 41 Figure 60. Mount the PC board with the four corner screws. Keep screws loose!. 41 Figure 61. Mount C3 C5 to front panel. Keep screws loose! . 41 Figure 62. Mounting hardware for the shaf

17、ts for C3 and C5. 42 Figure 63. Knob order on the front panel. . 42 Figure 64. Measuring the voltage across the installed 9v battery. 43 Figure 65. Measuring the current drain of the kit to date section. 43 Hendricks QRP Kits “Scout Regen” SW Regenerative Receiver Version 1.2 5-01-09 Page 3 of 47 In

18、troduction Note from Doug Posted to the Web April 21, 2009 I have always had this love affair with Regen Radios. There is just something about them that fascinates me. I dont know why? Maybe it is because the operator has to operate or work at tuning in a signal. It takes a little bit of getting use

19、d to, but when you get it down, it is so much fun. You tune across the band. You hear a signal, adjust the regen control, retune, adjust the regen, retune with the fine tune, turn down the volume, Ahh there it is, two guys talking on 75 meters in the midwest and you are listening to them on a radio

20、that you built! It doesnt get any better than that. Maybe it does. It is even a bigger thrill when you hear a foreign broadcast station, or Arnie Coro and his DXers Unlimited SWL show from Radio Habana! So, I decided to kit one. I contacted Charles Kitchin (N1TEV) several years ago and asked him if

21、I could have permission to use his design in a regen kit. We would lay out our own board and make some minor changes, but it would be based on his circuit. Charles was very gracious and said go for it. What did I want the kit to be? I wanted it to have all through hole parts, battery and antenna con

22、nectors on board, and have its own case or chassis that was pre-punched, and I wanted it easy to build. Last fall at Pacificon, Dan Tayloe, Ken and I sat down and talked about the regen. I told them I wanted to add a regen kit to the lineup, and they agreed that it would be a good addition. I then a

23、sked Dan if he would do the board layout and Ken would handle the chassis design. They got together and went to work. In January, they had a prototype ready to go. It used a toroid for the main coil, and while it worked, it didnt work like we thought it should, and it was complicated. Since we wante

24、d this to be a simple kit for beginners, and especially aimed at boy scouts for the radio merit badge, we had to make some changes. Dan came up with the idea of using CVPC pipe as a coil form. It made the winding of the coil much easier to do, and was just what we needed. We made another round of pr

25、ototype boards and also ordered a prototype case. While we were at it, I asked Dan if we could add a 2.1 mm power connector along with the onboard battery clips since we had lots of room on the board. Sure, no problem and a good idea. (More on this later). We ordered another round of prototype board

26、s and I sent them to Dan, Chuck Adams and Jay Bromley to build and give us feedback. The board worked great. Chuck and Jay both were impressed with the receiver and Chuck even took a ton of pictures and put them on his website. These guys were building from just a schematic and a description of the coil winding, NOT a manual. But they are experienced builders and it was a snap to build. Both Chuck and Jay reported that they were spending way too much time pla