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  1.  
  2.                          APPENDIX C 
  3.  
  4.  
  5.                 1278 ADJUSTMENT LOCATION MAP
  6.  
  7.  
  8. This  is  a map of the physical locations of the  adjustment 
  9. potentiometers on the 1278 circuit board.  They are shown as 
  10. they  appear when looking down on top of the board with  the 
  11. board oriented so that the rear panel connectors are to  the 
  12. left.  Information in the boxes is organized as shown below.
  13.  
  14.  
  15. ________________           ________________________________
  16. |               |          |               |               |
  17. | PART   MODE   |          | PART MODE H/L | PART MODE H/L |
  18. |               |          |               |               |
  19. | CALSET   #    |          | FREQ / CALSET | FREQ / CALSET |
  20. |               |          |               |               |
  21. -----------------          ---------------------------------
  22.  
  23.  
  24.  
  25.  
  26.  
  27.    DEMODULATOR                          MODULATOR
  28.  
  29. ________________            ______________________________
  30. |               |           |              |              |
  31. | R113    HP    |           | R106   HP L  | R77    VP H  |
  32. |               |           |              |              |
  33. | CALSET  32    |           | 2120   248   | 2100   250   |
  34. |               |           |              |              |
  35. -----------------           -------------------------------
  36. |               |           |              |              |
  37. | R114    VB    |           | R122   VB L  | R105   HP H  |
  38. |               |           |              |              |
  39. | CALSET  32    |           | 2125   248   | 2320   227   |
  40. |               |           |              |              |
  41. -----------------           -------------------------------
  42. |               |           |              |              |
  43. | R79     VP    |           | R78    VP L  | R119   VB H  |
  44. |               |           |              |              |
  45. | CALSET  8     |           | 1300   404   | 2975   177   |
  46. |               |           |              |              |
  47. -----------------           -------------------------------
  48. |               |           |              |              |
  49. | R115   CW     |           | R138 SSTV H  | R129   MCW   |
  50. |               |           |              |              |
  51. | NO CALSET     |           | 1500   351   | 850    618   |
  52. | SEE NOTE      |           |              | SEE NOTE     |
  53. -----------------           -------------------------------
  54.  
  55.                   NOTES ON FOLLOWING PAGE
  56.  
  57.  
  58.   NOTE!  Separate  procedure required to do alignment of  CW 
  59.          demodulator center frequency.
  60.  
  61.   NOTE!  MCW   modulator   tone  is  also  used   for   SSTV 
  62.          transmission.  However, CW receive through a narrow 
  63.          filter  for  HF  CW operation will require  the  CW 
  64.          demodulator  center  frequency to  be  selected  to 
  65.          align  with  the  radio's  filter  passband.    MCW 
  66.          operation on VHF FM will require that both stations 
  67.          have both the modulator tone and demodulator center 
  68.          frequency to the same frequency.   Depending on the 
  69.          mode  you feel is most important to you,  a  choice 
  70.          will  have  to  be made that can  adversely  affect 
  71.          operation on the other modes (SSTV, MCW, or CW).
  72.  
  73.