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Text File  |  1994-06-04  |  5KB  |  67 lines
  1.  
  2.  
  3.  Sb: MODIFICATION OF TS-450SAT 
  4.  
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  6. [                                                                            [ 
  7. [  GENERAL COVERAGE TRANSMISSION MODIFICATION FOR THE TS-450 AND TS-690      [ 
  8. [  DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD     [ 
  9. [  A) Remove all screws of top and bottom case.                              [ 
  10. [                                                                            [ 
  11. [  B) Remove two screws of front panel (left and right top side),and loosen  [ 
  12. [     two screws of front panel (left and right bottom side).  Now gently    [ 
  13. [     pull out the front panel about a quarter inch and then tilt it down,   [ 
  14. [     so you can get to the digital unit board located behind the panel.     [ 
  15. [                                                                            [ 
  16. [  C) Remove all screws of digital/PLL unit (X46-312X-XX or X50-3150-xx).    [ 
  17. [     Gently unplug the connectors at the top of the board so that you can   [ 
  18. [     rotate it forward to get to D27 (see E below) which is on the rear of  [ 
  19. [     the board.                                                             [ 
  20. [                                                                            [ 
  21. [  D) Cut the chip diode D21 (RL73) on digital unit front side for 30-40 mHz [ 
  22. [     receive only (no transmit).  WARNING: if you cut this diode, though,   [ 
  23. [     you will decrease maximum output power from 27.5 to 30 mHz by half to  [ 
  24. [     a maximum of 50 watts (!) and FM on all bands to a maximum of just     [ 
  25. [     10 watts (!)  so I don't recommend this diode be cut, even though      [ 
  26. [     it can be done and it's easy to get to  There's nothing much worth     [ 
  27. [     listening to between 30 and 40 mHz anyway.                             [ 
  28. [                                                                            [ 
  29. [  E) Cut the chip diode D27 (RL73) on digital unit rear side for general    [ 
  30. [     coverage (1.620 to 29.999 mHz) transmit.  (If you decide to do the     [ 
  31. [     30-40 mHz receive mod described in D above, you still won t be able to [ 
  32. [     transmit 30-40 mHz by clipping diode D27, by the way.)  I recommend    [ 
  33. [     this mod, even though the diode is sometough tough to get to.          [ 
  34. [                                                                            [ 
  35. [  \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\                  [ 
  36. [  [      \\                                              [                  [ 
  37. [  [   \__  __\                                           [                  [ 
  38. [  [  \_ Bat. _\                                          [                  [ 
  39. [  [   [      [                                           [                  [ 
  40. [  [    __\\__                 \\\\\\\\\\\\               [                  [ 
  41. [  [              \\\\\        [          [               [                  [ 
  42. [  [    [_\_[     [   [        [          [               [                  [ 
  43. [  [    [   [     [ \ [        [          [      ->I- D27 [ <---GEN CVG      [ 
  44. [  [    [   [     __ __        [\\\\\\\\\\_      ->I- D26 [                  [ 
  45. [  [    [\\\[                                    ->I- D25 [                  [ 
  46. [  [                                             ->I- D24 [                  [ 
  47. [  [                                             ->I- D23 [                  [ 
  48. [  [                                             ->I- D22 [                  [ 
  49. [  [                                             ->I- D21 [ <---30-40 mHz rx [ 
  50. [  [                                             ->I- D20 [                  [ 
  51. [  ________________________________________________________                  [ 
  52. [      DIGITAL JNIT (X46-312X-XX)     Component side view                    [ 
  53. [                                                                            [ 
  54. [  These modifications are at your risk.                                     [ 
  55. [                                                                            [ 
  56. [  Clipping D27 is recommended for both the TS450S and TS690S.  However,     [ 
  57. [  clipping D21 is not recommended (see  D  above) since it decreases output [ 
  58. [  power on 10 meters as well as enabling 30-40 mHz receive!!!  (Keep in     [ 
  59. [  mind that this is unnecessary AND ill advised on the TS690S since it      [ 
  60. [  already receives continuous to 60 mHz.                                    [ 
  61. [                                                       -- WA4FJF            [ 
  62. [\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\[ 
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  64.  EOF 
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