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Text File  |  1997-02-01  |  4KB  |  74 lines
  1. copied from Internet netnews:
  2. From: kurt@cs.tamu.edu (Kurt Freiberger)
  3. Newsgroups: rec.radio.amateur.misc
  4. Subject: THE REAL Standard 558 radio mod
  5. Keywords: Standard C558A extended transmit
  6.  
  7. >From a sheet that I got from a vendor, here 'tis:
  8.  
  9. MARS/CAP (Wide band transmit)
  10.  
  11. 1. Remove battery and antenna.
  12. 2. Remove front case assembly block by unscrewing.
  13. 3. Remove tthe copper plate around the back side of the display section.
  14. 4. Remove the diode indicated by D2, and add a diode 1SS301 leaving other
  15.    components intact as per the following drawing.
  16. 5. Reassemble radio and install battery.
  17. 6. Turn on power and execute master reset.
  18.  
  19. ---------------------------------------------------------------------
  20. ------------+             +------------------------------------------
  21.             !             !
  22.             !           +------+         (PC board "donut")
  23.             !           !      !                /
  24.             +-----------+      +------+        / 
  25.                         !      !      !   /---\
  26.    PC board trace/      !   D1 !      +--+ +++ !      +-----+
  27.    component layout     !      !      +--+ +++ !      !     !
  28.             +-----------+      !      !   \+-+/ +-----+-+   !
  29.             !           !      +------+    ! !  !       !   !
  30.             !           +-+----+         +-+ +--+       +---+
  31.             !             !              !      !       !     <<< ---- CHANGE
  32.             +-------------+              !      !  D2   !
  33.                                          +------+       +---+
  34.                                                 !       !   !
  35.                                                 +-----+-+   !
  36.     "Not to scale"                                    !     !
  37.                                                       +-----+ 
  38.                                              **
  39.                                              **
  40.                                             \**/
  41.                                              \/
  42.                +--------+                 (about here)    +------------+
  43.                !        !                                 !            !
  44.                +--+     !                  +----+         !            !
  45.   PC board locator!     +-----------------/------\--------+            !
  46.                +--+                                                    !
  47.                !                                                       !
  48.                !                                                       !
  49.                !                                                       !
  50.                ++                                                +-----+
  51.                 !                                                ! 
  52.                ++                                              +-+
  53.                !                                               !
  54.                !                                               !
  55.                !                                               !
  56.                !                                               !
  57.                !                        Opening for            !
  58.                !                        speaker about          !
  59.                !                        here (funny            !
  60.                !                        shaped opening)        !
  61.                 ...............................................
  62.  
  63. I received the diode yesterday, and installed it.  The mod DOES work!!!!
  64. I have not tested the ranges, but it DOES cover the entire 420-450 band
  65. now, which is what I was most interested in.  
  66.  
  67. 73/Kurt
  68. -- 
  69. Kurt Freiberger, wb5bbw   kurt@cs.tamu.edu 
  70. ============================================================================
  71. Note: I haven't tried or verified this, proceed at your own risk.  And
  72. do not transmit outside of legal bands!  WA2ISE
  73. /EX
  74.