Subject: TM742 freq extension .1

Original from JP1LRT to MODS


Hello!!!! I have recieved message from N8QXP Charles. He asked me mdification

of KENWOOD TM-742. I found it on radio magazine. The modification is very

simple. But my english is very very poor. I am afraid that you can not make

out. If you have any questions , please ask me again.  N8QXP charles saied

that he do not need graphics. But I need to graphics to explain. HI!



1. Open the lower panel of TM-742.



 ****** There are TWO version. Please check which version your rig is.******



                      FRONT PANEL IS UPER SIDE



      ___                               ___    ___    ___       <<<=== BAND SEL

   ---|-|-------------------------------|-|----|-|----|-|--------

  |                                                              |

  |______________*_______________________________*_______________|

  |     11                    2222                               |

  |    111                   22   22                             |

  |     11                      22                               |

  |11      22                                 |      

  |     11                   22222222                            |

  |                                                              |      

  |                                                              |      

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~





2.   ******  FOR OLD VERSION ******

     SEE THE POINT OF [ 2 ] .If you can find a small board masked with black

     sponge , your TM-742 is OLD VERSION.

3.   On right side small board , there are three lines. Make short circuit

     with midlle line and lower line.





2.   ****** FOR NEW VERSION ******

     SEE THE POINT OF [ 2 ] . If you can not find a small board , your rig is

     NEW VERSION.

3.   SEE THE POINT OF [ 1 ]. There is a chip [ 2R7 ] . And below this chip

     [ 2R7 ] , there are small chip [ 473 ] .  



          [ GRAPHIC IS FOR JA VERSION ]

      *-*-*-*-*-*-*-*

              R R R X            R =  chip [ 473 ]

      * * * * * * * *

      * * * * * * * *            Make short circuit two X point.

              X     R            Maybe on your TM-742,there are chip [ 473 ]

      *-*-*-*-*-*-*-*            with different patern. This graphic is for

                                 JA version.  So please try until modification

                                 will succeed.





OPERATION



1. ON 144MHz  PRESS BAND SEL MORE THAN 1SEC .   MODE CHANGE AM <-> FM.

2. ON 430MHz                 DITTO              BAND CHANGE 430 <-> 870

3. ON 1200MHz                DITTO                          1200 <-> 870

4. [F] + BELL  ->  REPEATER DUAL RCV.

5. 118-136MHz  MODE CHANG TO AM AUTOMATICALY.

6. X-BAND REPEATER OPERATION.     SELECT ONE BAND BY [BAND SEL]  SELECT ONOTHER

   BAND BY [CONT SEL].   PRESS [F] KEY MORE THAN 1SEC. PRESS [MUTE] KEY.

   X-BAND OPERATION WILL WORK.

   PRESS [F] THEN [MUTE] KEY -> CANCEL X-BAND REPEATER OPERATION.



73s                DE JP1LRT
                              YOSHIHARU "KEI" TSUKUURA