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
SOURCE: The QRZ Windows Ham Radio CDROM |
