Radio Mods Database

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                              TH75-A MARS/CAP MODIFICATIONS

This modification will allow the TH-75A to transmit from 142 to 152 MHz and
420 to 450 MHz. Specifications are guaranteed for the Amateur bands only.
Though the transceiver will display 136 to 174 MHz and 335 to 512 MHz, the
PLL circuit may not lock through the entire range.

MODIFICATION PROCEDURE :

1. Disconnect the battery and antenna.

2. Remove the three case screws and two battery plate screws.

3. Lift the front panel from the body of the transceiver, but do not
disconnect the two flex cables.

4. Cut the green jumper wire (W1) that is located to the left side of the
CPU in the front panel assembly.

5. Assemble the transceiver by reversing steps 1 - 3.

6. Reset the CPU by holding the M key as the power is turned on.


I have a couple of mods that you may or may not have. For the TH-75A MARS/CAP mod, removing D4 will allow TX across entire tuning range, except that
actual TX range will be limited by tuning of the PLL.
                             

All the mods are captured by Packet. 
KB2LJJ    Radio Mods Database 
take now responsibility or liability for any 
damage resulting from this modification.  
                                  
 I have been trying to help our ham radio with the radio modifications and have asked for any type of new radio mods.
 However, I haven't received too many.  If all of you contributed a little more,  I believe I would be able to help 
all the other ham's that are looking for these mods. I know it is possible to get more mods from all the Ham's because of
 the wide range that exist throughout the world.  By doing this we can  flourish and enjoy more of this hobby that 
we've taken part in for so many years. Furthermore, I ask you not to forget to send me any modifications that you might
 have through email.  I would really appreciate it.

      Email                kb2ljj@pacnews.com

 73's
   John Ribeiro
             KB2LJJ