rx/tx 140-174 MHz and rx/tx420-470 MHz:

DISCLAIMER: PERFORM THIS PROCEDURE AT YOUR OWN RISK. THE POSTER(S) OF

THIS PROCEDURE ASSUME NO LIABILITY, AND THIS PROCEDURE IS POSTED FOR

GENERAL INFORMATION ONLY. THE FT-51R RADIO IS NOT FCC-TYPE ACCEPTED FOR

TRANSMISSION OUTSIDE OF THE AMATEUR RADIO FREQUENCIES. THIS MODIFICATION

ENABLES TRANSMISSION ON FREQUENCIES OUTSIDE OF THE AMATEUR RADIO BAND, AND

IS LEGAL FOR THOSE INDIVIDUALS WITH MARS/CAPS CERTIFICATES. THIS MODIFICATION

REQUIRES THE USE OF A LOW POWER FINE TIP SOLDERING IRON. INDIVIDUALS WHO ARE NOT

EXPERIENCED WITH SOLDERING OF SURFACE MOUNT TECHNOLOGY SHOULD NOT ATTEMPT

THIS MODIFICATION, YOU COULD RUIN YOUR RADIO

1. Remove the battery pack from the radio.

2. Remove the four screws directly beneath the battery pack on the radio.

3. Remove the two screws holding the contact portion of the battery compartment.

4. Remove the screw and battery pack release lever. (the following steps make removal of the battery holding

compartment easier)

5. Remove the four screws on the bottom portion of the back of the cabinet. Carefully remove the two halves of the radio. Pay attention to the gasket as you are seperating the cabinet.

6. Remove the battery pack holding compartment. The section you will know be working with is directly underneath the

battery pack holding compartment (behind the touch tone pad).

7. There is a ribbon cable connected to the control board. You can leave the ribbon cable attached if you're a GOOD

solderer, or you can release the two little black levers on each side of the ribbon cable and CAREFULLY slide the

ribbon cable out of the socket and hold it back towards the case with a piece of tape. Be careful not to put a bend

in the ribbon cable or pierce it.

8. Locate a set of etched jumpers on the pc board. They are located adjacent to the bend in the ribbon cable.

They are not marked, and are situated as follows (o-o indicates closed, o o indicates open):

JP1001 o-o

.....................o o JP1005

JP1002 o o

.....................o o JP1006

JP1003 o o

.....................o-o JP1007

JP1004 o-o

9. Using solder wick or your preferred method of solder-removal, carefully remove the jumper for JP1007.

This enables the 134-174, 420-470 MHz transmit.

10. Reassemble the radio, remembering to reinstall the gasket, and to carefully reinsert the ribbon cable if you

removed it from the socket, and fasten down the little black socket locks.

11. Press the MHZ /\\ and MHZ \\/ buttons simultaneously while turning the power on to the radio.

This enables the modification.

Some notes: I experimented with removing JP1004, and it had no apparent effect. I did not experiment with any

of the other jumpers except JP1007. There still may be 800 MHz receive buried some where in ther radio, the

Japanese version has 800 MHz receive.