DR-599 and DR-600
 

Remove the 4 screws -- two each side. Hold the control head against the unit.
 Remove the two screws on the control head together.
 With car separate the back and front cover of the control unit.
 Cut the Red wire for the Aircraft reception and 800 Mhz band.
 Cut Blue wire to expand the TX / RX frequencies range.
 Reassemble the control head.
 Remove bottom cover. Attention to the additional screws on the bottom cover.
 For 800 Mhz RX, feed a new antenna cable thru the optional antenna jack on the back on the main body of the radio.
 Locate antenna connector CN59 and attach the antenna cable.
 Reassemble the radio.
 Reset Microprocessor. [ Push and hold the { FUNC } key and turn the radio ON.
 

If you take off the removable front panel and remove the two Phillips screws holding the front panel together, you will find two jumper wires (one red, the other blue).
Cut both jumpers and reset (funct + power).

Remember to write down all your memories. You will find that the radio will receive on 108.00 to 142.990 AM on the vhf side and 850.000 to 909.9875 on the uhf side. To activate the (EXTRA OPTIONS), just press the VHF and also the UHF BAND buttons twice. With each press, you will activate either the normal or the EXPANDED band capabilities of the radio. It's nice when a Ham creates a rig to do things for other Hams. Look Ma, no special wiring or soldering to do. just cut some jumpers and away you go.

ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.