There are several different mods to extend the transmit and receive of this radio; the one you use will depend on the region your radio is designed for.
TX Modification
All region TX mods require you to remove the bottom cover and remove diodes D312 and D310. After modification, TX range is:
137.000 - 174.000 Mhz
400.000 - 470.000 Mhz
RX Modification
For the Americas version of the radio, no mods are necessary for complete RX coverage.
European radios require removal of D316 and then the key sequence; Asian radios only require the key sequence. The key sequence is as follows:
1. Turn off the radio
2. Left AF VR set to 9:00 o’clock, and Left SQL VR set to counter clockwise.
3. Right AF VR set to 9:00 o’clock, and Right SQL VR set to 12:00 o’clock
4. Turn on the radio by pushing “POWER” key, during touch “HOME”
After the RX expansion is performed, frequency range is:
118.000 – 136.995MHz (AM)
137.000 – 174.000MHz (FM)
375.000 – 550.000MHz (FM)
Here are the pictures of the modification locations:
Bottom cover removed
Diode locations
TX Modification
All region TX mods require you to remove the bottom cover and remove diodes D312 and D310. After modification, TX range is:
137.000 - 174.000 Mhz
400.000 - 470.000 Mhz
RX Modification
For the Americas version of the radio, no mods are necessary for complete RX coverage.
European radios require removal of D316 and then the key sequence; Asian radios only require the key sequence. The key sequence is as follows:
1. Turn off the radio
2. Left AF VR set to 9:00 o’clock, and Left SQL VR set to counter clockwise.
3. Right AF VR set to 9:00 o’clock, and Right SQL VR set to 12:00 o’clock
4. Turn on the radio by pushing “POWER” key, during touch “HOME”
After the RX expansion is performed, frequency range is:
118.000 – 136.995MHz (AM)
137.000 – 174.000MHz (FM)
375.000 – 550.000MHz (FM)
Here are the pictures of the modification locations:
Bottom cover removed
Diode locations