Alinco DR-620T (DR 620 T DR620T) transceiver: MARS Modification

1. Open the cover of the main unit and locate the CPU just behind the left side corner.
   
   
2. Locate a jumper wire marked JP3 on the circuit board near the CPU.
   
   
   
   
3. Cut the jumper wire, remove it and reassemble the radio.
   
   
4. Reset CPU by holding in the F key while powering the radio on.

After the mod, RX frequency expands to:
MAIN: 76-108MHz (WFM), 108-136 MHz (AM/FM), 136-174 MHz (AM/FM), 400-480 MHz (FM), 800-1000 MHz (FM), 335-400 MHz (FM)
SUB: 136-174 MHz (FM), 400-480 MHz (FM), 335-400 MHz (FM)

(T version is opened for RX already as default with 800 MHz cell frequencies blocked)

The TX frequencies should now be 140-150 MHz / 415-455 MHz MAIN BAND ONLY

The radio MAY actually TX over a wider range, but Alinco states that you risk damaging the unit.

NOTE: There is no cross-band repeat function in this unit; Alinco suggests that those requiring this function purchase the DR605.