YES, IT CAN BE DONE !
Well, the difference between TH F6 and TH F7 is one diode. If you want to transform your TH F6 into TH F7 or your TH F6 into TH F7, then you may fallow these steps:
TH F6 and TH F7 is, actually, the same transceiver. Well, there is a difference: one diode.
This modification will reset your radio and therefore clear all pre-programmed memories, etc. Please write safely police, aviation and cordless phone frequencies saved in your memory;-)
First open your radio as described in the “MARS/CAP” modification page.
After that, locate those three diodes and one resistor located close to the “Power” button.
I will call these diodes D1, D2 and D3, starting from “Power” button, followed by the “R” (zero ohm) resistor.
Warning: these are NOT notations from Kenwood schematics.
On the original Kenwood TH F6 A you will find D1,D2,D3 and R all mounted. To convert your USA F6 model into F7 European model, you must remove the D3 (the one close to the resistor) diode.
After modification you will get European ARS on 2m band, no TX on 216Mhz band and all European options (Repeater options, bands, etc.).
On the original Kenwood TH F7 E you will find only D1, D2 and R fitted in. To convert your F7 European model into USA F6 model, you must fit in one diode in the “D3” position.
After modification you will get TX on 144-148Mhz, TX on 216Mhz, USA ARS on 2m and so on.
Warning: transmitting on the 216Mhz band may be illegal in your country. Also your antenna is only dual band, so think twice before pressing that PTT button ;-)
All “MARS/CAP” modifications are still available for you’re your new F6/F7 transceiver ;-)
Here I will publish a few D1 D2 D3 R configurations I have found...To be continued...