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instead of batteries
of the 2 batteries needed in :
R-105D to R-109 D
R-105 M to R-109 M
you can use the circuit above. (Thanks to DJ8CY). Values:
2 resistors, 1 Ohm, 3 W each; 6 diodes, e.g. 1N540.
Enough power is provided to even run the transceiver R-104. The 5 V come -in my case- from a cheap computer switching power supply. Please make sure that the power supply may be used without a load; some cannot stand this.
R-107 T digi can be used directly on 5 V without the circuit above.