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Power Supply 

instead of batteries

Instead of the 2 batteries needed in :

R-105D to R-109 D

R-105 M to R-109 M


R-104 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.