Store › Forums › QRP Transceivers › MTR3b (and 5b) – how does the battery voltage alarm work? › Reply To: MTR3b (and 5b) – how does the battery voltage alarm work?
The letter “L” will be displayed on the LED readout when the voltage drops below the set point. The factory setting is 5.5 volts. This is the absolute minimum the MTR3 will functionoperate at.
73 for now,