Radio telephone suitable for portable and vehicle-mounted use

DETAILED DESCRIPTION An object of the present invention is, therefore, to provide a radio telephone suitable for both portable and vehicle-mounted use.
Another object of the present invention is to provide a radio telephone capable of saving power in portable use while improving the receiver performance in vehicle-mounted use.
Yet another object of the present invention is to provide a radio telephone having an improved IM characteristic and reception sensitivity in its vehicle-mounted use.
A further object of the present invention is to provide a radio telephone consuming less power in its portable use.
According to the present invention, there is provided a portable radio telephone comprising, a receiver section which includes at least an RF amplifier and a first frequency mixer.
The telephone also comprises a battery which supplies a first voltage to the receiver section when the telephone is in portable use.
When the telephone is mounted on a vehicle, a vehicle battery applies a second voltage which is higher than the first voltage, to the RF amplifier and to the frequency mixer.
By this higher voltage supply, the intermodulation characteristic and reception sensitivity of the receiver section can be improved in the vehicle-mounted use.
On the other hand, battery saving can be achieved by the lower voltage supply in the portable use.