A method of powering a radio that is mounted on a tower of a cellular base station, or other location remote from an associated baseband unit, the method comprising: outputting a direct current ("DC") power signal from a power supply and supplying the DC power signal that is output from the power supply to the radio over a power cable; and adjusting a voltage level of the DC power signal that is output from the power supply so that the DC power signal at a radio end of the power cable that is remote from the power supply has a substantially constant voltage notwithstanding variation in a current level of the DC power signal that is output from the power supply, wherein the power supply comprises a programmable power supply, the method further comprising receiving inputted information at the power supply from which the voltage level of the DC power signal that is output from the power supply is determined that will provide the DC power signal at the radio end of the power cable that has the substantially constant voltage, wherein the substantially constant voltage of the DC power signal at the radio end of the power cable exceeds a nominal power signal voltage of the radio and which is less than a maximum power signal voltage of the radio, characterized in that the information input to the power supply comprises information from which a resistance of the power cable is determined, and the method further comprising measuring the current level of the DC power signal that is output from the power supply, wherein the voltage level of the DC power signal that is output by the power supply is automatically adjusted in response to changes in the measured current level of the DC power signal that is output from the power supply to provide the DC power signal at the radio end of the power cable that has the substantially constant voltage. outputting a direct current ("DC") power signal from a power supply and supplying the DC power signal that is output from the power supply to the radio over a power cable; and adjusting a voltage level of the DC power signal that is output from the power supply so that the DC power signal at a radio end of the power cable that is remote from the power supply has a substantially constant voltage notwithstanding variation in a current level of the DC power signal that is output from the power supply, wherein the power supply comprises a programmable power supply, the method further comprising receiving inputted information at the power supply from which the voltage level of the DC power signal that is output from the power supply is determined that will provide the DC power signal at the radio end of the power cable that has the substantially constant voltage, wherein the substantially constant voltage of the DC power signal at the radio end of the power cable exceeds a nominal power signal voltage of the radio and which is less than a maximum power signal voltage of the radio, characterized in that the information input to the power supply comprises information from which a resistance of the power cable is determined, and the method further comprising measuring the current level of the DC power signal that is output from the power supply, wherein the voltage level of the DC power signal that is output by the power supply is automatically adjusted in response to changes in the measured current level of the DC power signal that is output from the power supply to provide the DC power signal at the radio end of the power cable that has the substantially constant voltage.