Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

There is provided a microphone device for transmitting a collected audio signal to a receiving device wirelessly. The microphone device includes a battery, a current suppresser that is connected in series with the battery and suppresses a current from the battery and a plurality of transformers each of which is connected in series between the current suppresser and each of a plurality of loads and outputs a voltage in response to a corresponding load of the plurality of loads connected thereto based on an output of the current suppresser.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

There is provided a microphone device for transmitting a collected audio signal to a receiving device wirelessly. The microphone device includes a battery, a current suppresser that is connected in series with the battery and suppresses a current from the battery and a plurality of transformers each of which is connected in series between the current suppresser and each of a plurality of loads and outputs a voltage in response to a corresponding load of the plurality of loads connected thereto based on an output of the current suppresser.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (V.sub.RRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (V.sub.IN) from a DC power supply and generates an output voltage (V.sub.OUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the V.sub.RRH measurement and then adds different voltage steps to V.sub.IN so V.sub.OUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.