The spherical dipole antennas operate on battery power so no metal wires or conductors will interfere with the repeatability and accuracy of the USDS. One or two 6 VDC NiMH battery boards maybe be installed and are designed to install inside the spherical dipole antennas and operate in parallel to provide the power needed for the internal electronics. When two battery boards are installed, they provide double the current capacity for longer operating times. Each battery board supplies in excess of 1000 mAh for extra long operating time during real-world testing applications.

(click on image for larger picture) Each Battery Board uses five AAA NiMH cells to supply 6VDC. The PSDS and USDS use two Battery Boards connected in parallel for extra long operating time during real-world testing applications. Both Battery Boards are charged at the same time using a commercial wall-mount power supply for easy battery recharging.

Each battery board is fully rechargeable while installed inside the spherical dipole, or externally from the sphere, using a standard wall-plug power supply. These battery boards use AAA Ni-MH batteries which are easily removed and replaced with new AAA batteries and can be easily recharged externally from the sphere with standard AAA Ni-MH battery cell charger. A push button switch on the spherical dipole allows the batteries in the spherical dipole to be turned on/off, allowing the useful battery life to be extended. When the power is switched 'on', a green LED on the sphere white ring is illuminated. A Low-Voltage detection circuit resides on each Battery Board which activates a relay to disable output battery power and enable a red LED to indicate a Low Voltage state. A battery isolation jumper is included on each battery board to prevent battery cell depletion from leakage over long storage periods.