Abstract: A vehicular radio communications system establishes a bi-directional digital radio communications link between a local wireless communication device inside a moving vehicle and a sequence of radio transceivers in a wireless network. The local device operates in a plurality of different device frequency bands and the external transceivers operate in a plurality of different network frequency bands. Some or all of the device frequency bands are the same as some or all of the network frequency bands. The system comprises a set of one or more external radio antennas operating in an external downlink and an external uplink using a network frequency band and a set of one or more local radio antennas operating in a local downlink and a local uplink using a local frequency band different from the network band.

Abstract: A vehicular radio communications system establishes a bi-directional digital radio communications link between a local wireless communication device inside a moving vehicle and a sequence of radio transceivers in a wireless network. The local device operates in a plurality of different device frequency bands and the external transceivers operate in a plurality of different network frequency bands. Some or all of the device frequency bands are the same as some or all of the network frequency bands. The system comprises a set of one or more external radio antennas operating in an external downlink and an external uplink using a network frequency band and a set of one or more local radio antennas operating in a local downlink and a local uplink using a local frequency band different from the network band.

Abstract: An air intake apparatus for supplying air to an internal combustion engine, comprises a unitary hollow enclosure, a motor vehicle battery, an air filter and an air compressor which when activated compresses air supplied to the engine. The enclosure houses the battery, air filter and compressor. An engine air supply path through the enclosure passes from an air inlet to the enclosure to an air outlet from the enclosure via the air filter. The enclosure inlet and enclosure outlet define respectively an upstream end of the air supply path and a downstream end of the air supply path. The apparatus includes an automatic air bypass within the enclosure that directs air in the air supply path to the air compressor when this is activated, and which allows air to in the air supply path to bypass the air compressor when this is not activated.

Abstract: An air intake apparatus for supplying air to an internal combustion engine (1), comprises a unitary hollow enclosure (50), housing a motor vehicle battery (16), an air filter (9) and an air compressor (10) which when activated compresses air supplied to the engine (1). An engine air supply path through the enclosure (50) passes from an air inlet (52) to the enclosure to an air outlet (54) from the enclosure via the air filter (9). The apparatus includes an automatic air bypass (13, 74, 84) within the enclosure (50) that directs air in the air supply path to the air compressor (10) when this is activated, and which allows air to in the air supply path to bypass the air compressor (10) when this is not activated.