Abstract:
An RF directional coupler circuit assembly for matching high frequency cable TV apparatus includes a cover body, and a printed circuit board. The cover body includes a space. The space includes a bottom surface. An RF directional coupler circuit is arranged on the printed circuit board. A 0.01 mm˜2 mm gap is formed between the RF directional coupler circuit and the bottom surface when the printed circuit board is deposited in the space. The distance between the printed circuit board and the cover body is shorten because of the gap, so that the reflections of the high frequency signals and the signal fading are decreasing to achieve matching high frequency impedance characteristics.
Abstract:
A cable television device with high frequency impedance matching includes a housing and a removable collar. The removable collar is disposed on a signal inputting port or a signal outputting port of the housing and a cable wire is connected to the signal inputting port or a signal outputting port. When a high frequency is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire to reduce the reflected amount of the transmitting signal and the attenuation of the transmitting high frequency signal.
Abstract:
An expandable Ethernet power supply device includes a network line, a power sourcing equipment (PSE), a DC power inputting terminal and a power outputting terminal. A PoE outputting port is inserted into network equipment. An Ethernet connector is connected to a network data source. A DC power is inputted to the DC power inputting terminal and managed by the PSE, and then providing demanded working voltage of the network equipment and transmitting network data. The power outputting terminal is provided for connecting to the DC power inputting terminal of another Ethernet power supply device and demanded working voltage of more network equipment.
Abstract:
A radio tuning device through a cable includes an emitter and receivers. The emitter can be embedded in a wall and includes first tuning units. Each receiver is an advanced TV tuner to replace an original TV tuner; as a digital broadcast TV received by an original TV set through the TV tuner, an analog or digital TV from cables, and even an interactive digital TV are received through cables or wirelessly. Each receiver further contains a second tuning unit which can be combined with various computer interfaces or displayer interfaces, e.g. USB, PCMCIA, DVI, VGA or HDMI. The first and second tuning units are applied to a digital or analog interface, and are very highly compatible. Accordingly, the cable TV can be watched by wireless transmission without cabling in a room, which is pretty, saves time and labor work and allows cable channels to be watched on the computers.