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Are coax couplers directional?
Coax directional couplers can be used for sample power from a line without altering the characteristics of the line. Power measurements are achieved by inserting a directional couple and using simple, low level detectors or field strength meters and power measuring equipment.
What is RF coupler used for?
RF & Microwave couplers are passive devices that are used to sample high frequency signals. It takes one signal as the input and provides two outputs – One being the regular output and the other being the coupled output.
When do you need a directional coupler for cable TV?
Engineering a Cable TV Distribution system for a hotel, apartment or town is far more complex then this simple scenario, but it should give you a basic understanding of Directional Couplers. For residential applications Directional Couplers are most often used in a loop through distribution system.
How are direction couplers different from signal splitters?
Unlike splitters which divide signals evenly to all ports, direction couplers allow a signal to be removed from the main line without lowering the signal level of the main line as much as a signal splitter. The signal level measured at the tap port (s) is “X” dB less than the signal level measured at the input.
Which is a feature of a directional coupler?
Directional couplers are extremely useful passive RF components capable of extracting a small portion of the energy from the main transmission path, and redirecting it to one, or more, coupled ports. As isolation from the coupled ports to the main transmission path is desirable, directional couplers typically have high isolation among the ports.
How are CATV taps and directional couplers tested?
Every CATV or MATV distribution system contains splitters, taps, directional couplers and other passive components. These components may develop excessive signal attenuation and losses, or poor isolation between inputs and outputs. These components can be tested using a RF signal source, termination resistors, and the Frequency Selective Voltmeter.