C2073AT

Series:	*
Part Status:	Obsolete

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Introduction

Baluns are devices used to electronically do what are traditionally done by mechanical connections. As the acronym "Balun" implies, they are bridges designed to create an impedance or voltage match between two completely different circuits. C2073AT baluns are specially designed to match specifically 72 Ω coaxial cables to 50 Ω 1/4 inch or 3/8 inch type transmission lines.

Application Field

C2073AT is commonly used to match the 50 ohm RF systems common in most microphones. It is primarily employed to provide ideal mechanical and electrical interface matching between the different types of RF input such as a base station antenna and a transmitter port (TXP), a receiver port (RXP), or a duplexer port. In addition, the balun also often provides signal strength detection, signal conversion, and frequency conversion, simplifying the need for additional circuitry to accomplish the same tasks. By providing a physical connection that meets the requirements of both systems, it minimizes the risk of electrical interference due to differences in impedance between the two networks. In addition to this, it can also provide impedance matching between transformers, amplifiers, etc. and other high frequency terminations.

Working Principle

The balun works by shifting the potentials of two different signals at each end of the balun by the same amount. To accomplish this, the balun is designed to create a very tightly coupled coupling between two lines which then modifies the impedance of the lines. In a C2073AT, the 75 ohm line serves as the main input to the balun. The output from the balun is a matched 50 ohm line. As the signal passes through the balun, the internal impedance is shifted from 75 ohms to 50 ohms, resulting in a much improved signal transfer through the line. The main benefit of the balun is that the 50 ohm output line provides a consistent, predictable output impedance, eliminating the need for expensive additional components to calibrate the impedance. This allows the user to send a signal through the balun without worrying about the impedance issue, and the end result is much improved bandwidth, signal-to-noise ratio, and accuracy.

Conclusion

In conclusion, the C2073AT balun is an excellent device for matching 72 Ω coaxial cables to 50 Ω transmission lines. It can be used to provide a consistent impedance between different networks, and its tight coupling eliminates the need for expensive additional components. In addition, its signal-to-noise ratio, bandwidth, and accuracy are improved thanks to the balun\'s ability to shift the output impedance from 75 ohms to 50 ohms.

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