HMC985A

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Attenuators are commonly used in a variety of systems and devices. The HMC985A is a high power Variable or Fixed Attenuator made from Ferrite technology, that has been designed to fit within stringent space and power constraints. It is an attractive choice in today\'s market due to its wide frequency range, high power capability, and low cost.

The HMC985A is composed of a set of internal attenuator modules, with each module occupying a single package configuration of two or four poles in a 7”. The modules are housed in a cast aluminum casing with anti-corrosive coating and the internal structure is designed for optimum heat sinking. This attenuator provides a wide frequency range of 25MHz to 10GHz, which makes it suitable for many applications in a wide range of fields, including telecommunications, industrial, aerospace, and medical. The attenuation range is from 0.05dB to 20dB, with a power handling of 200W.

The HMC985A consists of a single 8-pole slide switch assembly that allows the user to adjust the attenuation level. The adjustment is made by sliding the switch assembly, thereby controlling the amount of attenuating power from the input source. This is accomplished by using an internal circuit with four series and four parallel resistors.

The operation of the attenuator is based upon several principles. First, the series resistors reduce overall voltage amplitude by dissipating some of the power in the form of heat. The second principle is that parallel resistors reduce the current levels to match the voltage values. This is important in reducing the power level of the input signal, as parallel resistors will effectively mirror the desired signal voltage levels. Finally, the selection of the series/parallel resistors is vital to make sure that the power reduction is properly accomplished without introducing unwanted harmonic distortion or signal attenuation levels.

The HMC985A is an ideal choice for applications requiring high power, wide frequency range, and efficient power reduction. With its low cost, compact size, and reliable performance, it is capable of providing reliable performance to a wide variety of applications. In addition, it is designed to meet the stringent safety standards required in today’s market. With the protection of the anti-corrosive casing, it is suitable for any environment and can handle the extreme temperatures and humidity found in some applications.

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