What is variable attenuator?
What is variable attenuator?
A variable attenuator is a circuit that decreases the strength of the input signal either continuously or step by step without appreciable signal distortion while substantially maintaining constant impedance match. Mechanically variable attenuators are usually adjusted with a tuning screw or control knob.
Where is variable attenuator used?
Variable RF attenuators: Variable RF attenuators are normally used in applications where it is necessary to continuously vary the level of a signal. Typically variable attenuators provide a continuous level change by varying an analogue voltage on the input control line.
What is the importance of variable attenuator?
An attenuator for reducing the strength of an alternating-current signal either continuously or in steps, without causing appreciable signal distortion, by maintaining a substantially constant impedance match.
What causes the attenuation in the type of variable attenuator?
As with other waveguide components, the size of the waveguide in a variable attenuator will determine the usable frequency range. Often, some form of movable structural element within the waveguide, such as a rotary vane or moving resistive card will cause the attenuation variation.
What is attenuators in microwave?
The attenuators are basically passive devices which control power levels in microwave system by absorpsion of the signal. Here resistive film is fixed at the centre conductor which absorb the power and as a result of power loss and hence microwave signal gets attenuated. This is referred as coaxial line attenuator.
What are attenuators and equalizers?
As nouns the difference between attenuator and equalizer is that attenuator is (physics) any device that attenuates a signal, but especially an electronic device that reduces the amplitude of a signal while equalizer is one who makes equal; a balancer.
Why attenuators are used in microwave circuits?
Fixed attenuators in circuits are used to lower voltage, dissipate power, and to improve impedance matching. In measuring signals, attenuator pads or adapters are used to lower the amplitude of the signal a known amount to enable measurements, or to protect the measuring device from signal levels that might damage it.
How much does an attenuator weigh?
Most models weigh 2 or 3 ounces and have been qualified for all types of military applications. Since attenuation is achieved in a non-contacting manner, these units provide the most in wear-free performance and high reliability.
What is a mid-size coaxial attenuator?
ARRA’s mid-size coaxial attenuators represent the most complete line of mid-size continuously variable attenuators available today. Most attenuators have been qualified for all types of military applications. Since attenuation is achieved in a non-contacting manner, these units provide the utmost in wear-free performance and high reliability.
What is the diameter of a 4061 attenuator?
The standard attenuator packages, Forms 4061 and 6931, have non-translating 1/4″ diameter shafts with lock nut. They achieve full attenuation in less than 20 turns. To maintain versatility, this attenuator comes in 3 other packages.
How do I calibrate my T & D attenuator?
Both T & D options can be calibrated by utilizing a calibration chart. Order CT or CD option. The standard attenuator packages, Forms 2191 and 3651, have non-translating 1/4″ diameter shafts with lock nut. They achieve full attenuation in less than 20 turns.