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Intermodulation Interference Intermodulation Testing

by:Mayer     2020-08-14
What is Intermodulation Interference? There are three main categories of Intermodulation Interference. They made receiver, transmitter to produce, and 'other' Intermodulation interference radiation. Transmitter Intermodulation interference is produced by one or more transmitters impressing in the final output stage to non-linear scheme is the result of another transmitter signal, usually through an antenna connector. Intermodulation of the frequency of re-radiation from the transmitter antenna. Receiver Intermodulation interference produced by two or more transmitters results mixed signal RF amplifier or mixer stage, a non-linear operating range of the receiver. Intermodulation interference radiation in other transmitter signals mixing other non-linear junctions result. These units are usually a metal, such as the rusty bolts on a tower, dissimilar metal junctions, metal or other non-linear junction area. Intermodulation products can also be caused by the linearity of the transmission system, such as antennas, transmission lines, or connectors. What is a transmitter harmonic interference? Transmitter harmonic disturbance caused by non-linear characteristics of the transmitter. Harmonics are always multiples of fundamental frequency and non-linear design of the final stage of the transmitter output. If the harmonic signal falls to a nearby receiver and the signal level is sufficient passband amplitude, the receiver can degrade performance. What is a false transmitter output interference? Transmitter spurious output interference may be attributed to many different factors transmitter. False frequency generation may be due to the non-linear characteristics of the transmitter or possibly the physical arrangement of components and unwanted coupling. If the spurious signal falls to a nearby receiver and the signal level is sufficient amplitude passband, which can degrade receiver performance. What is the receiver sensitivity to interference? Receiver sensitivity of interference occurs when unwanted signals from nearby, the off-frequency transmitter is close enough to the receiver operating frequency. The signal can get through the selectivity of the RF receiver. If the unwanted signal amplitude is sufficient, the receiver critical voltage and current levels by the receiver and its operation is degraded operating frequency. The receiver gain is reduced, thereby reducing the functioning of the receiver. High-power transmitter can operate from a few megahertz frequency receiver and / or the antenna may be located several thousand feet from the receiver antenna, and even lead to 'desense' interference. What is transmitter noise interference? Transmitter noise interference occurs because the energy emitted by the transmitter, the operating frequency as well as frequencies above and below the assigned frequency. Energy that is emitted above and below the assigned frequency band is known as noise power and lasts a few megahertz operating frequency by both side. This unwanted noise energy can get to a nearby receiver, even if the recipient is the operating frequency of several megahertz away passband. Transmitter noise appears as a channel noise and interference can be filtered by the receiver. It is on the receiver operating frequency and compete with the desired signal, which in effect, degrades the performance.
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