Commscope helps design, build and manage wired and wireless networks around the world. These imds occur mainly in devices such as amplifiers and mixers3,7 even if these imds are not exactly located at the signal frequency in spectrum, they are still able to interfere signal. Get access to commscope calculation, performance specification, configuration and. The programs installer file is commonly found as intermodulation analysis. The intermodulation products are sum and difference as well as other integer and non integer multiple of these frequencies.
Rf intermodulation calculator formula rf imd calculator equation. It can be installed on any pc using windows 2000 sp4 or higher, windows xp sp3 or higher, windows vista and windows 7. Radio mobile is propagation simulation software free to the amateurradio community. We will understand pim passive intermodulation one of the imd types and understand methods to minimize or mitigate pim. Up to transmit and receive frequencies can be entered with a frequency. The most prominent during a two tone test would be the intermodulation products at 2f1f2, 2f2f1 and third harmonics at 3f1 and 3f2. Fintermod download fintermod calculates rf and optical. Sifm is the sennheiser software for rapid calculation of intermodulationfree radio frequencies for wireless. Referring to figure 11, percentage intermodulation is calculated from a and b scaled on the cro display as. Intermodulation definition of intermodulation by merriam. It is a followup to their 1962 collaboration undercurrent.
With the ever growing amount of wireless gear used for live events, rf. Figure 10 test for audio intermodulation distortion using cro display. For example, you could hear strong interference at 14. Site designers, it provides system calculations for. Midians intermodcalculator predicts the possible occurrence of intermodulation products that may cause receiver interference at the radio repeater site.
Unlimited calculated intermodulation frequencies output with order of 2 and higher. Intermod includes tools to help the audio engineer drill down the massive amount of data, to a smaller set of most. These studies predict intermodulation interference and provide. This download is usable only by those customers who have purchased and registered their intermod calculators. Intermodulation 1966 intermodulation is a 1966 jazz album by pianist bill evans and jazz guitarist jim hall.
Rf calculator conversion from and to various rf units intermodulation calculate intermodulation for 2 and 3 frequencys up to the 9th order. This intermodulation calculator intermodulation study software is softwarebased. Click here for additional information and photos on the intermod calculator. When 2 or more antennas operating at different frequencies are installed on the same platform i. A simple resistive mixing network is used to prevent interaction between the audio generators. Intermodulation intermodulation products intermodulation software. Calculate intermodulation products from 2 and 3 frequencies. A must have for radio engineers and catv engineers.
A general algorithm to calculate third order intermodulation. Heikki mattila, marko leinonen term and year of completion. This terminology, though technically incorrect, is used to define the same products in broadband intermodulation analysis and will be clarified later. It includes features you wont find in any other product including those that cost many times more. As a leader in communications infrastructure, we have built a. Midian electronics intermod calculator software downloads. Intermodulation products result in interference, when two or more signals combine in a nonlinear device and produce an undesired signal on or near the tuned frequency of the victim receiver. The intermod product calculator programs that one finds today generally just do bruteforce number crunching. The report describes the results of an effort to develop hardware that can be used to reduce intermodulation product imp generation in vhf communication systems. Macros are also available to copy intermodulation frequencies for import into frequency coordination software. Intermodulation models this annex describes two intermodulation models. Fintermod calculates rf and optical intermodulation products.
Intermod is an application that uses visual basic with an msexcel frontend. An online application for calculating the intermodulation distortion products imd3 arising from third order nonlinearities thirdorder intercept point, ip3 in rf receivers under twotone input. Though this much is helpful, the technician gets little other assistance from the program. Intermodulation definition is the production in an electrical device of currents having frequencies equal to the sums and differences of frequencies supplied to the device or of their harmonics. Download intermodulation calculator best software for windows. The universal band and block pim calculator allows you to first select a regional tab and then select various combinations of transmit downlink frequency bandsblocks to determine whether there are any theoretical possibilities of 2nd, 3rd, 4th or 5th order passive intermodulation pim products or hits being produced in the companion. Midians intermod calculator predicts the possible occurrence of intermodulation products that may cause receiver interference.
Welcome to intermod assist intermodulation calculator and frequency coordination software. Precise analysis of the quality of mobile communication infrastructure is also possible. They generate huge imposing looking lists of possible intermod products for a technician to investigate. Interaction of intermodulation products between dut and. Intermodulation calculator intermodulation study software. Higher harmonics and intermodulation products are not labeled. Sifm is the sennheiser software for rapid calculation of intermodulationfree radio frequencies for wireless microphone systems. Intermod calculator intermodulation study software intermodulation calculator. Measuring intermodulation distortion products the level of intermodulation may be dependent on many variables such as. Section 1 outlines the general formula for calculating receiver intermodulation interference.
Methods to measure and communicate the extent of this. Passive intermodulation analyzers from rosenberger facilitate quick and accurate measurement of the intermodulation characteristics of passive components, such as connectors, cable assemblies, antennas and filters. The generation and mitigation of these intermodulation products are described in the following sections in more detail. Intermod study program c aksala electronics this is the list of frequencies for the study. The fcc mandates that antenna owners or licensees must ensure that the rf signal from their sites does not interfere with any existing signals from other carriers, public safety, etc.
Passive intermodulation in passive radio frequency filters supervisors. In this page we will cover intermodulation distortion imd basics, types and imd products. New progresses in ic technology extend the application of op amps where some years ago discrete circuits played the major role. These frequency sets can be used for the purpose of frequency coordination where the goal is to assign the most reliable channels to your wireless audio and video gear that is, to ensure reliable operation of the wireless devices by assigning. Intermodulation intermodulationimd distortion is the result of two signals interacting in a nonlinear device to produce additional unwanted signals. Intermodulation interference calculations in the landmobile.
Imd intermodulation distorion basics,types and products. If the input of a linear timeinvariant system is a signal of a single frequency, then the output is a signal of the same frequency. Intermod assist intermodulation calculator and frequency coordination software is a unique tool it will change the way you approach the problem of intermodulation interference and the challenges of frequency coordination and channel assignment. What is pim passive intermodulation distortion mitigation. Intermodulation calculator intermod study software. Buy midian electronics intermod intermodulation product. The combination process can occur in the final stage of a transmitter or in the rf of first mixer circuitry of a receiver. The intermodulation distortion imd performance of 1 wideband, dccoupled amplifiers is a relatively new area for integrated operational amplifier suppliers. Intermodulation calculator free download suggestions.
It can be a tremendous job to calculate the intermodulation products from several frequencies, below is a calculator that calculates the intermodulation product from two and three frequencies. For three signals, the worst intermodulation levels are typically when the phase of the signals are adjusted to give the largest amount of peak envelope power. The actual developer of the software is professional wireless systems. Intermodulation calculator for rf devices spreadsheet. The terminology, thirdorder intermodulation product is traditionally used to define the important intermodulation products in narrowband analysis. Professional wireless systems is a leader in the wireless audio industry. Radio mobile rf propagation simulation software online. Refer intermodulation distortion and imd products for more information. Online calculators this website offers a collection of online rf tools. Rf intermodulation freeware downloads shareware central. Interference and intermodulation studies are necessary to determine the potential of any new or modified signals interfering with existing signals, so owners can plan and. The most bothersome in a relative narrowband system would be the intermodulation products, as they often appear in band. This product can be used with a notebook pc to solve intermodulation interference problems at radio repeater sites, cellular sites, military installations, airport control towers, etc. This software is used to calculate interference from colocated transmitters that generate harmonics that may be in the same frequency as a receiver on.
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