There was a download of IMP Calc 2.21.173 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the program is ATDI Limited. The program belongs to Office Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
IMP Calc is a stand-alone Windows utility that simplifies the whole task of calculating, viewing and evaluating intermodulation products.
In any location where several transmitters and receivers are operated, signals will interact by what is referred to as the heterodyne effect; interaction (or 'intermodulation') products are produced on all sum/difference and product combination frequencies of every signal present.
You may want to check out more software, such as Thermo-Calc, SysInfoTools Open Office Calc File Repair or QC-CALC SPC, which might be related to IMP Calc.
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