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Three v p e of IFM system in this paper are presented. Classical IFM consisting of direction couplers and power dividers has been modrfied by applying phase shifters. Two other IFMs are also described. The diode ring was used in one IFM and only power dividers in another one. Conversion technique of output signals is written down. These IFMs can reach,fiequency resolution better than I MHz. They were examinedpractically.

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