This Double Cavity FM Filter 300W N-out from Delta Meccanica is suitable for transmitters up to 300 Watt to suppress intermodulation products when multiple FM transmitters are used in the same location or in close proximity to each other. New frequencies are formed (intermodulation products) that are present on the different frequencies (e.g. 100 MHz and 106 MHz forms a signal on .94 MHz and 112 MHz).
This signal must be strongly suppressed. This is achieved by placing a cavity filter after the output of each transmitter or output stage. If the frequencies of the FM transmitters are close together, a triple cavity filter should be chosen (guideline: minimum distance 1.2 MHz). The cavity filter has to be calculated on the power of the transmitter or the power amplifier.
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