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How do “combination” antennas, such as Comant’s GPS/VHF ComDat® antennas, work without a minimum required separation ?

April 26, 2017ANTENNAS comant GPS minimum Separation VHF

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How do “combination” antennas, such as Comant’s GPS/VHF ComDat® antennas, work without a minimum required separation ?

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All GPS/VHF ComDat® antennas utilize a built-in notch filter that removes VHF harmonics that are coincident with the GPS frequency. These 12th and 13th harmonics are “notched” with an 80dB isolation filter.