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UHF Amplifier- problem with level intermodulation distortion

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Vigort

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UHF Amplifier

Hi!
Help to decide please following problem.
The preamplifier for DVB the transmitter on BLF2045 is developed.
Amplitude-frequency characteristic unevenness nearby 1 dB, VSWR 1,5).
Problem with level intermodulation distortion - 30 dB (a compression point - more 1 dB).
How it is possible to increase intermodulation distortion?
 

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