locked Re: FST4 modes with TS-890S - slow RF envelope rise problem #txaudio


Hello Peter,

I'm using a Class E amplifier and am having similar issues to you. I've not investigated deeply so far and have no problems with WSPR but on FST4 modes the power supply often momentarily trips at the beginning of a sequence. When seen on an analyser the carrier rise from the FT-817 driver rig seems to be stepped in level which perhaps upsets the TC4427 FET driver chip. 

73 Chris G4SDG    

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