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High Frequency Roll Off in AM Mode

Dan Trainor
Dan Trainor Member ✭✭✭
in SmartSDR for Mac

I have an issue with my Flex 6600 TX on AM Mode.  When I run TX BW of 50-5000  or 50-6000 Hz the RF energy always rolls off significanly at about 4000 (and above) despite forcing an EQ curve that purposely boosts the highs in the range of 4000-6000 hz.  I have experimented with both the internal TX EQ and also my outboard EQ. Using the EQ to boost highs dramatically, yet energy above 4000 always falls off precipitously.  I also tested this on SSB and actually same behavior (not that I would run that wide on SSB). Has anyone experienced the same ???   SSDR Firmware version 3.8.21 and latest SmartSDR for Mac client, 2.9.70  Thank You in Advance, Dan de WA1QZX

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