I live about 1.5 miles from a 50KW AM broadcast station (770 khz). With my Flex 5000 I was able to enjoy image free operation (even on 160 m) by using an external filter connected to the looping in / out. Since upgrading to the 6500, I’m amazed that the filter is no longer required – NOT EVEN ONE TRACE OF ANY AM BCB DEGRADATION.
Last night I switched to 160m and was alarmed to see dozens of strong images scattered across the 160 m band. Switching in that optional filter immediately removed them, but the question was “why are they back”? I discovered that the preamp was now set to +10db (another bug)?. Changing back to my default “0FF” setting returned the 6500 back to normal operation.Can the Flex guys explain what happened? Does the preamp remove some sort of band pass filtering? Not necessarily a problem, but I was not able to find any mention of this preamp related degradation in the owner’s manual.