I have a Flex 6500, which I am very happy with, but from the beginning I have had a tuner issue at about 3.6 Mhz. The autotuner will simply not tune between about 3.575 and 3.625. The measured SWR is about 3.14. I sent it back to Flex more than a year ago for checking and they didn't find any issues. Steve tells me that it should tune anything under an SWR of 10, and it appears to do so everywhere else, including 160 M for which I do not even have an antenna. I am using an 80 meter dipole resonant at about 3.8 Mhz with a 40 meter dipole fed from the same point drooping about 5 feet below it, with a balun. It tunes fine everywhere on 40 and everywhere else but around 3.6 on 80. Changing the coax length doe not seem to affect this. Any one else had a similar issue? Any ideas?