Hi All I just did my first FMT using a Flex 6300 and using the FMT software that comes with WSPR. Measuring W6OQI on 20M an hour apart, I measured about 1/2 a Hertz difference of 0.518Hz. My deltas are: W6OQI on 20M = 0.19Hz K5CM on 40M = 0.17Hz W8RKO on 40M = 0.79Hz K5CM on 80M = 0.07Hz W8RKO on 80M = 0.14Hz I was pretty pleased how well this turned out considering it was my remote base with a Flex 6300 and I only used the software that was already installed. Mike va3mw