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Anyone having trouble transmitting SSB on 17 meters?

I have a Flex 6400 V 3.3.33.10471. Today I tried transmitting USB on 18.166 MHz and got the "interlock is preventing transmission" pop-up message. On a whim, I added a second receiver, changed its mode to CW, and was able to make a mixed-mode contact with W4WKU operating POTA in KY.
I did a factory reset and tried it before re-importing and got the same message. I normally have my TX Filter set to 200 - 2900. I tried cutting it way back to 2500 at the high end, but still have the issue. If I tune down to 165.100, I am able to transmit again.
If others are seeing this, then it is likely a small bug in the US Turf file. Otherwise, I suspect my SD card. I think that Dave, W4WKU was using his Flex 6400 on V 2.8.1 without issue. Dave, if you read this could you confirm which radio you were running today?
Nevermind... I was too close to the band edge.
Answers
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Hi Len... LOL... as I was reading your first paragraph, my first thought was '...too close to the band edge.' And was all ready to launch into the discussion of having to check your TX bandwidth settings :-)
Saw the message at the end :-) Glad you found it.
BTW, for others -- another 'hint' (courtesy of the Flex Software Engineers) is that the TUNE and MOX buttons will grey/gray out when you will transmit outside the band limits.
NOW.. just to bug MIke, etc. I wonder when us CAD hams will get the updated TURF file for 60m???? :-)
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