Thanks for the replies everyone.

I’m trying to understand what WSJT-X is assuming about Flex 6xxx radios that 
results in the odd behavior I described.  WHY I want to operate split is 
irrelevant to the question but just for information, I am trying to experiment 
with different ways of using WSJT-X, mostly just to understand it.  I’ve read 
the documentation through and this aspect is not well covered.  My experience 
is use cases often follow (the suggestion regarding JA operation on 160 is 
potentially a good example).  Another is it appears to BE doing something that 
doesn’t make sense and it may be helpful to report a bug but, again, that’s 
irrelevant to my post.. All I’d like to know is if anybody actually KNOWS what 
WSJT-X does or is trying to do in split mode when set to a Flex 6xxx radio.  

> On Oct 27, 2018, at 9:01 AM, Bill Somerville <g4...@classdesign.com> wrote:
> 
> On 27/10/2018 12:40, Jay Hainline wrote:
>> Bill, Mike and others,
>> 
>>  
>> 
>> You do realize that JA on 160 meters is restricted to using FT8 at 1908 khz? 
>> Practice has been for JA to call for DX at their allocation and listen for 
>> NA stations transmitting at 1840. Widening the bandwidth window is not very 
>> eloquent. Surely using a split VFO option with 2 slices would be more 
>> feasible. My 2 cents…
>> 
>>  
>> 
>> 73 Jay KA9CFD
>> 
>> 
> Hi Jay,
> 
> I see no mention of top band in the OP, although there may be issues using 
> traditional split operating to work stations in a separate sub-band I don't 
> think that is related to the OP's query. Currently the use of SPLIT mode on a 
> rig by WSJT-X is incompatible with working stations on a separate sub-band as 
> SPLIT is used for a different purpose i.e. to extend Tx coverage up to the 
> bandwidth of the receiver and to ensure cleaner Tx signals free of unwanted 
> audio harmonics.
> 
> 73
> Bill
> G4WJS.
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