1. If the Alex checkbox is unchecked in the H/W Select menu tab two things will happen: RX-1 will no longer be connected to the ANT port so nothing will be received and the 200D will no longer produce RF output through the PA. Instead of bypassing the Alex HPF it appears that unchecking the box completely disconnects the Orion from the PA board.

2. If the Alex checkbox is left checked, which is the default setting, and the HPF/LPF menu form is set to bypass the HPF on TX and the band-by-band bypasses are also checked, as seen in the screenshot below, Thetis will throw a Fatal Error the next time it is started.


Just passing this along as an observation I discovered while attempting to run my 200D without Alex enabled as PS behaves a little better for me that way due to slightly less internal crosstalk. I do not know if other 200D users will see the same behavior or if it affects other models as well.
73,
Rob W1AEX