Pure speculation, but I think the IAS could be the issue. I'm pretty sure there is a way to get this as one of the readouts on your vario (upper or lower number). At least it is on the new color screens coming as an option with refurbed LX7007 units like one I just purchased. You may be able to just buy a new screen, which might seem like overkill, but I do prefer the stepper motor and color indicators an improvement on the old LCD variety readouts, especially having a needle moving instead of LCD indicators coming on and off.

2C

On Monday, April 22, 2013 7:49:16 PM UTC-4, 2NO wrote:
I use a switch on my flap handle, so the unit is in climb mode when the flap is in position 5 or higher.



I checked the p-tot using a simple blow test but nothing more sophisticated.



Alas I cannot find a way to view the IAS on the LX. An option I guess it to turn on the LX's IAS (logging) sentence and compare it to observations.



Another problem I'm having with the LX that could possibly be related is that when on the ground, the LX always thinks it's in flight, which makes it impossible to change certain settings or to transfer a flight log. That would happen, I think, if it is getting an indicated airspeed.