Speed Spikes AS2012

I'vee been seeing periodic airspeed spikes when flying AS2012 and PDMG NGX. I've made the mods to the FSX.CFG file as suggested, but am not using FSUIPC smoothing of the winds. Mostly the spikes are a couple of knots, but can be more (and trigger a momentary overspeed at cruise).

I recorded flight data with FSRecorder and then converted to text to examine the raw data. What I saw was a spike in airspeed once every second (wtih 1/32th second sampling). The spike died away within the next one or two samples. Has anyone else seen this behavior?

I'm hoping not to have to use FSUIPC to smooth the winds, since Active Sky shouldn't need this.

Bill Rowe