RF white paper

There are several academic studies that confirm the 25dB reduction as distance doubles.

I believe they gave the figures for free space and stated that the 25dB figure was for the typical indoor environment. There were studies done at Ohio State which gave much the same averages.

I doubt that Echel>The 25dB attenuation value may be true for certain types of walls or

Sure, there are any number of coatings or additives in the glass that would end up blocking RF signals. I've got a sunroom that's practically a faraday cage due to the windows. Open the door or a window and WiFi and cell services greatly improve.

It's interesting to see echelon making noises again. The fear of zigbee must be pretty strong. Is anyone making residential devices using echelon stuff?

I think they've concentrated on Europe and industrial markets. An Italian electrical utility uses their technology for meter reading. One of Echelon's press releases says, "Italy is one of the largest markets for LonWorks based devices and automation networks in the world. Enel S.p.A., the Italian utility, has installed over 10 million LonWorks based electricity meters in Italian homes. Merloni S.p.A., Europe's third largest appliance manufacturer, markets the Ariston Digital line of LonWorks enabled appliances in Italy."

Unless things have changed recently I think their technology is too costly to have much residential market penetration in the US.