<html><body><div style="font-family: Arial; font-size: 12pt; color: #000000"><div aria-label="Compose body"><a href="http://electronicdesign.com/blog/wireless-101-basic-physics-radio?NL=ED-001&Issue=ED-001_20160317_ED-001_502&sfvc4enews=42&cl=article_1_b&utm_rid=CPG05000000265010&utm_campaign=5427&utm_medium=email&elq2=12f9c87fc7fb48d38e0a6914011d57c4">http://electronicdesign.com/blog/wireless-101-basic-physics-radio?NL=ED-001&Issue=ED-001_20160317_ED-001_502&sfvc4enews=42&cl=article_1_b&utm_rid=CPG05000000265010&utm_campaign=5427&utm_medium=email&elq2=12f9c87fc7fb48d38e0a6914011d57c4</a></div><div aria-label="Compose body"><br></div><div aria-label="Compose body">I just read through this and haven't researched it. Back in the dark ages when I was designing mirowave systems for</div><div aria-label="Compose body">a liviing, FSPL was given as 36.6 + 20 log D + 20 log f. This paper gives a different value. I don't know why, since the</div><div aria-label="Compose body">physical constants haven't changed, and maybe some day I'll look into it.</div></div></body></html>