Q: Is it normal to lose 15 decibels through a double-pane window?The storm blew down my 2.4Ghz WISP WiFi antenna ...So a friend stopped by to lend me his Ubiquiti AirGrid M2 Hi-Power (Tx 28dBm, Rx -97dBm) radio & 17x24-inch 20dBi antenna combination.He's only about a mile away so he opened up his Internet service to me to mooch off of until I could get my WISP antenna back in working order.The problem

Oooops. I hit the send keystroke before I was finished.Here is the picture of my temporary 2.4Ghz setup: I get -77 dB received signal on AirOS.INSIDE: I get -92 dB received signal on AirOS.The difference is that it won't work inside; but it works fine outside (just a foot or two away) on the deck outside the window.It's not the screen (as it's cloth and we tested that).It's the window (which we tested by opening it up).Since it's cold and windy on the deck, we would like to use the antenna inside. First we have to figure out WHY we lose 15 dB through a simple window!Can someone tell me why?

Is it normal to lose 15 dB @ 2.4Ghz through double-pane window glass?

Mar 24, 2012 21 Replies

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Jeff Liebermann 14 years ago

See section 1.2: "A similar cage was constructed as a control, with fiberglass screen, which is not conductive and which does not block RF signals, instead of aluminum."

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miso 14 years ago

Wow, that is tin foil hat territory. [Yes, I know the foil isn't tin anymore.] However, the Faraday cage test is probaly OK.

I have some near IR CCDs (response to 1um) and R72 filters. Looking at black stuff, you find black often isn't black under IR. Some black is completely transparent to IR, so I have to presume there are different ways to produce black items. Maybe the black that isn't transparent to IR has carbon in it.

According to this wiki (gasp), carbon black absorbs IR:

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