Does window glass have significant attenuation at GPS L1? What if it's a big window on a modern green office building and has some sort of coating/content to reduce IR transmission?
Google found an (expensive) paper from IEEE where the abstract said: At average, about 30 dB attenuation is observed from 800 MHz to 6 GHz so I assume the answer is mostly "sure does". Does anybody have more info? Is there a rule of thumb? (maybe X dB, or X dB/inch) Does it vary wildly from brand to brand of glass? ---------- Context is that I took some low cost consumer GPS toys when I visited a friend who had recently moved into a new office building. He's on the 4th floor, well above anything else on that side, so we had a clear view for half of the sky looking West or slightly North of West. We tried a SiRF III and a Sure demo board. I had forgotten to update the Sure clock the night before so it was having a hard time getting off the ground. We took everything outside where they locked up within a few minutes. Back inside with the antennas on a window sill, both just barely worked some of the time. The glass below the sill was a different color, slightly less yellow. We tried the lower (floor level) sill but didn't notice any difference. That wasn't a serious test with numbers and error bars, but we probably would have noticed if it had suddenly started working much better. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.