4 ms·
With 60GHz it would take a storm with a rate of rain approaching 55mm (2") per hour to exceed a 20dB fade margin. That is quite a severe rain. A slight rain sho
by tssva 7y ago
With 60GHz it would take a storm with a rate of rain approaching 55mm (2") per hour to exceed a 20dB fade margin. That is quite a severe rain. A slight rain shower should not significantly impact a 1.5km link at 60GHz.
- walrus01 7y agoIn real world use if you want five nines availability of a 60 GHz link in Portland, OR, you need to keep the distance to about 700 meters or less. And it doesn't see really heavy rain showers (as Miami or Houston do), just constant drizzle. 300-400 meters max in Miami.
- jkilpatr 7y agoThat's why lots of options are shipping with 5ghz failover. Still not the best case to reduce bandwidth during heavy rain but at least it still works.
- BenjiWiebe 7y agoIn central Kansas we would see rainfall exceeding that rate multiple times a year. I've seen it as high as 12"/hour for a few minutes.
- danesparza 7y agoOh. My. At this point, I suppose you'd need Wifi for your boat? :-)
- JoshTriplett 7y ago12"/hour is 0.2"/minute, so that for a couple of minutes doesn't make for ridiculous overall rainfall. Signal quality is affected by the current momentary rate, and having the signal drop for seconds or minutes is problematic.
- grahamburger 7y agoIt's not so much the rain fade as the oxygen absorption that really gets you with 60Ghz[1]. You can get better distance and reliability with 70/80Ghz. They're expensive though. [1] https://www.rfglobalnet.com/doc/fixed-wireless-communications-at-60ghz-unique-0001 https://www.rfglobalnet.com/doc/fixed-wireless-communication...
- ggm 7y agobrisbane has 80-90% humidity and temps around 30 a lot of the time. what would persisting moist hot air do, to your rainfade?