"Matthew S. Hallacy" wrote: > On Tue, Aug 06, 2002 at 10:21:18PM -0500, Neal wrote: > > > It is my opinion that precipitation should still be considered in > > calculating propagation reliability for both major nodes (operational > > fixed, i.e. Tower to Walker) and street downlinks (AP to mobile, i.e. > > Walker to Loring Park laptop). With some of the downpours and > > electromagnetic disturbances in the Cities, I would <not> rule out the > > effects of these conditions. > > > > I never had problems with rain even on the 20-something mile links, snow > wasn't a problem either. Fog, now that caused problems =) Not saying it > isn't possible, but the biggest concern was the wind from the storm tearing > apart the zip ties holding the antennas up =) It all depends on the length of the circuit, transmit power, receiver sensitivity, obstructions, etc. If your link was a generally clear radio line of sight, then all else being equal, it would've talked. Fog appears to be opague at 2.4 Ghz. That's going to be a problem. Parabolics will have a definite advantage over yagis and corner reflectors, IMHO. > The links should be setup so that a bird taking a dump on the > feed horn doesn't cause problems.. Loss(guano)= -10db. :-) There's still that loss between the local AP and the laptop. Even with a mobile antenna gain of 5db, coffee tables make <lousy> ground planes. That 5db may just bring the effective gain of the laptop antenna to unity.