Mike, First, take everything I saw about this with a grain of salt, because I'm no expert.
From my reading of the R&O, there are two types of whitespace device. There is a low power version, that I think is intended to be like a mini-PCI card, installed in a laptop. There are no height restrictions on that. Probably of more interest to us are the higher power devices (up to 4 watts, I think). Those are limited to antenna heights between 10 and 30 meters. I don't think the AP is special, it also has to be minimum 10m high. So it couldn't be on the ground. Personally, I wonder about this 10m minimum. Since all the devices are networked, I would argue that maybe 50% of an APs clients could be lower. One of the higher radios could pick up a new tv signal and force the whole AP to move channels. That would avoid the silly looking large antenna 15' above a single story ranch house roof. Perhaps if this stuff takes off, we could argue for that in the future. (or maybe I'm all wrong, since I'm more a software guy) -John On Oct 23, 2009, at 4:01 PM, Mike wrote: > Thanks guys for sharing the height thing. Such restrictions on the > "production" plan won't work. If the goal is to allow such use in an > urban setting, the modulation technique would have to be able to > survive severe multipath. I'll have to think about the AP on the > ground and the client on the roof. Does that make sense? It would > certainly keep interference to the AP down. -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
