The FCC is doing testing for the use of broadband wireless in the space between TV channels. See http://www.pcmag.com/article2/0,2704,2250638,00.asp.
The challenge is kind of like BPL: preventing interference with any adjacent digital channels. From my reading, it looks like they are trying to sense when adjacent channels are in use and not use that space. This makes sense for a commercial product since it would be a challenge to get users to configure systems to avoid active channels. I wonder if we could get some channels made available for hams? Possible propose using specific whitespaces on a regional basis. The proposal would determine two open channels in an area and use the whitespace between them. For example, channels 18 and 19 here in Houston are not used so they would be an available whitespace. (I am not sure how the digital channel assignments change availability of whitespace.) Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net
