11ghz can do 2 foot from what I hear. But isn't an unlicensed 23 a good choice?
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mar 21, 2012 9:40 PM, "Fred Goldstein" <fgoldst...@ionary.com> wrote: > At 3/21/2012 03:56 PM, Tom DeReggi wrote: > > Are both 18Ghz and 11Ghz limited to minimum 2ft dish size? > > Just wondering if 1ft was allowed? > > > > > I know, some might ask "why"? Because its for a really short link (200 ft) > that has to be 350mb+ FDX, but dont want to use 60G millimeterwave, because > the viable mounting options are not stable enough to prevent sway and > safely reliably support that tight of a narrow beamwidth. > I'm pretty sure, I'll end up doing this in 23G, which allows 1ft dish, > (similar beamwidth to 11G with 2ft). But just wanted to double check rules > for 18 and 11. > > > > I don't think you can do it. 47CFR 101.115 says that both the 11 and 18 > GHz bands need 38 dB antenna gain, same as 6 GHz. Since that's a 6 foot > dish at 6 GHz, it would be 2 feet at 18 GHz. The 11 GHz band allows 33.5 > dB gain in some uncongested areas, but that still won't get you down to a > foot. 23 GHz only requires 33.5 dB. > > Alex has a good idea to look at 24 GHz unlicensed, if you can find a fast > enough radio. Ohterwise, if you can't deal with higher frequencies or free > space optics, stick with your instinct and go with 23 GHz. > ** > > ** -- > Fred Goldstein k1io fgoldstein "at" ionary.com > ionary Consulting ** **** ** http://www.ionary.com/ > +1 617 795 2701 > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > >
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