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
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