On Fri, Aug 27, 2010 at 9:30 AM, Ryan Jairam <firstname.lastname@example.org> wrote:
> DBS systems (for TV) use frequencies around 12GHz. I think they are
> using higher freqs now with the new Ka birds for HD.
> Wildblue internet transmits 29.5 to 30 GHz, receives 19.7 to 20.2 GHz
I think the water-vapor absorption line is at 22.2 GHz, and that this
also marks the boundary between Ku and Ka (under and above, get it?).
So their downlink is a bit close, but I don't know how broad the line
is, or what the mechanisms for broadening it are (Doppler in high
Charles M. Coldwell, W1CMC
"Turn on, log in, tune out"
Belmont, Massachusetts, New England (FN42jj)
GPG ID: 852E052F
GPG FPR: 77E5 2B51 4907 F08A 7E92 DE80 AFA9 9A8F 852E 052F
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