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Re: [TowerTalk] OT: Satellite Internet

To: Ryan Jairam <>
Subject: Re: [TowerTalk] OT: Satellite Internet
From: Charles Coldwell <>
Date: Fri, 27 Aug 2010 10:19:21 -0400
List-post: <">>
On Fri, Aug 27, 2010 at 9:30 AM, Ryan Jairam <> 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)

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