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Re: [TowerTalk] Fwd: OT: Satellite Internet

Subject: Re: [TowerTalk] Fwd: OT: Satellite Internet
From: Charles Coldwell <>
Date: Fri, 27 Aug 2010 15:07:03 -0400
List-post: <">>
On Fri, Aug 27, 2010 at 2:15 PM, Charles Coldwell <> wrote:
> On Fri, Aug 27, 2010 at 1:56 PM,  <> wrote:
>> I believe they use something around 2.4 GHz, near the "water line". Please 
>> correct me if I'm wrong.
> 2.4 GHz is in the ISM band.  The water line is at 22.2 GHz.

Actually, I should have known to look in Wikipedia.  Quoting their "K
band" article:

"The IEEE K band is a portion of the electromagnetic spectrum in the
microwave range of frequencies ranging between 18 and 27 GHz. K band
between 18 and 26.5 GHz is absorbed easily by water vapor (H2O
resonance peak at 22.24 GHz, 1.35 cm)."

So quoting N2RJ upthread

"Wildblue internet transmits 29.5 to 30 GHz, receives 19.7 to 20.2 GHz"

It seems like their receive frequencies (is that the satellite
receiving or the ground station?) are nicely in the middle of a pretty
broad water vapor resonance.

I think I would stick to terrestrial stuff at 850/1900 MHz, or maybe
digital modes on the HF bands.

Charles M. Coldwell, W1CMC
"Turn on, log in, tune out"
Belmont, Massachusetts, New England (FN42jj)

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