Re: [amsat-bb] Part 15 Wi-FI

[Jim White <jim@xxxxxxxxxxxxxxxxxxxxx>]

At the Air Force Academy in Colorado Springs, CO, we are unable to hear 
AO-40 well enough to operate its digital modes due to extensive 802.11 
interference.  For the analog modes we can occasionally hear well make 
contacts when conditions are optimum, which is so seldom we don't even 
try.  The equipment is a 4.5' dish on the roof of the academic 
building.  When we point the dish at various other buildings the 802.11 
signals are much stronger but there is so much of it we can't differentiate 
what signal is coming from what building or room.  And the signals are so 
extensive and pervasive they wipe out the AO-40 downlink even when the dish 
is pointed up and away from the main buildings.

We have looked at this spectrum with a spectrum analyzer and find the noise 
floor from 802.11 devices to be 8 to 30 dB above the sky noise below the 
802.11 band.  That's enough to wipe out any weak signal whether from a 
satellite or terrestrial source.

Bottom line is at that location 802.11 devices make it impossible to 
operate against a licensed satellite.

Jim White
Colorado Satellite Services
jim@coloradosatellite.com

At 03:33 PM 07/29/2002 -0700, you wrote:

>The following is a request from a friend active in a local 802.11b Wireless
>Network project.   He's looking for stories of actual interference between
>the systems.
>
>Thanks,
>Bill - WA7NWP
>
>=====
>
>Has anyone had any problems talking to AO-40 due to 802.11b gear?
>
>
>***************
>The ARRL Letter
>Vol. 21, No. 29
>July 26, 2002
>***************
>
>* Review under way of unlicensed 2.4 GHz systems: The AMSAT-NA Board of
>Directors is reviewing the large number of unlicensed systems active in
>the 2.4-GHz band.
>
>----
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