Re: Here's a question for you radio experts (Buck)?

[Neil Palmer <neilpalmer400mr@xxxxxxxx>]

Erm, the signals are bouncing off the Sun ?   ;-)

Neil Palmer, Cambridge, Ontario, Canada

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--- On Tue, 6/10/08, sjl <sjl_abc@xxxxxxxxxxx> wrote:

> From: sjl <sjl_abc@xxxxxxxxxxx>
> Subject: [PCTECH] Here's a question for you radio experts (Buck)?
> To: pctech@xxxxxxxxxxxx
> Received: Tuesday, June 10, 2008, 4:39 PM
> I have been using AT&T cellular wireless broadband
> service on my laptops for 
> several years now.
>
> I currently have a Sierra Wireless 881U (USB-type) wireless
> adapter.  I 
> previously had a Sierra Wireless 875U (the
> previous-generation USB device), 
> both of which connected with a 10-foot USB cable so I can
> reposition the 
> device for best signal strength.  Before the USB devices I
> had a Sierra 
> Wireless 860 PCMCIA adapter with a third-party  external
> antenna on a 
> 10-foot extension cable.
>
> These wireless adapters will work in one of three different
> modes:
> EDGE is the old slow network
> 3G and HSDPA are the fast networks
>
> I have used all three of these devices at various times at
> the same site, 
> which is located approximately 5 miles south of downtown
> Fort Worth, Texas. 
> The building is in a low area on the campus, probably 10
> feet below street 
> level.
>
> Each day when I get to work, I must place my wireless
> device on the east 
> side of my cube in order to be connected to the HSDPA
> (Fast) network.
>
> However, somewhere between noon and 2:00 pm every day it
> automatically 
> switches to the EDGE (slow) network.  If I then reposition
> the wireless 
> device to the west side of my cube, it will then reconnect
> to the HSDPA 
> (Fast) network.
>
> (This behavior was also true of both the previous devices,
> including the 
> Sierra 860 PCMCIA adapter - once I repositioned the
> device/antenna, it would 
> reconnect to the fast network)
>
> Can one of you rocket scientists explain this phenomenon?
>  



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