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

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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