The reason your wireless phones aren't interfering with your WiFi
network is because your phones are Frequency Hopping (FHSS).

Bluetooth is also FHSS, and will only interfere with WiFi networks if
there are large numbers or a large concentration of Bluetooth devices in
any given area.  This is because you'll have so many individual devices
all hopping to their on hop pattern. (Except the ones that are talking
directly to each other.)

For the most part, Bluetooth and 802.11a will coexist quite peacefully,
neither stomping on each other.



-----Original Message-----
From: tcwug-list-admin at [mailto:tcwug-list-admin at] On
Behalf Of Nate Carlson
Sent: Tuesday, July 02, 2002 4:43 PM
To: tcwug-list at
Subject: Re: [TCWUG] Bluetooth

On Tue, 2 Jul 2002, Chris Elmquist wrote:
> I think it's primarily an issue of front-end overload.  Whenever you
> Even though they are spread-spectrum, they also have a dynamic range
> which, in order to keep the cost at a point we are still interested
> in, is not what it could be in order to keep out the offending
> signal(s).
> You get the same behavior often when trying to run a 2.4 GHz cordless
> phone near your 802.11b stuff.  The phone just knocks the WLAN
> equipment right to zero... even though they are on different
> "channels" and use different spreading sequences, they're in the same
> passband and the poor receiver gets nailed by the nearby transmitter.

I've got 2 separate 2.4ghz phone systems at home, and don't see any
interference with my 2 802.11b AP's.. 'course, the phones are the
frequency-hopping type (FHSS?), so that could be why I don't get
interference there. I also didn't get any interference with either the
phones or the wireless 'net when I turned bluetooth to 'discoverable' on
my phone last night, but that may be because it's not actually putting
anything out.

Nate Carlson <natecars at>   | Phone : (952)943-8700                | Fax   : (952)943-8500

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