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Re: Re: QRM ON 2.4 GIG





2 meters is quieter at my house than 2.4 GHz

Maybe mode B really is the way to go!

73,
Joe
ka0yos@amsat.org

>From: "Wayne Estes W9AE" <w9ae@earthlink.net>
>To: "Rick Fletcher" <rfletcher@plumdragon.com>, <amsat-bb@AMSAT.Org>
>Subject: Re: [amsat-bb] Re: QRM ON 2.4 GIG
>Date: Sat, 16 Mar 2002 15:41:25 -0600
>
>Rick Fletcher wrote:
>
> > Good chance it's one of the 2.4GHz wireless phone systems.  I have one 
>in
>my
> > house (had it for a while before I got onto AO-40) and I have to power 
>it
> > down to work AO-40.  It puts out strong pulses approximately once a 
>second
> > which is an announcement message to any handsets within it's operating
> > perimeter.  I also have an 802.11b wireless LAN system at home, but it 
>has
> > never been a problem.
>
>Wayne replies:
>
>What's the frequency range of the 2.4 GHz cordless phones?  It may not be
>very practical to build a bandpass or notch filter if the frequency is very
>close to 2401 MHz.
>
>In my case, the offending pulses are to my southwest.  The nearest 
>structure
>in that direction is about 1/4 mile away.  But I'm sure a dish could hear a
>2.4 GHz cordless phone much further away than that.
>
>My immediate area has a relatively low population density (a combination of
>empty fields and acre lots).  2.4 GHz interference must be much worse in
>more densely populated areas.  I only hear one pulse (one phone, I 
>suppose),
>and it only degrades AO40 reception when the dish is pointed to the
>southwest.  With the noise blanker on the pulse is barely audible when the
>antenna is pointed in other directions.  I suppose that over time more
>neighbors will start using these phones and I will get much more
>interference.
>
>Wayne Estes W9AE
>Mundelein, IL, USA
>
>
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