[amsat-bb] Re: S band interference solution

John Champa k8ocl at hotmail.com
Thu Oct 5 05:21:01 PDT 2006

I really do get bored reading about all these threats to Mode S from WiFi, 


These are 100 mW devices...maximum!  That means they have to be relatively
close to your QTH for you to hear them.

1. Pick up your old laptop, or borrow one.
2. Plug in a Linksys wireless PC card from Radio Shack.
3. Download the free NetStumbler shareware.
4. Find the source of the Wifi QRM.
5. Knock on his door and ask him to change his AP to a channel 7 - 11 
(outside the Ham Band)
6.  Reason: He's interfering with a licensed radio service  (be nice!).
7. Return to your radio room and operate Mode S until LOS.

This is child's play guys!  These are consumer grade wireless devices, not 
super computers.
Fixing such local QRM issues is easier than solving the old fashioned TVI 

The most troublesome devices I have found , even to WiFi, are 2.4 GHz 
cordless phones.
In that case the only solution I have found is to go next door and offer to 
buy him a replacement
cordless phone of any type he would like EXCEPT one on 2.4 GHz.  That is a 
solution.  They're usually not more than $79.95 while you probably have 
multiple Ks of $
invested in your satellite ground station.

For a bunch of supposedly sophisticated wireless guys, you sure don't know 
beans about
consumer grade wireless devices.  That includes our wonderfully dedicated 
but pessimistic AMSAT satellite engineers!

Now get on with the work, and get those birds into orbit!  (HI).

Vy 73,
John Champa, K8OCL
AMSAT Life Member 1069

>From: Luc Leblanc VE2DWE <lucleblanc6 at videotron.ca>
>To: AMSAT-BB at amsat.org
>Subject: [amsat-bb] Re: S band interference solution
>Date: Wed, 04 Oct 2006 23:51:30 -0400
>On 4 Oct 2006 at 20:11, Tim Tapio wrote:
> > Lets see....intentionally jamming another radio service??  I think not.
> >
> > K4SHF
>See to who they can sell their things first and if you can get one of them 
>and still afford the
>price you will be able to use it to experiment only. There is also some 
>2.4GHZ muticoupler with up
>to 10 inputs who show up time to time on ebay if you feed them with 7 cheap 
>wi-fi router each of
>them on a different channel and you can feed the output through an 
>amplifier and on an omni high
>gain wi-fi antenna you will be able to experiment which one is making the 
>better job...
>The last one can be very disturbing that's why you will operate it for a 
>very short period for an
>experimental purpose only!
>Could be someone can provide an exterminator kit oups i want to wrote an 
>experimenter kit for those
>who are not satisfied playing with a variac and a microwave oven with no 
>door plus a door latch
>disable in their attic.
>Fisherman are very patient as the fish is harder to cook with this method 
>but it's legal aside of
>using an unsafe oven.
>Yes it is a JOKE don't ever try to do that its dangerous but you can share 
>your ideas and
>experiences with us. The use of a former ao-40 antenna can provided some 
>added gain and
>directivity. You will be surprised how far you can go between 2 points and 
>how quit the place
>became when you will listen 2 weeks after.
>P.S. Is someone hit you on a side of your face turn your head to present 
>him the other side...amen.
>Do what i tell not what i do a guy wearing a pair of sandals ever said.
>Signed.. The colonel Sanders in the Asterix village.
>The medium is the message...The content is the audience...;)
>Luc Leblanc VE2DWE
>WAC basic,CW,Phone,Satellite
>Skype VE2DWE
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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