[amsat-bb] Re: S band interference solution
k8ocl at hotmail.com
Thu Oct 5 10:40:47 PDT 2006
I am happy to report that I get along with my neighbors very well, thank
so none of these TVI-type suggestions were any problem whatsoever at this
Have you ever read any texts from the ARRL, etc. on how to manage a TVI
They are not as popular as they once were, but you can still find them
They will help you in the social skills areas, another big weak point for
>From: Nate Duehr <nate at natetech.com>
>To: AMSAT-BB at amsat.org
>Subject: [amsat-bb] Re: S band interference solution
>Date: Thu, 05 Oct 2006 10:39:00 -0600
>John Champa wrote:
> > I really do get bored reading about all these threats to Mode S from
> > etc.
> > NOT!
> > These are 100 mW devices...maximum! That means they have to be
> > close to your QTH for you to hear them.
>I've got one here that will happily do 250mW all day long... not that I
>run it that way. All it took was some alternate firmware to bypass the
>normal firmware's limits. However, 28mW is plenty to cover my house.
> > 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.
>4a. Explain to the nice Sheriff's deputy why you're walking around the
>neighborhood and into neighbor's yards with a laptop.
>4b. Call your wife and ask her to come pick you up from jail. Explain
>to wife on the way home that you're not a "terrorist" as the Sheriff's
>summons for your later court date indicates.
> > 5. Knock on his door and ask him to change his AP to a channel 7 - 11
> > (outside the Ham Band)
>5a. Listen to 1/2 hour tirade about how this guy bought the thing at the
>local Best Buy and they never told him about the ham band, and how he
>saw a UFO fly past your tower one night.
>5b. Another 15-30 minutes talking about "What's that tower for, anyway?"
>5c. Spent an hour in his basement with him, helping him click on simple
>web interfaces after you reset his router to a default password and have
>to set it up from scratch because he's forgotten his password... which
>turns out to be "beerrules" and is found on a Post-It note on the bottom
>of the router AFTER you've already reset it to factory defaults.
> > 6. Reason: He's interfering with a licensed radio service (be nice!).
>6a. If you were dumb enough to point this out to Joe Sixpack, expect
>another 1/2 hour explaining Part 15. If you're lucky, Joe will offer
>you a beer at this point.
>6b. If you're *REAL* lucky he might be interested in ham radio. (This
>is about the only good that can come of this.) Spend another hour today
>and many more Elmering. (Yay!)
> > 7. Return to your radio room and operate Mode S until LOS.
>7a. The satellite passed over long ago and it's time for bed anyway.
>7b. Alternatively Joe may have you "help me fix my computer while you're
>here", and you'll spend at least one weekend a month at the neighbor's
>house or another neighbor's house (once word gets around) dealing with
>their computer problems, virii, and other technical duties now that
>you're the "friendly computer guy in the big white house over there!"
> > This is child's play guys! These are consumer grade wireless devices,
> > super computers.
> > Fixing such local QRM issues is easier than solving the old fashioned
> > problems.
>No. The average public at least understood how their TV worked, or at
>least how to adjust a pair of rabbit ears. WiFi is "deep voodoo black
>magic" to the vast majority of the population in most neighborhoods
>today. They think they paid for a system that works perfectly, 100% of
>the time and they have their own "channel". Some have heard enough to
>turn on the WEP encryption in their routers (crackable, easily).
>(Heck I've seen Engineers where I work stare and boggle at a simple
>Radio Frequency Spectrum chart, like the one you can download and print
>out from the NTIA. They always ask: "So where's my cell phone on here?")
> > 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
> > buy him a replacement
> > cordless phone of any type he would like EXCEPT one on 2.4 GHz. That is
> > cheap
> > solution. They're usually not more than $79.95 while you probably have
> > multiple Ks of $
> > invested in your satellite ground station.
>Yeah - move 'em up to 5.8 GHz! Oh... wait...
>Maybe down to 900 MHz... Oh, oops... some of us are there too... hmmmm...
> > For a bunch of supposedly sophisticated wireless guys, you sure don't
> > beans about
> > consumer grade wireless devices. That includes our wonderfully
> > but pessimistic AMSAT satellite engineers!
>I know plenty about them and know I'll end up the neighborhood tech
>support guy for them if I even THINK about talking to a neighbor about
>them. That and their utterly broken Windows 98 machines they THINK they
>need. Thanks to mass marketing... "Your child will be smarter if you
>buy them our operating system!" (No, it has nothing to do with genetics
>or the fact there isn't a single book in the house!)
> > Now get on with the work, and get those birds into orbit! (HI).
>Ditto on that, at least! :-)
> > Vy 73,
> > John Champa, K8OCL
> > AMSAT Life Member 1069
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