[GRLUG] NOT LINUX - FCC to vote on net neutrality later today.

[Bob Kline]

Yup.  Most routers have a small range
of closely spaced frequency options one
can try to avoid local interference.  "6" is
the default choice.  Microwave ovens are
not supposed to leak, even though the
power is high.  Cordless phones could be
another issue.

There is a dual band version of 802.11n,
which tries even more ways to get the
signal through.

4W is enough power for a micro station.
I suppose the increasing range of routers
is another reason outfits like Comcast and
AT&T are looking at byte limits - people can
pick up a signal easily today, unless
encryption is use, and many don't bother
with it.

But there are possibilities here as far as
sharing a high speed link.

   -- Bob




On Wed, Dec 22, 2010 at 9:26 PM, Michael Mol <mikemol at gmail.com> wrote:

> One more thing of note. The ISM bands (of which 900MHz, 2.4GHz and
> 5GHz are examples) don't require a license to transmit on, as long as
> the transmissions meet certain criteria. Primarily, these criteria
> revolve around not interfering with others' use of spectrum, and talk
> about limits on effective power transmission. (I believe 4W effective
> is the upper limit for omnidirectional broadcast.)
>
> What that means is that while a broadcaster's license has additional
> privileges and restrictions, it doesn't apply if you operate in ISM
> bands with low enough power output. That's why your average kid can
> operate a remote-control toy car, anyone is allowed to set up their
> own wireless network--and anyone can have a home microwave. (Your
> microwave operates in the 2.4GHz band, and has shielding to reduce
> leakage.)
>
> You might also notice that 900MHz, 2.4GHz and 5GHz are common labels
> for in-home cordless phone sets; that's not a coincidence. 802.11a,
> and the upper portion of 802.11n, sit in the 5GHz band. 802.11bg, and
> the lower portion of 802.11n, sit in the 2.4GHz band.
>
> On Wed, Dec 22, 2010 at 9:05 PM, Bob Kline <bob.kline at gmail.com> wrote:
> > Interesting. Spurious broadcasts
> > long been seen as serious.
> > Now, how about a 25 foot pole,
> > a server, and an 802.11n router,
> > with an outside range of as much
> > as 800 feet.  Just a $100 item.
> > You've got yourself a radio station.
> > Call it a micro station. The receiver can
> > be any of the "Internet radios" that are
> > increasingly common.
> >
> http://www.amazon.com/Sanyo-R227-Internet-Radio-Black/dp/B001O84M3I/ref=sr_1_1?ie=UTF8&s=electronics&qid=1293069719&sr=8-1
> > This one works wonderfully.  It has a
> > very sensitive receiver. I see the prices
> > has actually gone up, so it might be selling
> > well. Despite what the feedback says, it's
> > easy to set up.
> > There are many other models and
> > brands now.
> >    -- Bob
> >
> > On Wed, Dec 22, 2010 at 8:54 PM, Michael Mol <mikemol at gmail.com> wrote:
> >>
> >> They require periodic renewal. (Mine's good for ten years) They may
> >> also be revoked, such as if one breaks regulations badly enough that
> >> someone cares. I gather this only happens in practice if you're
> >> recurringly the source of EM transmissions that interfere with others'
> >> use of spectrum, or that are prohibited and manage to jostle someone
> >> into complaining.
> >>
> >> On Wed, Dec 22, 2010 at 7:46 PM, Bob Kline <bob.kline at gmail.com> wrote:
> >> > Had?  Again, do they expire?
> >>
> >>
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