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<div class="moz-cite-prefix">Radar returns are very weak, and a
nearby device operating on a channel that is reserved (in Canada
and the US) for the radar can in principle look like the echo from
quite a large storm. <br>
<br>
--dave<br>
<br>
On 08/10/15 05:36 PM, Rosen Penev wrote:<br>
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cite="mid:CAKxU2N_tqXHvk+DE+mZvKV6MHnH=Rk_mOnVRz-JJt4KfqQcKMA@mail.gmail.com"
type="cite">
<p dir="ltr">How does a router that transmits at milliwatts
interfere with airport equipment? This seems like such an
isolated case. At the very least would it not require the
routers to be relatively close?</p>
<br>
<div class="gmail_quote">
<div dir="ltr">On Thu, Oct 8, 2015, 13:20 David Collier-Brown
<<a moz-do-not-send="true" href="mailto:davec-b@rogers.com">davec-b@rogers.com</a>>
wrote:<br>
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<div>Anyone who's an American citizen want to write a short
to-the-point response suggesting that this was vendor
error, caused by not using the database that linux uses
for wi-fi cards?<br>
<br>
I want them to have a public "out" from the current scheme
of telling the vendors to protect their code. <br>
<br>
I prefer to give the FCC the option of telling the vendors
to stop messing up their code, like a regulatory agency
would like to be seen doing (;-))<br>
<br>
About one page!<br>
<br>
--dave</div>
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<br>
<br>
On 08/10/15 04:11 PM, David Collier-Brown wrote:<br>
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<blockquote type="cite"> <font size="-1">From tlkingan at <a
moz-do-not-send="true"
href="http://tech.slashdot.org/comments.pl?sid=8141531&cid=50686561"
target="_blank"><a class="moz-txt-link-freetext" href="http://tech.slashdot.org/comments.pl?sid=8141531&cid=50686561">http://tech.slashdot.org/comments.pl?sid=8141531&cid=50686561</a></a><br>
<br>
<br>
And that's what the FCC really wants The problem the FCC
is seeing right now is the modified firmware allows
access to frequencies that aren't allowed to be used for
WiFI in the US. This is more than just channels 12 and
13 on 2.4GHz, but also on the complex 5GHz band.<br>
<br>
The FCC has many complaints already from airports and
other entities whose radar is being interfered with by
5GHz WiFi (the band plan is complex enough that channels
are "locked out" because they're used by higher priority
services like radar).<br>
<br>
And you really can't blame the open firmware guys either
- mostly because they don't know any better and they
only build one binary that works for all devices
worldwide. (the available channels on 5GHz vary per
country - depending on the radar in use).<br>
<br>
All the FCC really wants (and they've clarified it in
the Notice of Proposed Rulemaking) is the steps wifi
manufacturers are taking to prevent people from loading
on firmware that does not comply with FCC regulations -
i.e., allows transmissions on frequencies they are not
allowed to transmit on.<br>
<br>
It can either take place as hardware (filters blocking
out the frequencies), or software that cannot be
modified by the open firmware (e.g., firmware on wifi
chip reads a EEPROM or something and locks out those
frequencies).<br>
<br>
The thing it cannot be is rely on "goodwill" or firmware
that respects the band plan - i.e., you cannot rely on
"blessed" open firmware that only uses the right
frequencies (because anyone can modify it to interfere).<br>
<br>
The FCC has all the powers to enforce compliance right
now - users of open firmware who are caught creating
interference with higher priority services can already
be fined, equipment seized and all that stuff (and that
would not include just the WiFi router - any WiFi device
like PCs can be seized if they attach to that network).
That's the heavy handed legal approach they have.
However, they don't want to do that, because most users
probably don't realize the problem, and the FCC really
doesn't want to destroy all that stuff. So instead, the
FCC is working with manufacturers to fix the issue at
the source.<br>
<br>
The problem lies in the fact that most manufacturers are
cheap and will not spend a penny more, so instead of
locking out the radio from interfering, they'll lock out
the entire firmware.<br>
<br>
The FCC mentions DD-WRT and all that by name because
their investigations revealed that when they investigate
interference, the offending routers run that firmware
(and which doesn't lock out frequencies that they aren't
supposed to transmit on).<br>
<br>
<br>
</font> <br>
<pre cols="72">--
David Collier-Brown, | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
<a moz-do-not-send="true" href="mailto:davecb@spamcop.net" target="_blank">davecb@spamcop.net</a> | -- Mark Twain
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<pre cols="72">--
David Collier-Brown, | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
<a moz-do-not-send="true" href="mailto:davecb@spamcop.net" target="_blank">davecb@spamcop.net</a> | -- Mark Twain
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<pre class="moz-signature" cols="72">--
David Collier-Brown, | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
<a class="moz-txt-link-abbreviated" href="mailto:davecb@spamcop.net">davecb@spamcop.net</a> | -- Mark Twain
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