What's more, The regulation is on the signal strength of the radiated
signal, not the transmitter power. so if you go to max transmitter power and add
a better antenna, you actually exceed the limits.
There is apparently an exception to this for point-to-point use. But you still
can't use full power + high gain antenna
David Lang
On Thu, 30 Jul 2015, Ben West wrote:
You can look up your respective country's spectrum regulations. It is
possible prior versions OpenWRT didn't fully conform to each regulatory
domain and were fixed in more recent versions (just as the converse is
possible).
For example, for the USA, here is a table of power limits for the 2.4GHz
and 5GHz bands. Channels 36-48 are limited to 16dBm transmitter power.
http://www.air802.com/fcc-rules-and-regulations.html
On Thu, Jul 30, 2015 at 3:32 AM, Nicola von Thadden <n...@vthadden.de>
wrote:
Hi,
I also thought to have used 20dBm or 23dBm in earlier releases (AA).
Is there a way to find out to which txpower levels the 5Ghz transceiver
is limited? I think the driver reads them out, maybe there is a way to
print them on the cmd?
But my main problem is the 17dBm on 2.4Ghz when setting DFS-ETSI
countries. I don't think that it is a problem of the hardware but of the
software parsing the regdom. Maybe there is a fixed limit of 17dBm on
non-DFS channels, even when DFS is not required, which is not very
useful. Does anyone have an idea where that could be set? My search in
the source code had no results until now, where it could be.
Thanks
Nico
On 07/29/2015 06:21 PM, Atanas Vladimirov wrote:
https://dev.openwrt.org/ticket/20201
On BB I used 20dBm for both 2.4 and 5GHz on the same router.
Sent with AquaMail for Android
http://www.aqua-mail.com
On 29 юли 2015 г. 18:40:10 Ben West <b...@gowasabi.net> wrote:
This is what I observe running Barrier Breaker on UBNT M5 products,
too. I believe the 17dBm limit is intentional, i.e. per regulation.
The 30dBm tx power limit applies to channels 149 and above, I believe.
Also (kind of off-topic): Do you know why 5Ghz channels 36-48 are
forced
to be 17dBm only on the WNDR3800? I found two possible explanations:
either because of the factory calibration
On Wed, Jul 29, 2015 at 10:25 AM, Gerald Matzka <mgeral...@yahoo.de
<mailto:mgeral...@yahoo.de>> wrote:
Well, it looks like the txpower of your wdnr3800 is limited to
17dBm because of the hardware reg-domain settings.
Kind regards,
... sent from my iPhone
> Am 29.07.2015 um 10:43 schrieb Nicola von Thadden
<n...@vthadden.de <mailto:n...@vthadden.de>>:
>
> Hi,
>
> I have this strange behaviour down below, for which I also opened
a
> ticket because I think this should not be like that ;)
>
> Does anyone have an idea where the problem could originate from
and how
> to fix it?
>
> Thanks
> Nico
>
>> On 07/29/2015 12:37 AM, OpenWrt wrote:
>> #20222: 2.4Ghz limited to 50mW in DFS-ETSI
>> ----------------------+----------------------------------
>> Reporter: nicoduck | Owner: developers
>> Type: defect | Status: new
>> Priority: normal | Milestone: Chaos Calmer (trunk)
>> Component: kernel | Version: Trunk
>> Keywords: wndr3800 |
>> ----------------------+----------------------------------
>> I have got a Netgear WNDR 3800 running with openwrt since quite
a while.
>> I now upgraded to the latest version (trunk) and wanted to use
WLAN within
>> the regulations here in Germany but also wanted to max out the
output
>> power (within the regulations).
>> Switching the country to Germany limits the maximum output
power to 17dBm,
>> although it does show as being limited on 20dBm:
>> root@OpenWrt:/# iwinfo wlan0 txpower
>> 0 dBm ( 1 mW)
>> 1 dBm ( 1 mW)
>> 2 dBm ( 1 mW)
>> 3 dBm ( 1 mW)
>> 4 dBm ( 2 mW)
>> 5 dBm ( 3 mW)
>> 6 dBm ( 3 mW)
>> 7 dBm ( 5 mW)
>> 8 dBm ( 6 mW)
>> 9 dBm ( 7 mW)
>> 10 dBm ( 10 mW)
>> 11 dBm ( 12 mW)
>> 12 dBm ( 15 mW)
>> 13 dBm ( 19 mW)
>> 14 dBm ( 25 mW)
>> 15 dBm ( 31 mW)
>> 16 dBm ( 39 mW)
>> * 17 dBm ( 50 mW)
>> 18 dBm ( 63 mW)
>> 19 dBm ( 79 mW)
>> 20 dBm ( 100 mW)
>>
>> What I did: reset the device, flash it with various builts from
trunk and
>> try to figure out what was going on.
>> I now modified my regdb and was able to isolate the source of
the problem:
>> country DE: DFS-ETSI
>> # entries 279004 and 280006
>> (2400 - 2483.5 @ 40), (100 mW)
>> # entry 303005
>> (5150 - 5250 @ 80), (200 mW), NO-OUTDOOR, AUTO-BW
>> # entries 304002 and 305002
>> (5250 - 5350 @ 80), (100 mW), NO-OUTDOOR, DFS, AUTO-BW
>> # entries 308002, 309001 and 310003
>> (5470 - 5725 @ 160), (500 mW), DFS
>> # 60 gHz band channels 1-4, ref: Etsi En 302 567
>> (57000 - 66000 @ 2160), (40)
>> Thas does not work and has the mentioned behaviour, 2.4Ghz is
limited at
>> 17dBm. It also does not depend on which values are set in the
regulatory
>> database for the 2.4Ghz channels, anything over 17dBm will be
limited to
>> 17dBm.
>> running "iw phy phy0 set txpower fixed 2000" gives no error but
does not
>> change it to 20dBm. Changing the value to anything below 17dBm
works
>> though.
>>
>> country DE: DFS-FCC
>> # entries 279004 and 280006
>> (2400 - 2483.5 @ 40), (100 mW)
>> # entry 303005
>> (5150 - 5250 @ 80), (200 mW), NO-OUTDOOR, AUTO-BW
>> # entries 304002 and 305002
>> (5250 - 5350 @ 80), (100 mW), NO-OUTDOOR, DFS, AUTO-BW
>> # entries 308002, 309001 and 310003
>> (5470 - 5725 @ 160), (500 mW), DFS
>> # 60 gHz band channels 1-4, ref: Etsi En 302 567
>> (57000 - 66000 @ 2160), (40)
>>
>> Thad does work. The only change to the entry above is "DFS-FCC"
instead of
>> "DFS-ETSI". I can now select any powerlevel between 1 and 20dBm
and it is
>> also reported as being used:
>> root@OpenWrt:/# iwinfo wlan0 txpower
>> 0 dBm ( 1 mW)
>> 1 dBm ( 1 mW)
>> 2 dBm ( 1 mW)
>> 3 dBm ( 1 mW)
>> 4 dBm ( 2 mW)
>> 5 dBm ( 3 mW)
>> 6 dBm ( 3 mW)
>> 7 dBm ( 5 mW)
>> 8 dBm ( 6 mW)
>> 9 dBm ( 7 mW)
>> 10 dBm ( 10 mW)
>> 11 dBm ( 12 mW)
>> 12 dBm ( 15 mW)
>> 13 dBm ( 19 mW)
>> 14 dBm ( 25 mW)
>> 15 dBm ( 31 mW)
>> 16 dBm ( 39 mW)
>> 17 dBm ( 50 mW)
>> 18 dBm ( 63 mW)
>> 19 dBm ( 79 mW)
>> * 20 dBm ( 100 mW)
>>
>>
>> I have no idea why but there seems to be a bug in the code
parsing the DFS
>> regulations, limiting 2.4Ghz to lot lower values than allowed.
Changing it
>> to DFS-FCC works for using the applicaple output power but does
not seem
>> to be in compliance which German law.
>>
>> Do you have an idea where the problem could be? I'm happy to
try out more
>> builds and future versions.
>>
>> Also (kind of off-topic): Do you know why 5Ghz channels 36-48
are forced
>> to be 17dBm only on the WNDR3800? I found two possible
explanations:
>> either because of the factory calibration (is it possible to
get them in a
>> human readable form somehow? The hexdump is not really readable
and I have
>> not been able to find the code which pases them) or because
these channels
>> are considered as "edge-channels" and someone thought it would
be safe to
>> limit the power, to not disturb any other systems running on
even lower
>> channels. The latter explanation is kind of weird because it
would make no
>> sense to limit these 4 channels but no other ones. I find it
especially
>> strange because that is typically the job of regulatory
authorities, to
>> define those power levels.
>>
>> --
>> Ticket URL: <https://dev.openwrt.org/ticket/20222>
>> OpenWrt <http://openwrt.org>
>> Opensource Wireless Router Technology
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Ben West
http://gowasabi.net
b...@gowasabi.net <mailto:b...@gowasabi.net>
314-246-9434
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