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> 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>: > > > > 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 > > _______________________________________________ > > openwrt-devel mailing list > > openwrt-devel@lists.openwrt.org > > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel > _______________________________________________ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel > -- Ben West http://gowasabi.net b...@gowasabi.net 314-246-9434
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