Hi,
my main problem isn't the 17dBm on the lower 5ghz channels. I can
happily use a higher channel with DFS and 250mW (which seems to be the
hardware limit).
My main problem is the DFS implementation which seems to limit 2.4ghz to
a lower value:
I have two similar regulatory entries:
country DF: DFS-FCC
(2402 - 2472 @ 40), (30)
(5170 - 5250 @ 80), (17), AUTO-BW
(5250 - 5330 @ 80), (23), DFS, AUTO-BW
(5490 - 5730 @ 160), (23), DFS
(5735 - 5835 @ 80), (30)
country DG: DFS-ETSI
(2402 - 2472 @ 40), (30)
(5170 - 5250 @ 80), (17), AUTO-BW
(5250 - 5330 @ 80), (23), DFS, AUTO-BW
(5490 - 5730 @ 160), (23), DFS
(5735 - 5835 @ 80), (30)
root@ap02:~# iw reg set DF
root@ap02:~# iwinfo wlan0 txp
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)
21 dBm ( 125 mW)
22 dBm ( 158 mW)
23 dBm ( 199 mW)
24 dBm ( 251 mW)
25 dBm ( 316 mW)
26 dBm ( 398 mW)
27 dBm ( 501 mW)
* 28 dBm ( 630 mW)
29 dBm ( 794 mW)
root@ap02:~# iw reg set DG
root@ap02:~# iw phy phy0 set txpower fixed 2000
root@ap02:~# iwinfo wlan0 txp
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)
21 dBm ( 125 mW)
22 dBm ( 158 mW)
23 dBm ( 199 mW)
24 dBm ( 251 mW)
25 dBm ( 316 mW)
26 dBm ( 398 mW)
27 dBm ( 501 mW)
28 dBm ( 630 mW)
29 dBm ( 794 mW)
root@ap02:~#
You see what I mean? The problem is not the power level in the
regulatory database. The problem is that the software thinks it's right
to limit it to 17dBm. It also does not depend which antenna gain is set
via iw of what power levels are defined in the regulatory database.
Everything higher than 17dBm is ignored and set to 17dBm, on 2.4Ghz.
Since the only difference is the DFS regulatory information, I think the
part parsing those information from the database is faulty. Maybe it
thinks that it's okay to limit it to 17dBm because DFS is not used on
2.4Ghz, which is sonsense.
I don't think that any part in hardware is causing the problem. I can
use higher power levels on 2.4Ghz when using DFS-FCC or no regulatory
limitations at all.
Thanks
Nico
On 07/30/2015 06:08 PM, Gerald Matzka wrote:
Ben is right, take a look at
https://forum.openwrt.org/viewtopic.php?id=42197
In newer Openwrt versions the kernel modules are compiled to respect the
reg-domain settings programmed in hardware.
Kind regards
... sent from my iPhone
Am 30.07.2015 um 17:11 schrieb Ben West b...@gowasabi.net
mailto:b...@gowasabi.net:
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
mailto: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
mailto: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
