nanostation m2 28 dBm (Not Resolved) Please Guru's

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chris
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Joined: 06 Jun 2006
Posts: 101
Location: Germany, Bensheim

PostPosted: Wed Jan 04, 2012 17:00    Post subject: Reply with quote
Hi,

did you use the ath9k builds or carrier?

If

Code:

cat /sys/class/ieee80211/phy0/name


produces "phy0" you are on ath9k.

Please provide me the frequency you use and:

I would need then output from:

Code:

iwconfig


and

Code:

iwlist ath0 txpower

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woodbear
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Joined: 02 Jul 2011
Posts: 1

PostPosted: Tue Jan 10, 2012 21:40    Post subject: Reply with quote
root@Free-WiFi:~# cat /sys/class/ieee80211/phy0/name
phy0
root@Free-WiFi:~# iwconfig
lo no wireless extensions.

imq0 no wireless extensions.

imq1 no wireless extensions.

eth0 no wireless extensions.

eth1 no wireless extensions.

br0 no wireless extensions.

etherip0 no wireless extensions.

ath0 IEEE 802.11bgn Mode:Master Frequency:2.412 GHz Tx-Power=18 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off

mon.ath0 IEEE 802.11bgn Mode:Monitor Frequency:2.412 GHz Tx-Power=18 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on

bond0 no wireless extensions.

root@Free-WiFi:~# iwlist ath0 txpower
ath0 unknown transmit-power information.
walter48022
DD-WRT Novice


Joined: 13 Jun 2011
Posts: 16

PostPosted: Sun Jan 15, 2012 14:48    Post subject: Reply with quote
chris wrote:
Hi,

did you use the ath9k builds or carrier?

If

Code:

cat /sys/class/ieee80211/phy0/name


produces "phy0" you are on ath9k.

Please provide me the frequency you use and:

I would need then output from:

Code:

iwconfig


and

Code:

iwlist ath0 txpower


I have the same problem too, but using ubiquiti powerp-n.
The user "black6spdz" wrote this:

"most HP ubiquiti gear adds a +10db offset to the displayed TX level.. so 18db +/- 2db + 10db offset = 28-30dbm.. there is your 1000mW output"

I compared the airos 5.3.5 (@28db) and dd-wrt (@18db) in my home area and it work much better the dd-wrt, and where i have no signal, it happen with both. So I'm wondering if its just an annoying bug for eyes, because with my test it seem so. The user "black6spdz" he has so many ubiquiti device and I think his words are right, and maybe this offset bug happen also with other hardware when overtake 20db.
foolano
DD-WRT Novice


Joined: 08 Jan 2012
Posts: 8

PostPosted: Mon Jan 16, 2012 21:53    Post subject: Reply with quote
After much digging,

The power offset was implemented by airos because the airos madwifi driver was capped at reporting 18.

Ath9k? unknown at this point. If the offset was customized into the madwifi driver by ubiquiti, then why would ath9k/ddwrt have the same offset, unless it is hardware implemented.

DDwrt chris tested the output on both airos (modified madwifi) and ddwrt (ath9k) and said they were similar, and they should just release the db measurements to clear things up, and let the numbers speak for themselves.

One thing is for certain, ath9k has the same limitation of reporting at 18 dbm as madwifi.
walter48022
DD-WRT Novice


Joined: 13 Jun 2011
Posts: 16

PostPosted: Tue Jan 17, 2012 11:13    Post subject: Reply with quote
foolano wrote:
After much digging,

The power offset was implemented by airos because the airos madwifi driver was capped at reporting 18.

Ath9k? unknown at this point. If the offset was customized into the madwifi driver by ubiquiti, then why would ath9k/ddwrt have the same offset, unless it is hardware implemented.

DDwrt chris tested the output on both airos (modified madwifi) and ddwrt (ath9k) and said they were similar, and they should just release the db measurements to clear things up, and let the numbers speak for themselves.

One thing is for certain, ath9k has the same limitation of reporting at 18 dbm as madwifi.


I'm sorry for my bad english... but i don't get the mean... is it just a bug and the real tx power in the antenna plug is 28db (don't count the 10db offset).. or is real a problem and the antenna tx power is just 18db instead of 28db as with airos?
LOM
DD-WRT Guru


Joined: 28 Dec 2008
Posts: 7647

PostPosted: Tue Jan 17, 2012 15:37    Post subject: Reply with quote
foolano wrote:


One thing is for certain, ath9k has the same limitation of reporting at 18 dbm as madwifi.


The output power is set in the Atheros wifi chip but there is an external high-power amp between the wifi chip and the antenna.
A translation table (offset) is therefore needed so that the gui shows the real output power after the power amp.

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walter48022
DD-WRT Novice


Joined: 13 Jun 2011
Posts: 16

PostPosted: Tue Jan 17, 2012 16:16    Post subject: Reply with quote
LOM wrote:
foolano wrote:


One thing is for certain, ath9k has the same limitation of reporting at 18 dbm as madwifi.


The output power is set in the Atheros wifi chip but there is an external high-power amp between the wifi chip and the antenna.
A translation table (offset) is therefore needed so that the gui shows the real output power after the power amp.


Thx now it's all clear for me!!! Very Happy
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