Re: Maximum Transmit Power for channel 36 ,40,44 and 48

From: "KAVITA MATHUR" <kavitam@cdot.in>
To: Sebastian Gottschall <s.gottschall@dd-wrt.com>,
	ath10k@lists.infradead.org, ath9k-devel@qca.qualcomm.com
Subject: Re: Maximum Transmit Power for channel 36 ,40,44 and 48
Date: Tue, 21 Mar 2017 09:29:28 +0530	[thread overview]
Message-ID: <20170321035242.M12518@cdot.in> (raw)
In-Reply-To: <0f6c7cd6-5925-61ea-2b65-98023aba4f57@dd-wrt.com>

Hi,

But I got 13 dBm for 20 MHz channel(HT20), mcs 7. And I got 18dBm for 40 MHz
channel(HT40), mcs 15. In both cases, I have set channel 36.

If I change channel 36 to 149, I always get 20dBm for all the modes(legacy,HT-20 and HT-40).

I am using country IN in my hostapd configuration file, which gives following limitation:

country IN: DFS-JP
        (2402 - 2482 @ 40), (20)
        (5170 - 5250 @ 80), (20), AUTO-BW
        (5250 - 5330 @ 80), (20), DFS, AUTO-BW
        (5735 - 5835 @ 80), (20)
Can I change the calibration data? How can it be done?

Thanks & Regards,
KAvita

On Mon, 20 Mar 2017 11:45:16 +0100, Sebastian Gottschall wrote
> Am 20.03.2017 um 09:25 schrieb KAVITA MATHUR:
> > Hi,
> >
> > Chipset : AR9220
> > RF module : WLM200NX and WLM200N5
> > Linux Kernel : 3.12
> > ath9k driver : backport4.4.2-1
> >
> > With above combination , I have measured maximum transmit power 13 dBm for channel
> > 36,40,44 and 48. While it is 20 dBm for channel 149 and other 5GHz band channels
> >   as well as for 2.4 GHz channels.
> >
> > If I try to set txpower using iwconfig wlan0 txpower 20 , it gives no error.but it shows
> > only 13dBM.
> >
> > How I can change the txpower for channel 36,40,44 and 48?
> the maximum availale txpower depends on the calibration data which is 
> stored within the cards owm eeprom and is also related to the current 
> used mcs set / wireless rate.
> as higher the rate is as lower the transmission power will be
> according to the datasheet the rate for ht40 5 ghz for this card is 14 
> dbm at MCS 7 / 15 with a tollerance of +- 2 dbm
> 
> https://www.pcengines.ch/pdf/wlm200n5-23.pdf
> 
> Sebastian
> 
> > Please help me on this.
> >
> > Thanks & Regards,
> > कविता माथुर Kavita Mathur
> > वरिष्ठ अनुसंधान अभियंता  Senior Research Engineer
> > सी-डॉट                      C-DOT
> > इलैक्ट्रॉनिक्स सिटी फेज़ I         Electronics City Phase I
> > होसूर रोड, बेंगलूरु               Hosur Road, Bengaluru – 560100
> > फोन  Ph 080-28529896
> > Disclaimer:
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> > This email and any files transmitted with it
> >
> >
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> 
> -- 
> Mit freundlichen Grüssen / Regards
> 
> Sebastian Gottschall / CTO
> 
> NewMedia-NET GmbH - DD-WRT
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Thanks & Regards,
कविता माथुर Kavita Mathur 
वरिष्ठ अनुसंधान अभियंता  Senior Research Engineer 
सी-डॉट                      C-DOT
इलैक्ट्रॉनिक्स सिटी फेज़ I         Electronics City Phase I
होसूर रोड, बेंगलूरु               Hosur Road, Bengaluru – 560100
फोन  Ph 080-28529896
Disclaimer:
----------
This email and any files transmitted with it

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