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Subject: Re: ath9k driver - is it possible to disable tx/rx radio chains?
To: =?UTF-8?Q?H=c3=a5vard_Rabbe?= <hrabbe@me.com>,
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From: Matthias May <matthias.may@neratec.com>
Message-ID: <8cf52994-eda4-d88f-a236-2b74c085bf3f@neratec.com> (sfid-20170818_090836_524735_BF37653B)
Date: Fri, 18 Aug 2017 09:00:27 +0200
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On 18/08/17 01:32, Håvard Rabbe wrote:
> Hi
> I’m using wifi card with AR9280 chipset that uses the ath9k driver.
> 
> The card has 2 available radio chains and I’m only going to connect 1 antenna.
> 
> Is it possible to disable the radio chain im not using?
> 
> 
> Best Regards,
> 
> Håvard Rabbe
> 

Help text from iw:
phy <phyname> set antenna <bitmap> | all | <tx bitmap> <rx bitmap>

You can set the rx/tx mask with
iw phy phy0 set antenna 1
to not use the second chain

or
iw phy phy0 set antenna 1 3
to not use the second chain for tx, but still use it for rx.

You can see the currently active mask with:
iw list | grep Antenna

Be aware that the value set here is a bitmask only allows the values 1/3/7 (for 1, 2 and 3 chains).
Chain 0 is always active.
--> You can not disable chain 0 and only use chain 1.

BR
Matthias