From: Felix Fietkau <nbd@openwrt.org>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-wireless@vger.kernel.org
Subject: Re: [PATCH 2/2] mac80211: implement support for configuring antenna gain
Date: Tue, 01 Oct 2013 13:14:31 +0200 [thread overview]
Message-ID: <524AAE97.5020708@openwrt.org> (raw)
In-Reply-To: <1380625512.14430.19.camel@jlt4.sipsolutions.net>
On 2013-10-01 1:05 PM, Johannes Berg wrote:
> On Fri, 2013-09-06 at 15:06 +0200, Felix Fietkau wrote:
>> Report the maximum allowable extra antenna gain to the driver to allow
>> it to reduce the tx power even further based on internal data
>
> I don't quite understand the maximum thing here - what's a user to do
> who has an antenna that goes over? Is that then intended to not be
> supported? That seems odd. A very high gain antenna might just result in
> signal distortions, but what's the reason for limiting it this way?
Very high gain antennas are useful for long distance links.
The signal is not distorted, but focused directionally, which can easily
make it exceed regulatory EIRP limits, unless tx power is reduced
appropriately.
If the user explicitly configures the gain of the directional antenna
using this patch, mac80211 will reduce the maximum allowed tx power
setting to stay within the legal limit.
- Felix
next prev parent reply other threads:[~2013-10-01 11:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-06 13:06 [PATCH 1/2] cfg80211: add support for configuring antenna gain Felix Fietkau
2013-09-06 13:06 ` [PATCH 2/2] mac80211: implement " Felix Fietkau
2013-10-01 11:05 ` Johannes Berg
2013-10-01 11:14 ` Felix Fietkau [this message]
2013-10-01 11:50 ` Johannes Berg
2013-10-05 11:18 ` Felix Fietkau
2013-10-07 8:29 ` Johannes Berg
2013-10-07 8:30 ` Johannes Berg
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