Date: Tue, 22 Oct 2002 09:46:58 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: agapon@excite.com Cc: freebsd-mobile@FreeBSD.ORG Subject: Re: WMP11 and txpower Message-ID: <20021022.094658.104604595.imp@bsdimp.com> In-Reply-To: <20021022111541.Q29633-100000@edge.foundation.invalid> References: <20021022111541.Q29633-100000@edge.foundation.invalid>
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In message: <20021022111541.Q29633-100000@edge.foundation.invalid>
Andriy Gapon <agapon@excite.com> writes:
: From what I was able to find on the Internet, it seems to be possible to
: control output power of WMP11. Is there any way to do this on FreeBSD ?
: Linux (hostap?) driver control utility seems to have txpower option for
: this purpose.
In -current the kernel part of this are in the tree. The userland
parts are in my tree, but haven't been committed yet. I'll be merging
it into -stable soonish.
Also, the Linux driver gets the power wrong. The numbers that you
give it are pure fiction. It seems to think that these cards have
60dB of dynamic range, when the actual range is closer to 10-20dB. My
cards seem to do about 100mW at max power, and about 5mW or 10mW at
the low end, but these numbers are judged based on the link quality
that we're seeing at the other end. 60dB of power control is pure
fiction, since at the lowest power we're still transmitting power.
Also, if you are looking to REDUCE power, you are likely OK. If you
are looking to INCREASE power, you are putting yourself at risk of
exceeding FCC spectrum regulations. This can result in very bad
things happening to you if you are caught.
Warner
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