Subject: Re: setting power for wi(4)
To: Henry B. Hotz <firstname.lastname@example.org>
From: David Young <email@example.com>
Date: 01/06/2003 14:03:39
In some places, like the U.S., there are different EIRP limits for
point-to-point and point-to-multipoint links. Also, as you mention,
a high-gain antenna will reject noise from the sides and behind.
On Mon, Jan 06, 2003 at 11:48:23AM -0800, Henry B. Hotz wrote:
> At 8:17 AM +0100 1/2/03, Pavel Cahyna wrote:
> >In our country we have a regulation dictating that a wireless device
> >like this shall look from any direction like an isotropic source of
> >radiation with total power not exceeding ... (some value that I don't
> >remember; 100 mW maybe?) so if we focus the output by means of a
> >parabollic antenna, we must lower the power accordingly.
> I'm not up on regulations, but if the restriction is on EIRP (as it
> sounds) then once you get to an antenna that requires you to reduce
> your output you have nothing to gain by using a better antenna.
> In other words I think this only makes sense if 1) you don't have
> enough power though your standard antenna to reach the regulatory
> limit, or 2) you don't actually intend to adhere strictly to the
> regulation, or 3) you have some nearby interference which the
> regulations don't prevent (like bluetooth, or a cordless phone).
> I'm not an expert, but I hope you're not barking up the wrong tree here.
> The opinions expressed in this message are mine,
> not those of Caltech, JPL, NASA, or the US Government.
> Henry.B.Hotz@jpl.nasa.gov, or firstname.lastname@example.org
David Young OJC Technologies
email@example.com Engineering from the Right Brain
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