[geeks] Air filter material?

[Lionel Peterson]

>From: der Mouse <mouse at Rodents.Montreal.QC.CA>
>Date: 2007/01/12 Fri AM 12:13:44 CST
>To: The Geeks List <geeks at sunhelp.org>
>Subject: Re: [geeks] Air filter material?

>>> I doubt many mobile wifi setups pump out 4W.
>> It depends upon the beam width. If you take a 100mW signal from an
>> omnidirectional antenna (a sphere) and reduce the beam width 40
>> times, then it's over the limit.
>
>...huh??  A watt - or milliwatt - is a unit of power, not of
>power-per-cross-sectional-area.  100mW is 100mW, whether it's radiated
>omnidirectionally or in a perfectly collimated beam the size of your
>finger.  (I suppose it's possible the regulations actually specify
>power per cross-sectional area at some standardized distance, but I've
>never seen any indication of it and see no reason they would.)

I thought Part 15 dealt with Effective Radiated Power (ERP), other services (Ham, CB, etc.) deal with input power to the finals, and not the ERP...

That's what I recall anyway...

Lionel