[MLB-WIRELESS] Re: [mesh] Power limits of Class Devices (such as WiFi ones you may be using)

[Mark Allen]

Cowboy's Ha....

I've seen professional installations that dont even come close to the
quality I have seen in many amateur installations.... I hate it when big
business complains about something just to scare people into not using
something thats free for everyone....

But saying that, some people have been worrying me, using 31dbi gain dishes
with 100mw cards and 1/2Watt Amps to go 2-3 klms LOS.....

Oh well...

Mark Allen
MPAP
Brisbane Mesh Project
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Mark Allen -- Alarm Systems Service Technician
0408917504 -- 0738491939 -- 0738497228
Techncian -- ABC Alarms Pty Ltd
Operator -- MPAP, Brisbane Queensland
marka at abcalarms.com.au - redness at iname.com
BCL Reg - B10539QLD Adv Diploma of Info Tech
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----- Original Message -----
From: "evilbunny" <evilbunny at sydneywireless.com>
To: <syd-wireless at lists.sydneywireless.com>
Cc: <announcements at lists.sydneywireless.com>; <mesh at itee.uq.edu.au>;
<melbwireless at wireless.org.au>; <wireless at tas.air.net.au>
Sent: Sunday, August 11, 2002 3:25 AM
Subject: [mesh] Power limits of Class Devices (such as WiFi ones you may be
using)


> Hello syd-wireless,
>
> Community groups in general lately are copping a little bit of flak
> from companies such as IDS in Adelaide among others over us acting
> like cowboys, so I thought I'd do a little proactive rules and regs of
> RF posting... We wish to comply to laws, and those that suggest
> otherwise are grossly misrepresenting us, either intentionally or
> unintentionally and in reality isn't what's happening for the majority
> of people using the spectrum as it was originally intended... For
> community mesh use...
>
> It's fact that among our ranks we bolster many professionals in this
> field, this includes radio technicians with many years of experience...
>
> EIRP is rated as being the complete system, from the output of the
> radio and any amps minus and losses and the gain of the antenna...
> generally you don't need an antenna, and 9 times out of 10 if your
> unsure of what your doing you could well be going over the legal limit
> without even knowing it... As the saying goes if in doubt ask...
>
> ***PLEASE PLEASE PLEASE*** make sure your using the spectrum legally,
> this means, channels 1 to 9 are allowed 4W or 36dBm EIRP and channels
> 10 to 13 are ***ONLY*** allowed 200mW or 23dBm EIRP.
>
> Also it is only legal in Australia to transmit on channels 1 to 13, so
> even if you can set your device to channel 14, please don't for the
> sake of the community, and your own legal standing...
>
> Below is the technical explanation with links to the ACA website with
> the current regulations of use with class based licenses...
>
> It's a repost from the tech list a little while back...
>
> ----
>
> 2400 to 2463Mhz is listed as max EIRP of 4W
> 2463 to 2483Mhz is listed as max EIRP of 200mW
>
> http://www.aca.gov.au/publications/info/spreadsp.htm
>
> about 1/2 way down the page...
>
> channel 1 = 2411Mhz centre freq.
> channel 2 = 2416Mhz centre freq.
> channel 3 = 2421Mhz centre freq.
> channel 4 = 2426Mhz centre freq.
> channel 5 = 2431Mhz centre freq.
> channel 6 = 2436Mhz centre freq.
> channel 7 = 2441Mhz centre freq.
> channel 8 = 2446Mhz centre freq.
> channel 9 = 2451Mhz centre freq.
> channel 10 = 2456Mhz centre freq.
> channel 11 = 2461Mhz centre freq.
> channel 12 = 2466Mhz centre freq.
> channel 13 = 2471Mhz centre freq.
> channel 14 = 2484Mhz centre freq.
>
> each channel needs 11Mhz either side of centre freq.
>
> This means channel 10 and every subsequent channel falls into the 2463
> to 2483Mhz range and is only allowed a maximum of 200mW or 23dBm EIRP...
>
> --
> Best regards,
>  evilbunny                          mailto:evilbunny at sydneywireless.com
>
> http://www.SydneyWireless.com - Exercise your communications
> freedom to make it do what you never thought possible...
>



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