[MLB-WIRELESS] New submission up at Inquiry

[Ben Anderson]

that's a 100mw card with (cant find base2 log calculator grr) about 3W EIRP
with a 14db antenna...

That's 6 times more power than the claimed 0.5W EIRP doing 30km!!

Ben.


> Hello Ben,
>
> We had a Waveguide made up and shipped over from Perth, Approx. 14dBi,
> though others dispute this claim, that's regardless... Connected to a
> Cisco AP running at 20dBm, this wasn't the weakest end...
>
> Other end had a cabletron card hooked up to a cantenna and 10m of
> LMR400, estimated gain of cantenna about 12dBi...
>
> the distance was actually 9.3km measured by GPS with about 7m of
> accuracy etc...
>
> We managed according to the device 11Mbits... trick is to not waste
> money on cheap gear... found that out the hard way...
>
> --
> 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...
>
> Thursday, June 20, 2002, 5:22:24 PM, you wrote:
>
>
> BA> Hmm, can you explain which numbers are what?
>
> BA> And your 1/2W at both ends, is that 1/2W EIRP, or 1/2W transmitter
power?
>
> BA> What equipment did you use to do 10km, what frequency and how much
bandwidth
> BA> did you manage to squash through the link?
>
> BA> I'm fascinated by this because I did the maths ages ago, and actually
played
> BA> with some of the cards and the performance agreed with my numbers
> BA> significantly better than it agreed with yours...  One of the reasons
I
> BA> haven't been very active in the whole wireless thing -- my numbers
pointed
> BA> that ubiquitousness was going to be non-trivial with the current
generation
> BA> of hardware...
>
> BA> Ben.
>
> >>
> >> Quick math lesson...
> >>
> >> 15dBm - 2dBm + 13dBi + 14dBi - 2dBm = 38dBm
> >>
> >> free space loss over 30km = 130dBm
> >>
> >> 38 - 130dBm = -91dBm... ie still able to get a connection on cisco and
> >> lucent based gear... and guys in WA have made claims of such... I
> >> personally have done 10km on less then 1/2W at both ends... any
> >> further I would need a boat...
> >>
> >> --
> >> 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...
> >>
> >> Thursday, June 20, 2002, 6:08:14 AM, you wrote:
> >>
> >>
> >> BA> Page 11 of the submission it states:
> >>
> >> BA> "One potential abuse is in the form of excessive output from
microwave
> >> BA> communication devices. We see no point in excessive outputs, and
will
> BA> highly
> >> BA> encourage others to follow suit, as we have had 10km to 30km links
> BA> using
> >> BA> only
> >> BA> one-eighth the output allowed by law."
> >>
> >> BA> Now let's do some quick math...  an eighth of legal would be
0.5watts
> BA> EIRP.
> >> BA> Presuming we're using a 30mw card, we could then use a 12db gain
> BA> antenna
> >> BA> which would give us 480mw EIRP (i.e. just around the claimed
> BA> 'eighth').
> >> BA> 30mw and a 12db antenna!  And 10km to 30km links? Using this much
> BA> power?
> >> BA> Who's got the crack-pipe, and can I have some?
> >>
> >> BA> Ben.
> >>
> >>
> >>
> >> BA> ----- Original Message -----
> >> BA> From: "Clae" <clae at tpg.com.au>
> >> BA> To: <melbwireless at wireless.org.au>
> >> BA> Sent: Thursday, June 20, 2002 4:56 AM
> >> BA> Subject: [MLB-WIRELESS] New submission up at Inquiry
> >>
> >>
> >> >> The national joint individual submission to the wireless inquiry,
> >> >> which was worked on by myself, Dwayne, evilbunny and many others,
has
> >> >> now been made publicly available at the Inquiry website
> >> >> http://www.aph.gov.au/house/committee/cita/Wbt/subslist.htm
> >> >>
> >> >> under "Users of Wireless Technologies"
> >> >>
> >> >> There's a few other new ones there too.
> >> >>
> >> >> --
> >> >> David Clae Gason
> >> >> Secretary, Melbourne Wireless
> >> >> mailto:secretary at wireless.org.au
> >> >> http://wireless.org.au
> >> >>
> >> >> i hate anarchists. i think there should be a law against them  -tahl
> >> >>
> >> >> To unsubscribe: send mail to majordomo at wireless.org.au
> >> >> with "unsubscribe melbwireless" in the body of the message
> >> >>
> >> >>
> >>
> >>
> >>
> >> BA> To unsubscribe: send mail to majordomo at wireless.org.au
> >> BA> with "unsubscribe melbwireless" in the body of the message
> >>
> >>
> >> To unsubscribe: send mail to majordomo at wireless.org.au
> >> with "unsubscribe melbwireless" in the body of the message
> >>
> >>
>
>



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