Fwd: Re[6]: [MLB-WIRELESS] New submission up at Inquiry

evilbunny evilbunny at sydneywireless.com
Thu Jun 20 21:49:41 EST 2002 

-- 
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... 

This is a forwarded message
From: evilbunny <evilbunny at sydneywireless.com>
To: "Ben Anderson" <a_neb at optushome.com.au>
Date: Thursday, June 20, 2002, 9:46:05 PM
Subject: [MLB-WIRELESS] New submission up at Inquiry

===8<==============Original message text===============
Hello Ben,

erm no... as i pointed out that wasn't the weakest end...

cabletron card = 15dBm + 12dBi + 3 or 4dBm loss in cable for a sum
total of 24dBm or... about 250mW... the other end also had 10m of LMR
on it... I couldn't be bothered doing the full sums, Perth on the
other hand the 30km was with 180 and a 360 deg wave guide and 30mW
devices both ends, both ends were about 1/2W, the reason the cisco had
more output was due to the substantial output from Sydney airport...

-- 
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, 6:05:24 PM, you wrote:


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

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

BA> 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
BA> power?
>>
>> BA> What equipment did you use to do 10km, what frequency and how much
BA> 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
BA> 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
BA> I
>> BA> haven't been very active in the whole wireless thing -- my numbers
BA> pointed
>> BA> that ubiquitousness was going to be non-trivial with the current
BA> 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
BA> 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
BA> microwave
>> >> BA> communication devices. We see no point in excessive outputs, and
BA> 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
BA> 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,
BA> 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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