[MLB-WIRELESS] New world record for wifi link (125 Miles).

[Ratbaggy]

* Isotropic to Isotropic path loss at 2.45 GHz over 200 km is about 146 dB.
* 3 m dish at this frequency should give about 40 dB gain,
* Allow 2 dB feeder loss at each end
* 146 - 80 + 4 = 70 dB Path loss!
* TX power 100 mW = +20 dBm  (and an EIRP of +58 dBm oooops!!!!!)
* => RX level = 20 - 70 = -50 dBm  (and we probably only need -80 dBm)

Which gives a fade margin of 30 dB (HEAPS!!!!!)

Problems:-

* Finding a 200+ km path that vaguely has 1st Fresnel zone clearance.  Earth
bulge becomes significant over these distances.  Suggestions anyone?????
* Legales - EIRP +36 dBm. Although as long as we have a licensed radio
amateur at each end I think we should be OK.

I'M UP FOR IT!!!!!!!!!

Ratbaggy.







----- Original Message ----- 
From: "Horace Pinker" <horacepinker at hotmail.com>
To: <melbwireless at wireless.org.au>
Sent: Tuesday, August 02, 2005 8:55 PM
Subject: RE: [MLB-WIRELESS] New world record for wifi link (125 Miles).


> well i got a 2.8 metre dish siting around just beging to be used on
> somethiing like this :)
>
> >From: "Adrian Lodders" <adrianlodders at bigpond.com>
> >To: <melbwireless at wireless.org.au>
> >Subject: [MLB-WIRELESS] New world record for wifi  link (125 Miles).
> >Date: Tue, 2 Aug 2005 16:38:42 +1000
> >
> >http://www.wifi-toys.com/wi-fi.php?a=articles&id=91
> >
> >Anyone thing we could beat it? ;)
> >
> >
> >- Adrian
> >   NodeGZX
> >
> >
> >To unsubscribe: send mail to majordomo at wireless.org.au
> >with "unsubscribe melbwireless" in the body of the message
> >
>
>
>
> To unsubscribe: send mail to majordomo at wireless.org.au
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