[MLB-WIRELESS] World Wifi record

Peter Berrett vk3pb at optusnet.com.au
Sat Dec 31 12:50:30 EST 2011

I have just done the path loss calculations assuming

- 17 dbm transmission power (50 mw)
- 20 db gain transmission antenna
- 20 db gain receiving antenna
- 3 db loss in cables
- 2400 Mhz frequency
- 127 km distance

I calculate a received signal after antenna gain of about -88 dbm which is a bit low for my liking.

We probably would need to look into higher gain antennas.

Mind you I have assumed that each of our antennas has 20db gain. I don't know what the gain figure would be for a 90cm offset dish at 2400 mhz? Higher maybe? 

It is possible that your 2.4m dish has a higher gain figure than 20db which would help give some margin.

cheers Peter

  ----- Original Message ----- 
  From: Peter Berrett 
  To: David Nuttall ; MW Wireless 
  Sent: Saturday, December 31, 2011 12:35 PM
  Subject: Re: [MLB-WIRELESS] World Wifi record

  Dear Dave

  I have a 90cm offset dish that I could tack my cantenna onto and I live right by Mt Dandenong.

  I am off work until 10th January. Want to try for the record? You would head out to Ballarat and I'd park myself up at Skyhigh.

  The only issue is what dongle or router should I use at my end?  

  cheers Peter

    ----- Original Message ----- 
    From: David Nuttall 
    To: MW Wireless 
    Sent: Wednesday, December 28, 2011 1:18 PM
    Subject: Re: [MLB-WIRELESS] World Wifi record

    Hi Peter,

    How about we start out with the Australian WiFi record?  I believe the W.A. guys established a fairly long link out to Rottnest Island some time back.  However, I know of no longer link than Peter Buncle's hop from Kallista to the original Highton location at around 100 Km's.

    A Picnic/BBQ trip to Mt Buninyong would give us a path of 127 Km back to node GHO at Mt Dandenong.

    I donated a 2.4 m domestic sat dish and Rob B built up a 2.4 GHz feed and tripod for the dish.  They are still sitting in my shed ready for such a project.



    On 27/12/2011 10:30 PM, Peter Berrett wrote: 

      Hi all

      Would anyone out there be interested in attempting the world unamplified 2.4 ghz wifi record?

      The record I think is held by some Venezuelans (some Italians hold the 5.7 Ghz record).

      The strategy would be as follows

      1. Use an established MW node such as GHO North as one end of the link.

      2. Go about 400 km+ in the direction the node antenna is pointing and erect a node and directional antenna, perhaps solar powered, with a small computer and high gain antenna pointing at the MW node. Perhaps our friends at the Adelaide wireless group could set up a node in their group pointing at us?  

      3. Monitor 2.4 ghz beacons and when there is some tropospheric ducting try the link. Or better still just automate things so that when the station is heard it automatically tries to transfer a video from one end of the link to the other.

      Successful transfer of video = world record


      Peter VK3PB



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