[chbot] Long distance data link, advice from the guru's please

Jasper Mackenzie jasper.mackenzie at gmail.com
Sat May 10 23:55:16 BST 2014 

Thank you all!
  Two satellite links look like the best option. And yes, they too are sad  
that people cannot go a week without.
Personally I think that per mac address traffic limits are the way to go.
  But tropo scatter looks soo cool! Turns out they have one in Valdeve  
(remember exon...)
http://upload.wikimedia.org/wikipedia/commons/thumb/9/9a/White_Alice_Site%2C_Tropospheric_Antennas_HAER_AK-21-A-2.jpg/754px-White_Alice_Site%2C_Tropospheric_Antennas_HAER_AK-21-A-2.jpg

I will get hold of Mimo this week, maybe they have magic 8)

I dont think this is off topic as we meet at Tait, and a good deal of the  
members who I have met either work at or have worked at Tait, and tait  
are, well, Good at this stuff 8)

Jasper


> Perhaps just buy 2 channels on the satellite link and get 8GB/week?
>
> It is sad that people can't go 1 week without internet.
>
>
>
>
> On Sun, May 11, 2014 at 8:32 AM, Helmut Walle  
> <helmut.walle at gmail.com>wrote:
>
>> Interesting. So for the Dyers Pass Road location that would be a very
>> short distance from the diffracting edge to the other station, but for  
>> the
>> Wairakei Rd one it would be more equal and at a much "straighter" angle.
>> And between you and the edge, and also the edge and the respectively  
>> other
>> station, there would be quite a good open LOS connection.
>>
>> Unfortunately, the Alska case at hand sounds more like "110 km of open
>> sea" and nothing else. I haven't calculated anything, but seeing that
>> Jasper was mentioning 90 m masts, which wouldn't provide LOS (unless  
>> there
>> are hills to mount them on at either end?), this mast height may already
>> take into account diffraction. But would diffraction over 110 km of sea  
>> not
>> be really poor? Wouldn't it be even worse than the same over smooth  
>> land,
>> due to the good conductivity of seawater?
>>
>> We are somewhat OT here - this might be more productive on a radio ham
>> list?
>>
>> Kind regards,
>>
>> Helmut.
>>
>>
>> On 10/05/14 23:00, Richard Jones wrote:
>>
>>> The line of sight rule can be interesting. From my lounge window in
>>> Diamond Harbour I can communicate using a hand held 5W radio with our
>>> Tait DMR base stations at 156MHz on Dyers Pass Road by the green and
>>> 540 Wairakei Road near the airport. I put this down to diffraction on
>>> the sharp edges of the port hills.
>>>
>>> Richard
>>>
>>> On Sat, May 10, 2014 at 10:34 PM, Mark Beckett <m.beckett at amuri.net>
>>> wrote:
>>>
>>>> Yep that right, but he has another thats lower at Halswell (about  
>>>> 300m)
>>>> My Gridpack is on a pole on the roof to clear the 4m hedge, and we can
>>>> get
>>>> 3.5 - 4Mb/sec.
>>>>
>>>>
>>>> I think you'll find that the satellite uplink is probably 128Kb, and  
>>>> the
>>>> down is 256/512kb.
>>>> The problem is that its limited to a total of 4GB/week.
>>>>
>>>> Adding a second modem is not going to help with the total limit.
>>>>
>>>>
>>>> Unlike us in NZ who have poor broadband, my Australia friend complains
>>>> when
>>>> he has to plug his computer in the get faster than his 54MB WiFi ...
>>>> I imagine our American friends are probably similar, and used to fast
>>>> almost
>>>> unlimited internet.
>>>>
>>>> Mark
>>>>
>>>>
>>>>
>>>>
>>>> Helmut Walle wrote:
>>>>
>>>>> If "Gondola" is the restaurant on Mt Cavendish, then that's  
>>>>> equivalent
>>>>> to
>>>>> a 400 m mast...
>>>>>
>>>>> On 10/05/14 21:25, Mark Beckett wrote:
>>>>>
>>>>>> My wifi is 32km link to the Gondala, and uses a gridpack antenna and
>>>>>> licenced 600mW AP unit.
>>>>>>
>>>>>> Even with good antennas at both ends, I doubt you could extend it to
>>>>>> 110km.
>>>>>>
>>>>>>
>>>>>> Problem with most of these is that its "line of sight", so unless  
>>>>>> you
>>>>>> can
>>>>>> put something in-between you're stuck.
>>>>>> Might be easier to move the Mainland, or use carrier pidgeons to
>>>>>> transport the SD cards.
>>>>>>
>>>>>> Mark
>>>>>>
>>>>>>
>>>>>>
>>>>>> Richard Jones wrote:
>>>>>>
>>>>>>> Tait Radio Communications spun off a company called MimoMax that
>>>>>>> specialises in data links: http://mimomax.com/ This kit is  
>>>>>>> completely
>>>>>>> licensable and uses diversity to achieve almost unbelievable  
>>>>>>> bandwidth
>>>>>>> over a narrow band. This kit probably does not achieve 110km, but  
>>>>>>> you
>>>>>>> could ask them.
>>>>>>>
>>>>>>> The best I've managed with Wifi type technology requiring no  
>>>>>>> license
>>>>>>> is about 4km.
>>>>>>>
>>>>>>> I suspect when you discover cheap broadband link that does 110km  
>>>>>>> you
>>>>>>> will be able to give up your day job :-)
>>>>>>>
>>>>>>> Best of luck with the visit.
>>>>>>>
>>>>>>> Richard
>>>>>>>
>>>>>>> On Sat, May 10, 2014 at 9:03 PM, Jasper Mackenzie
>>>>>>> <jasper.mackenzie at gmail.com> wrote:
>>>>>>>
>>>>>>>> Good day fellow ROboticisers,
>>>>>>>>   I have the privilage of flying off to visit my gf's family in
>>>>>>>> Alaska
>>>>>>>> (you
>>>>>>>> know, the cringing Meet The Family awkward silences...), and her  
>>>>>>>> Dad
>>>>>>>> runs a
>>>>>>>> lodge for people to show off their enormous lenses and fancy new
>>>>>>>> gigapixel
>>>>>>>> cameras and glut out on Bears and stuff etc.
>>>>>>>>
>>>>>>>> Anyway, he has bandwidth issues, all these fancy photographers  
>>>>>>>> want
>>>>>>>> to
>>>>>>>> upload photos etc etc and he has one sattelite link limited to 4gb
>>>>>>>> per
>>>>>>>> week.
>>>>>>>> So I was thinking that maybe they could do a VHF (or similar)  
>>>>>>>> link to
>>>>>>>> the
>>>>>>>> mainland which is 110km away across the sea. I have found a  
>>>>>>>> russian
>>>>>>>> company
>>>>>>>> that had an interesting solution, but all seemed to need towers  
>>>>>>>> ~90m
>>>>>>>> tall
>>>>>>>> which would be a massive hazard as small planes are what these
>>>>>>>> outlanders
>>>>>>>> use to get around.
>>>>>>>>
>>>>>>>> Is there a solution? A data link with usable bandwidth for image
>>>>>>>> uploading,
>>>>>>>> VoIP etc. that could work over 110km without a huge tower, that I
>>>>>>>> could
>>>>>>>> get
>>>>>>>> before june 1st? (Lets deal with licensing later 8)
>>>>>>>>
>>>>>>>> Cheers
>>>>>>>>
>>>>>>>> Jasper
>>>>>>>>
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>>>>>
>>>>>
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>>>>>  _______________________________________________
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>>
>> _______________________________________________
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