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

Sat May 10 23:44:44 BST 2014

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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