[manchesterwireless] Could Warrington Wireless go SuperG?

[G.W. Haywood]

Hi Andy,

On Tue, 3 Jan 2006, Andy Gauton wrote:

> ...Happy New Year.

Same to you, and all!

> Warrington Wireless, hit a problem over the past few weeks.

:(

> a new AP is being picked up ... killing our connection :(

:(

> However, after some clever channel hopping, we seem to be running ok as of
> 58 mins ago :)

:)

> If were were to use SuperG can the other SuperG network in the road co-exist?
> It's causing interference at roof level between ch1-10, so if we were both
> SuperG at Ch6 would it work, or will interference problems greatly increase?

No idea.  Much more information needed.  Did you do any of the things
I suggested in my list of 27 October 2005?

73,
Ged.
----------------------------------------------------------------------

On Thu, 27 Oct 2005, G.W. Haywood wrote:

> On Thu, 27 Oct 2005, Andy Gauton wrote:
>
> > Warrington Wireless celebrated it's 1yr anniversary of success.
>
> :)
>
> > Over a 12 month period ... only a couple of minor issues - solved by
> > router reboot, usually remotely using Telnet :)
>
> Telnet!???!!!  For goodness' sake junk it and use SSH!
>
> > However, just as we were about to celebrate ... the network has been
> > experiencing some major problems ... started noticing serious bandwidth
> > issues ... recently 15k ... 900k, with the occasional 2MB+
>
> > Went round the road with a laptop... VERY STRONG BT Voyager router
> > signal on Ch8 ... Figures to be released once testing has been done
> > over the next few days.
> >
> > Your thoughts please.
>
> It's not just a matter of telling the devices which other devices they
> should listen to, and which they should ignore, is it?  There is still
> a clear line of sight between the antennae?  Nobody put a new extension
> on their bathroom or anything?
>
> Other thoughts:
>
> 1. Set up something to measure your signal strengths continuously.  See
>    for example http://www.jubileegroup.co.uk/radio/powerbudget.html which
>    shows some snow on an antenna, and if you think that the leaves on trees
>    won't matter see http://www.jubileegroup.co.uk/radio/tree_trimmings.gif
>    which shows the result of trimming a cherry tree (twice, on July 24 and
>    August 21).   Also you'll see the effect of the sun shining on the black
>    plastic box which contains the APs atop the mast in our installation -
>    AP manufacturers don't seem to mention temperature coefficients much in
>    their literature...  Incidentally I'd expect you to see better results
>    in cooler parts of the year, other things being as equal as possible.
>    Which they won't be, of course.
> 2. Write down some numbers for all the component parts.  For example "At
>    20 deg. C we have +14dB from AP number 1, its sensitivity is -85dB, the
>    antenna is a 16dB omni, there is about a 10dB loss between the connector
>    on the antenna and the connector on the AP, the free space loss between
>    AP1 and AP2 is -82dB because it's a distance of xxx.x metres."
> 3. Write down some more numbers for signals received from each AP by the
>    other APs - and while you're at it, for signals received from elsewhere.
> 4. Don't imagine that ANY of your numbers will be constant, except maybe
>    for the speed of light in vacuo.
> 4. Given the collection of numbers, decide what you think should happen.
> 5. If it's not happening:
> 6. Check the equipment performance, losses in the cables, connectors etc.
> 7. Try changing the antenna polarization.
> 8. Try using more directional/better antennae (my personal favourite.)
> 9. http://www.zytrax.com/tech/wireless/intro.htm (just found it, looks useful).
>
> Let us know how you get on?
>
> 73,
> Ged.
>
> PS: Fill in the xxx above - that's a little test.
>