RE: [Sheflug] wireless engineery types

["Chris Johnson" <chris [at] xxxxxxxxxxxxx>]

> I have 2 questions also
>
> what type of wifi router did you buy ?  there are different types,
> with different connectors.

I got a USR 9106 as it was a good price with built in router, adsl modem,
firewall and 4 port switch, and a free PCMCIA card too.

>
> Have you tried using kismet to measure the strength ?
>
Only took it out of the box just this morning so not connected it yet at
all.

>
> You don't want to use ordinary coax, as its no good for the 2.4ghz
> and will not perform well
>
I'd thought that would be the case.

> LMR400 is the cable of choice, but its around £2+ per metre.
> Its loss is about 0.2db per meter
>
> Then you need a pigtail
> ( its a small cable that will convert the AP aeriel connection to
> standard N-Type for other aeriels )
>
I was thinking the shopping list might starty to get long....

> Legal limits on power output are 100 mW == 20dbm
> (from man iwconfig dbm = 30 + log10(watts) )
>
> you can easily get 10 db gain from an external aeriel and
> many access points
>
> are at about 15db out of the box
>
> so 15dbm + 10 db gain = 25 dbm output.
> So you'd want 25m LMR400 to put you to legal limits again
> ( you might lose a couple of db in lightning  arrestors and   pigtails
> though )
>
> A good place for custom cable is
>
> http://www.msdist.co.uk
>
> a cheap place for aeriels is http:www.solwise.co.uk though I
> have found
> their
> cable to be variable in quality.
>
> Maplins don't stock the parts in my experience. the RF
> connectors are quite
> specialised


I didn't think they would.

I'll test it to see what range/coverage its got and then see if I need any
more hints and tips.

Thanks

ChrisJ

>
>
>
> Alan Dawson
> --
> ICT Services
>
>
> ___________________________________________________________________
>
> Sheffield Linux User's Group -
> http://www.sheflug.co.uk/mailfaq.html
>
>   GNU the choice of a complete generation.
> ---
> Incoming mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.773 / Virus Database: 520 - Release Date: 05/10/2004
>

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.773 / Virus Database: 520 - Release Date: 05/10/2004


___________________________________________________________________

Sheffield Linux User's Group -
http://www.sheflug.co.uk/mailfaq.html

  GNU the choice of a complete generation.