Re: Wireless ISP in Nicaragua

yah im also looking for online formula in solving equations like that.
im using 200mw cpe at both ends and was able to shoot over 5km range.

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On 7/16/05, Dave & Liz Cabot <[email protected]> wrote:
> No, actually I'm dyslexic.  -72dbm.  Sorry.
> 
> All I know is what the software is telling me on the client side.  I am
> using a directional antenna on the client side, but not parabolic.  The
> software on the CPE is where I'm getting my numbers.
> 
> So, let me understand then.  I realize that the percentage number is just
> some relative thing.  I shouldn't be getting 100% when I go from a 200mw to
> a 2 watt setup.
> 
> And then you've introduced something to me that I didn't realize was a
> problem.  I can overpower the radios?  I'll have to look up those terms,
> because I'm not familiar with then.
> 
> I guess one problem is that I'm trying to create a single solution.  I'm
> trying to cover an area that is some 20-30 miles wide - three small cities.
> Bad way to do it?
> 
> BTW, where can I get the formulas that you used to determine what signal
> strenghts I should get with varying antennas, wattage, and distance?
> 
> Thanks for the input!
> Dave
> 
> -----Original Message-----
> From: Casey Halverson [mailto:[email protected]]
> Sent: Friday, July 15, 2005 1:11 PM
> To: SeattleWireless Talk List
> Subject: RE: Wireless ISP in Nicaragua
> 
> -27dBm???  Are you sure??  You'd need a 47dBi antenna for that kind of
> signal.
> 
> If you put 100mW to a 14dBi antenna, stand 1.55 miles away (2.4km) and hold
> a 24dBi parabolic in the other direction, you could only manage to get
> -50dBm.
> 
> A 2 watt radio into a 14dBi antenna, standing 1.55 miles away, and holding a
> 24dBi parabolic in the other direction will give you -37dBm...which is way
> too much signal and will overpower many radios (including the orinoco).
> 
> I think you got your testing mixed up.  ;)
> 
> Anyway, I would not suggest using 2 watts to shoot 2.4km.  That is way too
> much power, and it will do more harm than good in forms of multipath, radio
> overload, band splatter, etc.
> 
> 
> 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of Dave & Liz
> > Cabot
> > Sent: Friday, July 15, 2005 11:09 AM
> > To: [email protected]
> > Subject: Wireless ISP in Nicaragua
> >
> > Sorry to butt in.  Just desperate for some help.  If you can point me
> > in the right direction, then I'll be on my way.
> >
> > I've got an AP setup and I'm having a little trouble.  I'm trying to
> > move from a 200mw radio to a 100mw w/ a 2 watt amp (illegal in the
> > US), but I'm not getting the expected results.
> >
> > What I've got is an Orinoco AP2000 with an Orinoco Classic Gold PC
> > card (100mw).  When I connect it to my 14 dbi sector antenna directly,
> > I get about 22-25% (-27db signal, -95db
> > noise) signal from about 2.5 km away.
> > When I put the 2 watt amp in between, I only get 47% (-47db signal,
> > -95db
> > noise) from the same location.  I'm expecting a lot better.
> >
> > In this configuration I've got the radio and antenna next to each
> > other, so there's very little cable.  I do plan on using 50' of
> > LMR400, but at this time that's not the problem.
> >
> > Any suggestions?
> >
> > Dave & Liz Cabot
> > VoIP voice USA +1 (727) 490-3579 **
> > House +505 341-3488
> > Cell +505 841-1013
> > ** when network is available.  If you get voice mail and it's urgent,
> > you may want to try my cell number.
> >
> > _______________________________________________
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> >
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