Are you shooting at horizontal or vertical polarity if its vertical that killed your signal GARUNTEED, also what's the distance of the islands from one another are we talking 10-15 miles or like 20-30 or whats the case? I mean I know people have done it to 20 and been successful on horizontal but really this is pushing it I would believe so My #1 suggestion is make sure both sides are on horizontal polarity without any 2.4ghz equipment too close to cause interference at either en That's another reason people use 100' or 200' towers to get away from as much interference at the source as possible.
Chris
PS. I love sb forums for that same reason as well quick responses and friendly people except eje he doesn't like me much :P Just playin with ya eje ;)
-----Original Message-----
From: John Hokenson [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 11, 2003 7:40 PM
To: [EMAIL PROTECTED]
And how high are the sea walls you are attached to?
JH
----- Original Message -----
From: "Oliver Leamy" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, June 11, 2003 3:58 PM
Subject: RE: [smartBridges] Height of Mast?
> Hi,
>
> Thanks for the replies. One thing I like about this Smartbridges e-mail
> group is that when you ask a question you get answers!!
>
> You mentioned that the antenna I was using was an overkill, yet I was
> only getting about 20%-40% signal strength on the SB air monitor program
> and very poor throughput. When I used a 19dbi panel, I couldn't get any
> connection at all !!!!
>
> I asked a related question today where I outlined the type of testing I
> was doing. It was a temporary test so one link was at ground level and
> maybe that is why it didn't work too well. I had a look at YDI and it
> calculated a fresnel radius of about 45 feet. From that would I be
> right in assuming that, for best results, each antenna should be at
> least 45 feet above sea level.
>
> Oliver Leamy
>
> Ogenek Teoranta, Ballingeary, Macroom County Cork
> +353 (26) 47808 ; +353 (86) 8337664
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf Of
> [EMAIL PROTECTED]
> Sent: 11 June 2003 23:26
> To: [EMAIL PROTECTED]
> Subject: Re: [smartBridges] Height of Mast?
>
> fresnel incursion over water? (I'm assuming he's shooting over water
> since
> he's linking islands).
>
> I'd think it'd be more likely to be multipath from reflections off the
> water.
>
> Try shooting horizontal instead of vertical. And did you say the islands
> are only a few miles apart? If so, the 20dB is overkill. Use something
> smaller or throttle the power back. (this will help minimize multipath
> .or so I've read on the Internet ...and you can't trust the Internet ;)
>
> TIM
>
> ---------- Original Message ----------------------------------
> From: "John Hokenson" <[EMAIL PROTECTED]>
> Reply-To: [EMAIL PROTECTED]
> Date: Wed, 11 Jun 2003 15:30:47 -0700
>
> >You have to be aware of fresnal zone incursion. I suspect that is why
> you are seeing poor performance on your current link. Go to the
> calculators on the YDI site and run the numbers.
> >
> >JH
> > ----- Original Message -----
> > From: Oliver Leamy
> > To: [EMAIL PROTECTED]
> > Sent: Wednesday, June 11, 2003 1:21 PM
> > Subject: [smartBridges] Height of Mast?
> >
> >
> >
> > Hi,
> >
> >
> >
> > I have a need to connect three islands together. Am going to use
> AirPoints and 20.5dbi mesh antennas. On recent email discussions I've
> noticed that most people are using masts and the antennas at 100 or 200
> feet. For our installations, we will have to use residential premises.
> There is a clear view between the locations.
> >
> >
> >
> > Is there a reason why people were using 100' masts and does anyone
> think that I will have problems simply using the rooftops when there is
> no
> obstructions in between.
> >
> >
> >
> > Oliver Leamy
> >
> >
> >
> > Ogenek Teoranta, Ballingeary, Macroom County Cork
> >
> > +353 (26) 47808 ; +353 (86) 8337664
>
>
> Tim Foster
> www.AledoBroadBand.com
> Aledo's only high-speed ISP
>
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