Travis, That is an insightful realization. I noticed the same thing when recently doing my 11Ghz, 18Ghz, and 24Ghz calculations. In terms of 9s reliabilty, the jump from 2ft-4ft didn't really make that much difference in the Higher Ghz gear. Not nearly as much a difference as with 5.8Ghz and 2.4Ghz. It was much more advantageous to use the next lower down spectrum range to gain the distance. The impact of 2ft to 4ft however has two major negative impacts... Windload, which is 4x worse, and Space preventing multiple antennas fro mcolocating next to each other. Its not jsut a space issue from verticle pole position, but also teh 4ft dishes may stick out further (if drum type) blocking coverage from sectors antennas mounted on tehsame horizontal plane. Just recently FiberTower mounted a 3ft dish and took out 30 degrees of one of my sectors, even though I was mounted 10-15 feet to the side of them, because the tip of the drum blocked part of the view.
Even selecting a 3ft dish is way advantageous over a 4ft, just because of windload and space. You can get two 3ft dished on a 10fttall-3"dia pole, but only get about 1 4 ft. Considering, every foot you go taller on the pole, adds significant increased windload, do to leverage. Not to mention the ease and safety of working with a 2ft compared to a 4ft. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: Travis Johnson To: [EMAIL PROTECTED] ; WISPA General List Sent: Monday, October 08, 2007 12:10 AM Subject: Re: [WISPA] Longest 18ghz link I already have the 18ghz set sitting on the shelf, that would be the only reason to use it. Here's the interesting thing about a link that long: 2ft dishes = 99.9955% uptime (23 minutes per year outage) 4ft dishes = 99.9992% uptime (5 minutes per year outage) I can live with 23 minutes per year if I can use 2ft dishes. Travis Microserv [EMAIL PROTECTED] wrote: 4 foot dishes but i would prefer 11 ghz Bob Sent from my Verizon Wireless BlackBerry -----Original Message----- From: Travis Johnson <[EMAIL PROTECTED]> Date: Sun, 07 Oct 2007 19:56:50 To:[EMAIL PROTECTED], WISPA General List <wireless@wispa.org> Subject: [WISPA] Longest 18ghz link Hi, Does anyone have any information on long 18ghz links? I keep running the path calculations on a link I am considering (28 miles with 2ft dishes) and I come up with 99.99% uptime for my region. I would really like to chat with anyone that has anything around that range and frequency. I'm having a hard time believing those uptime numbers even in my area. 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