Hi,
We are in a very dry climate (actually considered a desert climate).
Going 19 miles, we are using 4ft high performance dishes with high power
radios (+22db output) and we have 32db of fade margin. This link has
never been down in 3+ years.
Travis
Microserv
paul hendry wrote:
Hi Travis,
Just looking to venture into the world of 18GHz. We are looking at our
first link to be about 17.5 miles and I'm wondering if you could give us
more details on your 19 mile link (heights, dish size/db, throughput
speeds, fade margin, etc.)
Many thanks,
Paul.
-----Original Message-----
From: Travis Johnson <[EMAIL PROTECTED]> [mailto:[EMAIL PROTECTED]
Sent: 06 March 2007 05:00
To: isp-wireless@isp-wireless.com; WISPA General List
Subject: [WISPA] 18ghz links
Hi,
We have had several 18ghz links up and running for almost 4 years. Using
many of the path calc programs, they show as much as 28 minutes per year
of outage (due to multi-path and rain fade). Yet, during the entire last
4 years, we have never seen the signal change by more than 3-4db. We
have over 30db of fade margin on these links... so, my question is, does
18ghz just die instantly (like 38ghz does) in a heavy rain storm? We
have never had either of our 18ghz links go down (one is 7 miles and the
other is 19 miles).
I am wanting to try and do a 28 mile link, and I can do it with 20db of
fade margin... so I am wondering if that will be enough, or if the path
calcs will be correct and we will have as much as 20 hours of downtime
per year? (99.7653% uptime).
Any thoughts?
Travis
Microserv
--
WISPA Wireless List: wireless@wispa.org
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
