Those link distances seem quite long for 11GHZ using 2 foot dishes.
Have you had any vendors you are looking at run some path calculations
for you? The nice thing about Licensed links is the path calculations can
give you your estimated downtime over a year period. We are working on an
11GHZ link for a client. Basically us working is getting the GPS
coordinates, tower heights, and then contacting the vendors on the short
list. They run the path calculations and tell us if it will work or not.
This particular path is looking at 18 miles with 4 foot dishes to keep the
reliability high.
Justin
--
Justin Wilson <j...@mtin.net>
http://www.mtin.net/blog
Wisp Consulting Tower Climbing Network Support
From: Scott Carullo <sc...@brevardwireless.com>
Reply-To: <sc...@brevardwireless.com>, WISPA General List
<wireless@wispa.org>
Date: Thu, 22 Apr 2010 22:39:24 -0400
To: <wireless@wispa.org>
Subject: [WISPA] Couple more questions for the 11Ghz folks
Spending over 10K for a link (or anything for that matter) causes me to do
a bit more homework than usual when I'm dealing with something I am not
familiar with.... So more questions... Thanks ahead for your time I
appreciate any info provided.
Looking for generic 11Ghz answers - not related specifically to any
manufacturer.
Two links in question, one 20 miles and one 30 miles. 18db output 40.4 db
dish (4ft) 900ft tower to 300ft tower both instances 900ft tower in middle
with one link east one west. Calculations show just under 700 watts EIRP
How much is the rain going to affect me... I have no experience with 11Ghz
and would really like a firm grasp on what happens to my link(s) when the
rain starts. I understand the Trango Apex which I'm looking at can
dynamically adjust speeds to account for some fade - exactly how much I'm
not sure. Any real world info would really help me at this point. I guess
I'm looking for good news :) but I need to hear the bad as well if it is
reality.
Next question is for temp inversions. I have never had equipment higher
than about 350ft so the 900ft is a bit new for me. I'm assuming that the
angle different from going from 300ft to 300ft vs. 900ft to 300ft would be
a small portion of a degree difference so I'm not expecting anything
different here. Confirm this really won't make a difference for me as I
suspect... I'm not going over much water, just St. Johns river mostly
marsh but it does cause differences in temp above the water. Does 11Ghz
behave the same as 5Ghz for inversions? Worse, better? 5Ghz around here
sways a lot actually if you look at RSSI graphs.
Anything else I might want to know, understand, be warned about etc?
Remember back to your first 10K + link :) That's me now...
Scott Carullo
Brevard Wireless
321-205-1100 x102
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