I am using the calculator made by the company that made the radio
(WitCom). They are +22db radios and they show using 2ft dishes a -55
RSSI with a needed -77 to keep the link up. These are not the newer
style, auto modulating radios. They are 45Mbps full-duplex, and either
they are up, or they are down. They don't rate shift or anything like that.
I have two other links using these radios... one is 19 miles with 4ft
dishes and we have never even seen the signal fade by 2db even in the
heaviest rain storms. This is different than our 15 mile Dragonwave
radios that we see 10-15db fades during the same storms.
Travis
Microserv
Brad Belton wrote:
Hey Travis,
What calculator are you using and what is it telling you the expected rssi
will be?
Best,
Brad
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Travis Johnson
Sent: Sunday, October 07, 2007 11:10 PM
To: [EMAIL PROTECTED]; WISPA General List
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 <mailto:[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
Date: Sun, 07 Oct 2007 19:56:50
To:[EMAIL PROTECTED], WISPA General List
<mailto:wireless@wispa.org> <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.
Travis
Microserv
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