Depends on what rain zone he’s in,
but I agree that a 1.5 mile and certainly a .5 mile 38GHz shot should be a walk
in the park. I expect alignment is the issue and he’s probably
lined up on a side lobe.
We spend an inordinate amount of time
aligning our 38GHz links. We also use very heavy mounts sometimes as
large as 4” ID. Can’t afford to have this stuff move.
<grin>
Best,
Brad
-----Original
Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
Of Travis Johnson
Sent: Thursday, September 21, 2006
3:09 PM
To: WISPA General List
Subject: Re: [WISPA] PTP Link
Recommendations
David,
What are your signal levels on each side (the actual RSSI using the management
program)?
Even at 1.5 miles, with 2ft dishes I show you should have a -26db RSSI and
total downtime during a 1 year period of 7 minutes. (99.99999% uptime).
Travis
Microserv
David E. Smith wrote:
Travis Johnson wrote:
P-com 38ghz with DS3 to ethernet converters. 1ms ping times, 45Mbps full-duplex
(90Mbps total). Total equipment cost less than $3,000. Check on ebay.
As long as it doesn't rain. :)
Seriously, I've got two pair of these, and while they're rock-solid most
of the time, I do have a few issues with rain fade. Normal drizzle and
light rain aren't a problem, but torrential pouring-down-buckets Katrina
flashback rain will make the link drop for a few minutes. (The two links
I have are about 1/2 mile and 1 1/2 miles, and the longer one is a bit
more susceptible to rain fade. They're both running near or at the
maximum legal transmit power, and have the highest-gain antennas I could
find for that gear.)
Also, to stay nice and legal, don't forget to factor in the license
costs. (38GHz is licensed spectrum, but you can lease a license for $500
per link per year. Not a big cost, but something to keep in mind.)
David Smith
MVN.net
