Paul W9AC:
For your particular path (12 miles at 2.5 GHz) the freespace (LOS) path
loss would be about 126 dB. I used one of several available online path loss
calculators. You'll have to plug in things like Pout, Gtx, Grx, cable loss at
both ends and minimal RX signal required to find out whether a particular
equipment suite will work. Include a good margin (maybe 15 dB) to allow for
fade through 12 miles of varying atmosphere.
Regarding "altitude diversity," you have to be mindful of Fresnel zone
clearance, especially for the lower of the two TX antennas. As with "path
loss," Google is your friend.
73 de
Gene Smar AD3F
On 10/22/15, Paul Christensen wrote:
Paul,
I am looking into a high power Wi-Fi solution to get our remote site off
DSL. The footprint edge of the Jacksonville-Comcast Xfinity service area is
approximately 10-12 miles away. The idea is to install a wireless site at a
Comcast subscriber location.
Any idea of the maximum expected LOS distance when running these units at
full power? We can get the Wi-Fi antenna at the remote site as high as 140
ft. AGL. Possibly two units would be installed, one at a lower height for
"lightning damage diversity," then switch between the two on the ground.
Paul, W9AC
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of N1BUG
Sent: Thursday, October 22, 2015 6:49 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] LPFM STL
I haven't been following this thread closely, but are we only talking about
going 100 feet? That is nothing for wireless. I have a very stable 5.6 mile
wireless network link that supports 30 Mbps 24x7x365. It uses Ubiquiti
Bullet HP radios and 24 dBi dishes at each end, but I've turned the power
way down because full power gives -47 dBm signals - much more than needed.
Admittedly system cost was around $300.
Newer 2x2 MIMO devices should double the speed.
Paul
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