Look at your link calc. Calculated output EIRP was at 41. I ran a 7.7
mile link calc in one of our AF5's with the max output power set to
30dBm, and it says a 40MHz channel @ 30dBm will get around 4x
modulation, 16QAM, 204Mbps with a -77. That's probably a bit optimistic,
but it also looks like you may have a noise problem somewhere. Also
doesn't give you any fade margin.
If you ran the same link on a pair of 40mhz channels, you would still
have around a -77, but with 30dBm EIRP you'd see close to 200/200Mbps at
a -77-ish.
If you ran this link on 57xx/58xx, you could run ~ 45dBm, 8x mod,
256QAM, 200/200 with a -62 on a pair of 20mhz channels.
A pair of 40's would give you 8x mod, 256QAM, 409/409Mbps, -62. A pair
of -50's would give you 512/512Mbps, -62.
Josh Reynolds, Chief Information Officer
SPITwSPOTS, www.spitwspots.com <http://www.spitwspots.com>
On 10/21/2014 12:25 PM, Stephen Parac wrote:
I'm having some issues with my first AirFiber5 link. I've successfully
installed an AirFiber24 link. I've used the link calculator and the
anticipated signal is -66 on both sides.
Background: There are zero obstacles in the way of the link. One is
installed on the edge of a cliff, the other on the outermost edge of a
water tower 140' in the air. I've also confirmed there is little to no
noise operating on both frequencies. We've also verified the mounts
are perfectly level and plumb. We've also spent a significant amount
of time peaking the antennas and are 95% confident (we're going back
out at the end of this week) that the screenshots are as good as they
are going to get. I've also "bench" tested them and was able to adjust
the output power setting to get the desired RSSI, where I got the
desired throughput.
Given all of that, does anyone have any suggestion? I can't imagine
the issue is anything but for alignment, but we've spent a lot of time
on alignment and its hard to believe that's still the issue given how
much time we've spent out there. I've installed licensed links before
and we have a ton of experience, we know about side lobes and how to
properly peak equipment.
On a side note, its hard to keep the link status as "operational" and
the remote sides of both links frequently drop and come immediately
back. I also can't seem to get the output power to match what I have
it manually set to. Finally, I have slowed the modulation rate down to
try and assist with peaking.
Any advice is appreciated.
--
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