The dual-polarity sectors have a pretty narrow vertical beam width.
We've found it useful to select the subs at the edges of the sector, and
adjust the vertical/horizontal on the AP until we get optimum results.
bp
<part15sbs{at}gmail{dot}com>
On 10/6/2015 1:10 PM, Matt wrote:
This CPE has all new cable, new KP dish and aligned when the 450 went
in. I was told that the top 75 percent of 300 foot tower is visible
from dish mount as well. Sectors mounted near the top of tower and no
shadows either. The signal seems to be about this or bit worse
whenever I check actually.
I wanted to overlay a number of sites like this so quite frustrating.
Not going to go well if I only have 22mbps downstream to share at 6
miles. Wandering if these old ap's are bit flaky.
I will likely go back up and check sectors aiming etc again but
everything looked good last time. Was thinking of purchasing another
new 450 lite AP to try swapping it out.
Well, you're losing about 10 dB somewhere. You should be losing less than 3
dB at 30 degrees since it's a 65 degree sector at the 3 dB points.
If you are reusing dishes, what kind of dish? Are these Cambium/KPP dishes?
Did you tweak up the alignment after replacing the 2.4 SM? Any chance the
sector downtilt is off?
Are you graphing the signal? Does it stay steady, or vary throughout the
day like maybe you have some multipath?
The numbers I quoted are based on actual deployment, although they line up
with path calcs. So you should be able to achieve them.
-----Original Message----- From: Matt
Sent: Tuesday, October 06, 2015 2:35 PM
To: [email protected]
Subject: Re: [AFMUG] Cambium PMP 450 5GHZ Cluster
I would expect -67 to -70 under the following assumptions:
- operating in 5.7 GHz
- 19 dBm xmt power on AP
- measuring rcv signal at SM (higher at AP because SM can exceed +36 EIRP
xmt)
- straight down the middle of the sector
- downtilt properly adjusted on sector
- no multipath or rain fading
At the edge of a sector (+/- 45 degrees azimuth) expect to lose 5-6 dB.
Your assumptions are pretty well right on my system setup. Except I
am about 30 degrees from center of sector on this SM. This is my link
status. AP -76.0 (-79.6 V / -78.5 H) SM -80.5 (-83.0 V / -84.0 H)
with 22mbps downlink test.
Expected more. The cambium 90 sector antennas are new but AP's are
pretty old pulls from a deployment that never panned out. Think they
are back from when PMP450 line first started shipping.
This site has a PMP100 2.4 cluster running out of capacity. Was
hopping to overlay with 5.8 450 and just drop the SM's in existing
reflectors of higher tier users that had LOS.
I just deployed 4 90 degree Cambium 450 sectors on a 300 foot tower.
I have a very clear LOS CPE at 6 miles with a reflector dish. What
kind of signal should I have at this range?
