Hi All,
I just completely rebuilt a tower site. It had inconsistent speeds and I'd
hit the point that I normally change things around.
When I hit 50 people to a tower I'll sectorize it.
On this tower I had an omni at about 25' (the hill is 700 feet over the
valley) and a 15dB integrated Tranzeo ap at about 15'.
Omni was vertical, sector was horizontal.
I rented a manlift and put an hpol maxrad wisp series 120* adjustable beam
sector at about 45', a vertical at 37ish and another horizontal at about 30.
All antennas are also 6 to 8' horizontally separated. Each on a standoff
attached to the different legs of the tower.
All antennas are fed with lmr600 and the radios are right beside each other
at the base of the tower (I'm too chicken to climb so the radios stay where
I can get to them).
Here's my problem, with all of the radios on and transmitting the speeds are
worse than before for most customers.
The sector to the west has 2 customers and sits at the 30' level and is
hpol. Those two customers get around 4 megs down and up.
The sector to the north east is vertical and a customer at 10ish miles gets
.7 to 1.5 megs down and .25 to .5 up.
The sector to the south east is hpol and sits at the 45 or 50' level.
Customers get .6 to 1.5 down and .1 to .5 up.
Unplug any two radios and speeds hit the 2 to 3 meg, sometimes 4 meg speed
for all customers on that system. Plug the other one back in and speeds
drop back down.
The hpol maxrad antennas have a 30dB fb ratio. I've not yet looked at the
patterns lately, as I recall they are pretty good though. APs are
Teletronics 11-152s with metal cases.
I've had GREAT luck with ALL of these components at other sites. Just never
all at the same time and place like this. As most of you know, most of my
coverage areas are VERY low density so I tend to use a lot of omni antennas,
or am mounted on hills that have no coverage behind them so only one or two
sectors are used.
The two systems that interfere with each other the most are north east and
south east. One's hpol one's vpol. They are on channel 1 and 9.
To get things working MUCH better than they were before, I've replaced the
north east and south east radios with Tranzeo ap's. I also moved the
southeast antenna (actually put up a new one) back down to the roof of the
shack. It's also a Tranzeo ap now. It, however, now sits in front of,
though much lower than the west antenna, both are hpol though. If the
channels are anywhere near the same for west and southeast the folks to the
west get really slow speeds.
I also moved the antennas on the tower further apart, they are now at least
5 or 6 feet apart from each other. I don't know how much that helped as I
changed one of the radios to a Tranzeo at that same time. This helped but
didn't fix the speed and consistency problem. That's when I moved the south
east system back down where I could more easily get to it.
Things still aren't as consistent as they need to be. If one system gets
busy the others slow down. Any ideas? My first thought is to try a REALLY
high end access point or two. You'd think those systems could sit side
beside when using channels so far apart from each other. It's like the new
radios are soooooo sensitive that they will pick up the noise close to them
no matter what. OR, more likely, that the new, cheaper, gear has really
really sensitive radios but with rotten side band isolation on both tx and
rx.
Any ideas? Radios/antennas to try? Changing the radios is easy. Getting a
manlift back out to change the antennas will suck big time (due to the stand
offs it would be too hard/dangerous to change antennas from the tower).
thanks,
marlon
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