I /have /seen similar things on Canopy 900.
1. I work with a lot of 900 APs. Test the radios that are down. Leave
them running connected to the tower as an SM from a couple miles for
a couple days. I bet they are just fine. But testing an AP as an SM
is not a 100% guaranteed test (had one test fine then burn up after
use on the tower as an AP for 90 minutes).
2. My gut says you are looking in the wrong spot. You need to be
monitoring the amps being drawn by the radio. I think it is your
CMM/CTM (assuming you are using one). Switch it to a different port.
If not, swap the power supply.
3. Your radio is running too hot. -45 is not a good thing on 900! Set
the AP to bring everyone down to (say) -65. You could be desensing
the receiver. We have people connecting happily in the -80s.
4. The 2.4 is not the issue. We have some located 0 ft vertically
offset and horizontally within 12" of 900 radios (plural) with them
all on omnis. 4 feet of vertical separation is ample.
On 6/13/2013 11:41 AM, David Hannum wrote:
The S/N's on the radios are not really close. The second two that
went bad came from a different shipment from the first batch. No
visible signs of vandalism. Tower has locked cage around ladder. I
can't imagine vandalism, however, you never rule out anything you can
prove is out.
Dave
On Thu, Jun 13, 2013 at 11:25 AM, Coenraad Loubser
<[email protected] <mailto:[email protected]>> wrote:
Extreme bad luck - or perhaps not - are all the radios perhaps
from a faulty batch? Vandalism - Is there any sort of access
control or surveillance at the site? The first thoughts that
spring to mind.
On Thu, Jun 13, 2013 at 4:40 PM, David Hannum <[email protected]
<mailto:[email protected]>> wrote:
Never tried that before. We always use LPU's on the CAT-5 but
I've never put one on the antenna lead. What kind of line
loss does it cause? I don't see that in the Tech Specs.
Also, does it come with a male antenna connector side?
Dave Hannum
On Thu, Jun 13, 2013 at 10:35 AM, Kurt Fankhauser
<[email protected] <mailto:[email protected]>> wrote:
Can you possibly put a polyphaser on the 9000APC? I use these:
http://www.tessco.com/products/displayProductInfo.do?sku=531462&eventPage=1
Kurt Fankhauser
Wavelinc Communications
P.O. Box 126
Bucyrus, OH 44820
http://www.wavelinc.com
tel. 419-562-6405 <tel:419-562-6405>
fax. 419-617-0110 <tel:419-617-0110>
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of *David
Hannum
*Sent:* Thursday, June 13, 2013 10:11 AM
*To:* WISPA General List
*Subject:* Re: [WISPA] Strange problem with Canopy 9000APC
The first radio went bad on the first antenna. The second
and third radios have gone bad on the second antenna.
We'll probably swap the antenna again this afternoon on
this one.
Dave Hannum
New Era Broadband
On Thu, Jun 13, 2013 at 10:05 AM, Jason Bailey
<[email protected] <mailto:[email protected]>> wrote:
That's why I said antenna. It happened frequently after
changing the antenna.
--- On *Thu, 6/13/13, David Hannum /<[email protected]
<mailto:[email protected]>>/* wrote:
From: David Hannum <[email protected]
<mailto:[email protected]>>
Subject: Re: [WISPA] Strange problem with Canopy 9000APC
To: "WISPA General List" <[email protected]
<mailto:[email protected]>>
Date: Thursday, June 13, 2013, 10:01 AM
Moisture is not an issue. Good drip loops on both the
antenna cable and CAT-5 Cables. We actually sealed the
entry of the radio with mastic to be sure. The first
radio lasted about 10 months. When it went, we first
swapped antennas, thinking maybe a lightning strike
damaged it (we've had the same effect on signal from bad
antenna). That did nothing to help, so we next swapped the
radio. Signal back. That lasted about four weeks. Swapped
radio again, and signal back. Lasted about 12 hours this time.
No visible damage to any of the radios. No moisture found
inside. We don't have capability to test in-house. Will
send to SWG or Wireless Units to have them take a look.
Dave Hannum
New Era Broadband
On Thu, Jun 13, 2013 at 9:46 AM, Fred Goldstein
<[email protected]
<http://mc/[email protected]>> wrote:
On 6/13/2013 7:43 AM, David Hannum wrote:
> We're having an issue with a 9000APC that is very
strange. Here is the
> situation. We have a remote water tank (stand pipe 75'
high) that has a
> few homes around it. So, we have a 9000APC and a
connectorized 2450AP
> on the tower, both on Omni's. The antennas are on a
stand almost
> exactly 4' apart. There are six subs on the 900MHz
radio. About a
> month ago, I had an issue where (after about 9 months)
the signal to all
> of the customers just faded out, to the point that only
two subs were
> still good. I swapped the antenna and that did not
help. I swapped the
> radio, and that fixed the problem. Trouble is, it only
lasted about
> three weeks, and the same thing happened again. I
swapped the radio
> again yesterday, and today, I'm back in the same boat.
The radio in the
> AP keeps going out. I had the climbers check the
grounding, and we
> actually ran a dedicated ground yesterday off the water
tank. My knee
> jerk feeling today is that maybe the radios are too
close together, and
> the 2450 is burning up the 900. Could this be the case?
Any ideas?
> Here is an example of what happens. Customers that run
signals -47 to
> -57 become -70 to -75 and those who's signals were -70
and up fall clear
> off. Swap the radio, and everything goes back to
normal. This is now
> three radios that have gone, each lasting a much shorter
time than the
> previous. (this one did not make it 24 hours).
> I can't completely rule out lightning - the tower is in
a very wooded
> area. But usually you burn up the NIC in that case -
not weaken the radio.
> Thoughts?
Interesting mystery! Clearly you don't want to blow more
radios this way.
Any more clues about what may have happened right before
the failures?
I'm wondering about weather events. Did it fail after a
rain storm?
Water coming in to the radio or corroding the antenna
connectors might
result. And if the antenna's connector is flaky,
re-attaching it to a
new radio might be a temporary fix, but reattaching it to
an old radio
might "fix" it too (temporariy). Have you examined the
broken radios in
the shop?
--
Fred R. Goldstein fred "at" interisle.net
<http://interisle.net>
Interisle Consulting Group
+1 617 795 2701 <tel:%2B1%20617%20795%202701>
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