Erik, Thanks for the input. I'll swap ports and power supplies. That makes sense.
As for running too hot, I conversed with Dan Soles, field engineer for Cambium when he visited, about that very thing. He strongly urged me not to even worry about balancing. He says run everything wide open all the time - all SM's and all AP's. Now, I'm not disputing you - I don't know enough too. I'm just relaying what the Cambium engineer told me. Thanks, Dave Hannum On Thu, Jun 13, 2013 at 1:29 PM, Erik Anderson <[email protected]>wrote: > 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]>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]> 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]>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 >>>> >>>> fax. 419-617-0110 >>>> >>>> *From:* [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]> >>>> wrote: >>>> >>>> That's why I said antenna. It happened frequently after changing the >>>> antenna. >>>> >>>> --- On *Thu, 6/13/13, David Hannum <[email protected]>* wrote: >>>> >>>> >>>> From: David Hannum <[email protected]> >>>> >>>> >>>> Subject: Re: [WISPA] Strange problem with Canopy 9000APC >>>> >>>> To: "WISPA General List" <[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 >>>> Interisle Consulting Group >>>> +1 617 795 2701 <%2B1%20617%20795%202701> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> [email protected] <http://mc/[email protected]> >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>>> >>>> >>>> >>>> -----Inline Attachment Follows----- >>>> >>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> [email protected] <http://mc/[email protected]> >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> [email protected] >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> [email protected] >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> [email protected] >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >> >> _______________________________________________ >> Wireless mailing list >> [email protected] >> http://lists.wispa.org/mailman/listinfo/wireless >> >> > > > _______________________________________________ > Wireless mailing > [email protected]http://lists.wispa.org/mailman/listinfo/wireless > > > > _______________________________________________ > Wireless mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/wireless > >
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