I guess the radio manufacturers who put the cable gland on a 45 degree angle, rather than at the lowest point, are looking pretty smart now. Yes, I know, they did it that way so you could rotate it 90 degrees on the antenna to switch polarizations.
From: AF <[email protected]> On Behalf Of castarritt Sent: Wednesday, October 10, 2018 3:20 PM To: [email protected] Subject: Re: [AFMUG] PMP-450m taking on water?? We've had the same problem with the 450M. Last I heard, Cambium is still trying to diagnose the root cause. On Wed, Oct 10, 2018 at 3:09 PM Vlad Sedov <[email protected] <mailto:[email protected]> > wrote: Thanks for the info, Ken. I think there's a pressure equalization vent on the medusa, but not 100% sure. We're about to leave for wispapalloza, and hopefully I'll be able to corner a Cambuim guy there and see what can be done.. lol cheers Vlad On 10/10/2018 2:53 PM, Ken Hohhof wrote: > I don't has specific experience with the 450m, but based on various other > radios through the years, the silicone may not be a good idea. > > What sometimes happens is temperature changes cause pressure or vacuum > inside the sealed enclosure, and when there's a vacuum, it will suck air > and/or moisture in through any crack, including the cable gland. Even if > it's just air, this can lead to condensation inside the radio. I'm guessing > Cambium has one or more Goretex vents on the case, designed to let air in > and out but not water. I remember people reporting that the original 450 > (not 450i) had problems with water intrusion, in some cases due to > improperly installed vents. > > I remember years ago Trango had problems with vacuum inside the case sucking > water into their 5830 series APs, people were sealing with silicone, and > that actually made the problem worse. Trango finally recommended leaving > the cable gland a little loose so water could drip out the bottom, which > isn't exactly a wonderful solution. > > Medusa is like a 450i on steroids, maybe with more air inside the vacuum > effect when temperature drops is enhanced? > > If it's less than a year old, it might still be under warranty, I forget if > that's 90 days or 1 year, assuming you didn't purchase an extended warranty. > Even if it's out of warranty, but due to a manufacturing defect, you might > talk Cambium into replacing or repairing it for free. > > > -----Original Message----- > From: AF <[email protected] <mailto:[email protected]> > On > Behalf Of Vlad Sedov > Sent: Wednesday, October 10, 2018 2:30 PM > To: [email protected] <mailto:[email protected]> > Subject: [AFMUG] PMP-450m taking on water?? > > So we had to climb one of our towers today to deal with a sudden > intermittent ethernet issues with a Medusa that's less than a year old. > We did just have a pretty good storm and were fearing the worst.. When the > weather coupling on the cable got removed, a bit of water poured out, and > the connector had obvious corrosion marks. > A bit of cleanup and a new RJ45 later, the radio is kicking again... But it > seems a bit weird that a $6000+ radio can't hold back a bit of rain. > Last time we've seen this problem was with some older PTP600 and PTP400 > radios, after the o-ring seal failed.. Some were full of oxidation and water > damage. I hope it's just an isolated incident.... > > The climber added a bead of silicone around the perimeter of the radio to > antenna seal it for now, but I wonder if it's worth opening a ticket with > Cambium.. Not a happy camper right meow. > > > cheers > Vlad > > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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