Re: [AFMUG] PMP450 5ghz AP possible case water intrusion

[Kurt Fankhauser]

I have had a lot of them fail for this issue, Cambium was initially
repairing/replacing old 450AP's even ones that were out of warranty until
they realized how many I had. Then they started to say that basically since
it was out of warranty they weren't going to do anything anymore. I have an
email from Matt basically admitting that these units are going to fail in
the 4-5 year marks due to design flaw. He basically told me to drill some
holes in the bottom of the case for the water to escape if it got in. I was
so pissed at his response that I didn't even bother email him back. These
units were spec'ed at 40 year MTBF ratings and to admit that basically
after 5 years they were going to fail really got me upset especially when I
have junk Tranzeo's still out in service that are 10+ years old running
flawlessly.

On Thu, Sep 21, 2017 at 8:47 PM, Mark Radabaugh  wrote:

> We have seen a number of them.  Usually where the gortex vent cloth wasn’t
> centered in the hole, or the retaining ring wasn’t fully staked in.   I
> usually plug the vent with mastic and leave out the plug in the timing port
> grommet.
>
> Mark
>
>
> > On Sep 21, 2017, at 8:40 PM, Roland Houin  wrote:
> >
> > yes, we've had a few..
> >
> > roland
> >
> >
> >> I'm investigating a PMP450 5ghz AP (old unit - the original ones that
> came
> > with the FSK port) that failed on the tower. RJ45 and especially RJ12
> ports
> > have white dots on the pins. Looking in the case, there seems to be
> evidence of
> > water intrusion coming from the little temperature/humidity control
> > membrane-covered hole in back. But a quick test of dripping water on the
> case
> > does not cause water intrusion in that hole. Has anyone else seen such
> issues
> > with older PMP450 APs? <
> >
>
>

Re: [AFMUG] PMP450 5ghz AP possible case water intrusion

[Mark Radabaugh]

We have seen a number of them.  Usually where the gortex vent cloth wasn’t 
centered in the hole, or the retaining ring wasn’t fully staked in.   I usually 
plug the vent with mastic and leave out the plug in the timing port grommet.

Mark


> On Sep 21, 2017, at 8:40 PM, Roland Houin  wrote:
> 
> yes, we've had a few..
> 
> roland
> 
> 
>> I'm investigating a PMP450 5ghz AP (old unit - the original ones that came
> with the FSK port) that failed on the tower. RJ45 and especially RJ12 ports
> have white dots on the pins. Looking in the case, there seems to be evidence 
> of
> water intrusion coming from the little temperature/humidity control
> membrane-covered hole in back. But a quick test of dripping water on the case
> does not cause water intrusion in that hole. Has anyone else seen such issues
> with older PMP450 APs? <
> 

Re: [AFMUG] PMP450 5ghz AP possible case water intrusion

[Roland Houin]

yes, we've had a few..

roland


> I'm investigating a PMP450 5ghz AP (old unit - the original ones that came
with the FSK port) that failed on the tower. RJ45 and especially RJ12 ports
have white dots on the pins. Looking in the case, there seems to be evidence of
water intrusion coming from the little temperature/humidity control
membrane-covered hole in back. But a quick test of dripping water on the case
does not cause water intrusion in that hole. Has anyone else seen such issues
with older PMP450 APs? <

Re: [AFMUG] PMP450 5ghz AP possible case water intrusion

[George Skorup]

I've seen some that most certainly let water in through the gore vent. 
One such instance was rain blowing sideways for 20 minutes in a bad 
storm. That probably occurred because the radio was a little over 2 
years old and the coating on the gore patch thing was gone. Basically 
just some mesh stuff left. At least it kept the bugs out. And others 
with covers that apparently weren't sealing right from the factory. Bad 
machining I think on those. Another where a stud wasn't inserted into 
the cover all the way. I took it apart and let it dry out and pushed the 
stud in carefully with a C clamp on the bench.


Other than that, if it's not obvious how water got into a particular 
radio, then I don't know.


On 9/21/2017 4:23 PM, Colin Stanners wrote:
I'm investigating a PMP450 5ghz AP (old unit - the original ones that 
came with the FSK port) that failed on the tower.  RJ45 and especially 
RJ12 ports have white dots on the pins.  Looking in the case, there 
seems to be evidence of water intrusion coming from the little 
temperature/humidity control membrane-covered hole in back. But a 
quick test of dripping water on the case does not cause water 
intrusion in that hole. Has anyone else seen such issues with older 
PMP450 APs?

[AFMUG] PMP450 5ghz AP possible case water intrusion

[Colin Stanners]

I'm investigating a PMP450 5ghz AP (old unit - the original ones that came
with the FSK port) that failed on the tower.  RJ45 and especially RJ12
ports have white dots on the pins.  Looking in the case, there seems to be
evidence of water intrusion coming from the little temperature/humidity
control membrane-covered hole in back. But a quick test of dripping water
on the case does not cause water intrusion in that hole.  Has anyone else
seen such issues with older PMP450 APs?