Water caused us an issue on a RG-30 2ft dish a couple years ago. Signals degraded slightly over the first year, then a deluge of spring rains caused huge signal losses.

It was not a slant polarized horn. We had pulled rockets out and replaced with AF5x's.


It was the feed horn. When the antenna was lowered water poured out the front. Once it dried a radome cover was added and we put it back in service. No problems since.




On 1/22/2018 2:31 PM, Mathew Howard wrote:
We had one AF-5x link where one chain dropped by 10 or 15db (I don't remember exacty... it was awhile ago), and changing the radios and pigtails on both ends of the link made no difference. We ended up fixing it by replacing one of the dishes.

My best guess was that the feedhorn itself had some water in it (this was probably one of our oldest Rocket dishes), but by the time I got it back to the shop and dissected it, everything was dry, so I never could prove it.

------------------------------------------------------------------------
*From:* [email protected] [[email protected]] on behalf of Josh Luthman [[email protected]]
*Sent:* Monday, January 22, 2018 9:20 AM
*To:* Ubiquiti Users Group
*Subject:* Re: [Ubnt_users] AF5x bad signal problems

This is what we did - new radios and jumpers on both sides.  It cleared up for a few days and at this point it looks like chain1 is ~10 db lower than chain0 (which is back to the 60s).  We'll see what happens after a couple of days, it's passing way more bandwidth than what we need so it isn't necessary to get that last few bits.


Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

On Mon, Jan 22, 2018 at 10:09 AM, Kurt Fankhauser <[email protected] <mailto:[email protected]>> wrote:

    swap radios on both ends just to start ruling stuff out....

    On Sat, Jan 20, 2018 at 10:18 AM, Mitch <[email protected]
    <mailto:[email protected]>> wrote:

        This is a similar issue we had with AF5U and never got fixed

        UBNT still says it's thermal???



        On 1/19/2018 11:03 PM, RickG wrote:
        True. I'm now dealing with a bunch of my 900MHz towers doing
        the same thing :(

        On Fri, Jan 19, 2018 at 5:55 PM, Josh Luthman
        <[email protected]
        <mailto:[email protected]>> wrote:

            Really weird that both pig tails have the exact same
            level of problems, though.  Both chains dropped from 60s
            to 80s to 95+ and the link obviously disappeared.  The
            signals reported on the AirOS interface, I mean.

            Spectrum scan still shows -50 to nearby APs and -60 on
            the BH frequency.


            Josh Luthman
            Office: 937-552-2340 <tel:%28937%29%20552-2340>
            Direct: 937-552-2343 <tel:%28937%29%20552-2343>
            1100 Wayne St
            Suite 1337
            Troy, OH 45373

            On Fri, Jan 19, 2018 at 5:52 PM, RickG
            <[email protected] <mailto:[email protected]>> wrote:

                I've had a flurry of bad pigtails lately :(

                On Fri, Jan 19, 2018 at 5:43 PM, Josh Luthman
                <[email protected]
                <mailto:[email protected]>> wrote:

                    This came back up...exact same issue. Definitely
                    not ice today!

                    Spectrum scan sees upper and lower bands just
                    fine. Both sides see each other at -60ish.  It
                    attempts to register and fail

                    Is there any possibility besides bad jumper/radio?

                    Josh Luthman
                    Office: 937-552-2340 <tel:%28937%29%20552-2340>
                    Direct: 937-552-2343 <tel:%28937%29%20552-2343>
                    1100 Wayne St
                    Suite 1337
                    Troy, OH 45373

                    On Jan 12, 2018 2:29 PM, "Josh Luthman"
                    <[email protected]
                    <mailto:[email protected]>> wrote:

                        Well I brought the power down to -60/61 to be
                        nice!  Also higher modulation...


                        Josh Luthman
                        Office: 937-552-2340 <tel:%28937%29%20552-2340>
                        Direct: 937-552-2343 <tel:%28937%29%20552-2343>
                        1100 Wayne St
                        Suite 1337
                        Troy, OH 45373

                        On Fri, Jan 12, 2018 at 1:55 PM, Kurt
                        Fankhauser <[email protected]
                        <mailto:[email protected]>> wrote:

                            sun must have melted the ice off, i have
                            had some links with ice that get affected
                            and some that didn't, very strange
                            sometimes, just have high link margins is
                            about the only thing you can do.

                            On Fri, Jan 12, 2018 at 12:31 PM, Josh
                            Luthman <[email protected]
                            <mailto:[email protected]>> wrote:

                                Right on the money. Back up to 61 now.

                                Josh Luthman
                                Office: 937-552-2340
                                <tel:%28937%29%20552-2340>
                                Direct: 937-552-2343
                                <tel:%28937%29%20552-2343>
                                1100 Wayne St
                                Suite 1337
                                Troy, OH 45373

                                On Jan 12, 2018 11:40 AM, "Josh
                                Luthman" <[email protected]
                                <mailto:[email protected]>>
                                wrote:

                                    Well I thought exactly that at
                                    first but I do have radomes and
                                    another north/south link that has
                                    0 change.


                                    Josh Luthman
                                    Office: 937-552-2340
                                    <tel:%28937%29%20552-2340>
                                    Direct: 937-552-2343
                                    <tel:%28937%29%20552-2343>
                                    1100 Wayne St
                                    Suite 1337
                                    Troy, OH 45373

                                    On Fri, Jan 12, 2018 at 11:39 AM,
                                    Kurt Fankhauser
                                    <[email protected]
                                    <mailto:[email protected]>>
                                    wrote:

                                        If you have a backhaul
                                        covered in ice i can almost
                                        guarantee that the ice is
                                        causing your signal being
                                        down, seen this a couple
                                        winters ago on an AF5X link
                                        with 2 foot dishes, your
                                        pretty much screwed until the
                                        ice melts off..

                                        On Fri, Jan 12, 2018 at 11:36
                                        AM, Josh Luthman
                                        <[email protected]
                                        <mailto:[email protected]>>
                                        wrote:

                                            Had a wind/storm and
                                            everything come through,
                                            wind picked up at 4am and
                                            4:30-5 we went from 61 db
                                            to 70 and a bit later
                                            down to 80 db. Everything
                                            is covered in ice.  BH is
                                            12.5 miles north/south.

                                            Have another BH 12.5
                                            miles north/south (in
                                            line with the af5x) with
                                            no problems. Ruled out
                                            thermal inversion or
                                            anything because of this.

                                            Any ideas besides bad
                                            jumpers/water or the dish
                                            got moved?  It was only
                                            25 mph winds, which
                                            admittedly is pretty
                                            faster for here, but just
                                            wanted to bounce ideas
                                            before climbing.

                                            Josh Luthman
                                            Office: 937-552-2340
                                            <tel:%28937%29%20552-2340>
                                            Direct: 937-552-2343
                                            <tel:%28937%29%20552-2343>
                                            1100 Wayne St
                                            Suite 1337
                                            Troy, OH 45373

                                            
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