Yes, a Poe injector will do that. Sent from my iPhone
> On Apr 24, 2019, at 6:04 PM, Matt Hoppes <[email protected]> > wrote: > > Does something like an iso coupler for CAT5 exist? Like where you could plug > the cat five cable into it and he would isolate the cat five cable coming out > of it magnetically so that there was no physical contact? > >> On Apr 24, 2019, at 2:51 PM, Bill Prince <[email protected]> wrote: >> >> This was in the days when we had to run a separate cable for timing (and >> those signals we single-ended; not differential). The timing cable ran >> parallel to the cat 5, and the APs were losing sync intermittently. The >> power/ground inside the CMM was going crazy to the tune of 8-12 volts or >> something like that. >> >> We added bigger grounds to the power supply and CMM, and when we got to 4 >> AWG it actually got worse. >> >> >> bp >> <part15sbs{at}gmail{dot}com> >> >>> On 4/24/2019 11:19 AM, Matt Hoppes wrote: >>> Interesting, so possibly the issue is occurring through the >>> grounding/electoral system. >>> >>>> On Apr 24, 2019, at 1:47 PM, Bill Prince <[email protected]> wrote: >>>> >>>> It wasn't actually on the cat5, it was on the ground (and indirectly the >>>> power supply). This when we were using the old-style Canopy timing box >>>> (CMM? not sure of the name any more). >>>> >>>> We had to ground isolate the scope to prevent it from being infected as >>>> well. >>>> >>>> >>>> bp >>>> <part15sbs{at}gmail{dot}com> >>>> >>>>> On 4/24/2019 10:31 AM, Matt Hoppes wrote: >>>>> How did you “look at it” on the CAT5? >>>>> >>>>>> On Apr 24, 2019, at 1:28 PM, Bill Prince <[email protected]> wrote: >>>>>> >>>>>> Back when we were getting interference like this (around 12-13 years >>>>>> ago), the noise was actually intermod from a couple of nearby high power >>>>>> transmitters. We didn't see it until we were able to look at it with a >>>>>> high frequency oscilloscope. >>>>>> >>>>>> It would come and go based on whether both of those transmitters were >>>>>> operating at the same time. >>>>>> >>>>>> >>>>>> bp >>>>>> <part15sbs{at}gmail{dot}com> >>>>>> >>>>>>> On 4/24/2019 9:36 AM, Matt Hoppes wrote: >>>>>>> If I take a volt meter and measure from ground wire/rack to earth >>>>>>> ground. Would I see voltage if the transmitter is getting in at any >>>>>>> significant amount? >>>>>>> >>>>>>>> On Apr 24, 2019, at 12:25 PM, Robert Andrews <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>> & if the noise is coming from the grounding point? >>>>>>>> >>>>>>>>> On 04/24/2019 09:01 AM, [email protected] wrote: >>>>>>>>> If you let shields float, they are a faraday shield. >>>>>>>>> If you ground one end of the shields, they are faraday plus >>>>>>>>> electrostatic shielding. >>>>>>>>> If you ground both ends of the shields they do all of that but they >>>>>>>>> also add magnetic shielding. >>>>>>>>> However grounding both ends can cause a ground loop. >>>>>>>>> -----Original Message----- From: Matt Hoppes >>>>>>>>> Sent: Wednesday, April 24, 2019 9:22 AM >>>>>>>>> To: AnimalFarm Microwave Users Group ; dave >>>>>>>>> Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain >>>>>>>>> Why do you mean "moved switching closer to the cluster", what is a >>>>>>>>> "cluster"? >>>>>>>>> Are you saying you floated the copper shields at the base of the tower >>>>>>>>> and didn't ground them? >>>>>>>>>> On 4/24/19 11:16 AM, dave wrote: >>>>>>>>>> Matt, >>>>>>>>>> I have that T-shirt For sure.. I was on a FM tower that was only 5kw >>>>>>>>>> combined over one 5/8 coax for years. >>>>>>>>>> Started with FSK then Cambium gear. >>>>>>>>>> The things I noticed worse was the type of cable used. The longest >>>>>>>>>> time we had used AL shielded type cable and eventually >>>>>>>>>> relocated our switching near the base of the cluster which helped >>>>>>>>>> for a while but after some time the AL shielding evaporated and >>>>>>>>>> that type of cabling was barely good enough to get 10baseT out of it >>>>>>>>>> and still had CRCs >>>>>>>>>> We eventually moved to Superior Essex for everything on the tower >>>>>>>>>> and used clips,hangers and grommets to get it off the tower leg. >>>>>>>>>> Let the copper shields float on the cables and never looked back. >>>>>>>>>> We have since moved completely off the tower last year but still >>>>>>>>>> didnt have any issues at that time. >>>>>>>>>> >>>>>>>>>> What I did notice is that when we did move our switching and POE >>>>>>>>>> closer to the cluster inside a nema enclosure it cleared a bunch of >>>>>>>>>> issues on the cable for a long time. >>>>>>>>>> >>>>>>>>>> Dave >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> On 4/20/19 10:06 AM, Matt Hoppes wrote: >>>>>>>>>>> What's also interesting is none of the stuff in the shack has >>>>>>>>>>> negotiating issues -- so it doesn't seem to be the switch as a >>>>>>>>>>> whole getting swamped, but rather the CAT5 getting swamped going up >>>>>>>>>>> the tower. >>>>>>>>>>> >>>>>>>>>>>> On 4/20/19 9:58 AM, Chuck McCown wrote: >>>>>>>>>>>> So moisture + rf = Ethernet interference. Just as originally >>>>>>>>>>>> stated. No standing waves. >>>>>>>>>>>> Is your cat5 in liquidtight? Have you played with grounding & >>>>>>>>>>>> ungrounding the shields? How about taking a garden sprayer and >>>>>>>>>>>> selectively wetting things? >>>>>>>>>>>> >>>>>>>>>>>> Sent from my iPhone >>>>>>>>>>>> >>>>>>>>>>>> Begin forwarded message: >>>>>>>>>>>> >>>>>>>>>>>>> *From:* Matt Hoppes <[email protected] >>>>>>>>>>>>> <mailto:[email protected]>> >>>>>>>>>>>>> *Date:* April 20, 2019 at 7:52:12 AM MDT >>>>>>>>>>>>> *To:* Chuck McCown <[email protected] <mailto:[email protected]>> >>>>>>>>>>>>> *Subject:* *Re: [AFMUG] CAT5. FM. And Rain* >>>>>>>>>>>>> >>>>>>>>>>>>> Yes. Problem goes away. >>>>>>>>>>>>> >>>>>>>>>>>>>> On Apr 20, 2019, at 09:51, Chuck McCown <[email protected] >>>>>>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>> Have you killed the ref when you are having the problem? Might >>>>>>>>>>>>>> not be ref related. >>>>>>>>>>>>>> >>>>>>>>>>>>>> Sent from my iPhone >>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Apr 19, 2019, at 7:11 PM, Matt Hoppes >>>>>>>>>>>>>>> <[email protected] >>>>>>>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> 19watts >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> On 4/19/19 8:58 PM, Chuck McCown wrote: >>>>>>>>>>>>>>>> What is the reflected power when you are having problems? >>>>>>>>>>>>>>>> Sent from my iPhone >>>>>>>>>>>>>>>>> On Apr 19, 2019, at 6:41 PM, Matt Hoppes >>>>>>>>>>>>>>>>> <[email protected] >>>>>>>>>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> My thoughts too. But the reflected power right now is only >>>>>>>>>>>>>>>>> 19watts out of 9,000. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> On Apr 19, 2019, at 20:14, Chuck McCown <[email protected] >>>>>>>>>>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> My guess is that the FM station has a problem with the >>>>>>>>>>>>>>>>>> antenna or transmission line. Moisture throws off impedance >>>>>>>>>>>>>>>>>> somewhere and you have a strong standing wave on the >>>>>>>>>>>>>>>>>> transmission line. Probably a bad connector. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Sent from my iPhone >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> On Apr 19, 2019, at 5:52 PM, Matt Hoppes >>>>>>>>>>>>>>>>>>> <[email protected] >>>>>>>>>>>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> Looking to the wisdom of the AF group on this. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> I have some equipment on an FM tower. It’s a 9kw station >>>>>>>>>>>>>>>>>>> around 150ft. We are at 250ft with two sectors and a >>>>>>>>>>>>>>>>>>> backhaul. Netonix switch in shelter. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> Nothing else on the tower. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> Normally all is fine. When it rains or is very moist out >>>>>>>>>>>>>>>>>>> (heavy heavy fog) we start having major Ethernet >>>>>>>>>>>>>>>>>>> negotiation issues. The ports will go from 1Gig to 10F >>>>>>>>>>>>>>>>>>> sometimes. Sometimes drop completely. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> I’ve got ferrite beads wrapped about 5 times top and bottom. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> Any further words of wisdom on what to try? I suspect some >>>>>>>>>>>>>>>>>>> odd grounding issue. But not sure how to track it down or >>>>>>>>>>>>>>>>>>> isolate it. >>>>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>>>> 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 >>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>> AF mailing list >>>>>>>>>>>>>>>>> [email protected] <mailto:[email protected]> >>>>>>>>>>>>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>>> -- >>>>>>>> AF mailing list >>>>>>>> [email protected] >>>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>> -- >>>>>> AF mailing list >>>>>> [email protected] >>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
