But would the gigabit PoE not jump the non powered pins? Or are all pins “powered”?
> On Apr 25, 2019, at 9:35 PM, Chuck McCown <[email protected]> wrote: > > Depends on the voltage. The windings have good insulation on them. And the > inductance of the transformer might choke out some of the signal. > > -----Original Message----- From: Matt Hoppes > Sent: Thursday, April 25, 2019 7:33 PM > To: Chuck McCown > Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain > > Interesting -- I assume one could test that by throwing a continuity > tester on the pins. > > Wouldn't a high voltage FM on the line be enough to jump even an air gap > like that? > >> On 4/25/19 9:32 PM, Chuck McCown wrote: >> Generally the transformer is not connected from one side to the other. >> >> -----Original Message----- From: Matt Hoppes >> Sent: Thursday, April 25, 2019 7:26 PM >> To: Chuck McCown ; AnimalFarm Microwave Users Group >> Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain >> >> So a PoE injector without being plugged into the wall? I would have >> thought the pins were soldered together inside? >> >>> On 4/25/19 9:30 AM, Chuck McCown wrote: >>> 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
