Be fun to see if the problem changes when switching to a different antenna and or transmission line.
From: Matt Hoppes Sent: Saturday, April 20, 2019 12:28 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain I believe there is a spare antenna already connected. I’ll have to check on Monday. On Apr 20, 2019, at 14:22, <[email protected]> <[email protected]> wrote: Do they have a spare FM antenna you could connect to a temp line and perhaps pull it up the tower while on? I know I am getting increasingly crazy with ideas here but just spitballing. From: Matt Hoppes Sent: Saturday, April 20, 2019 12:17 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain The Nautel doesn’t ramp. It’s all or nothing. On Apr 20, 2019, at 13:03, Chuck McCown <[email protected]> wrote: Would you be allowed to ramp up the RF and see what levels cause what kinds of problems? From: Chuck McCown Sent: Saturday, April 20, 2019 10:47 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain Do you have perhaps a grounding issue at one end or the other? Most ethernet devices have phy transformers that ground directly or through a capacitor. Ground potential differences between one end and the other can cause a problem like this. If you are connected to an earth ground that changes with moisture then perhaps a ground loop is causing problems. This seems backwards but it may be ground related somehow. Fiber Spray water Liquidtight I hate to suggest the intermod theory as it seems a bit unlikely to have intermod strong enough to interfere with an ethernet signal, but not too many things left to think. From: Matt Hoppes Sent: Saturday, April 20, 2019 10:41 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain The issue has gotten worse over the last two years. With it be terrible right now. We just reran cable last month. All new cable and radios. And still having the issue. On Apr 20, 2019, at 12:03, Chuck McCown <[email protected]> wrote: You would have to climb it with a garden sprayer strapped to your back. I am more of the opinion of the corroded RJ45. From: Matt Hoppes Sent: Saturday, April 20, 2019 8:42 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Fwd: CAT5. FM. And Rain Not in liquidtight. Have ground lifted and grounded. No change. Have not wet things (would be difficult - no ready source of water) Obviously RF is getting into the Ethernet, when things are wet. I’m just trying to figure out why. Clearly a connection is being made somewhere it shouldn’t be. On Apr 20, 2019, at 09:58, Chuck McCown <[email protected]> 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]> Date: April 20, 2019 at 7:52:12 AM MDT To: Chuck McCown <[email protected]> Subject: Re: [AFMUG] CAT5. FM. And Rain Yes. Problem goes away. On Apr 20, 2019, at 09:51, Chuck McCown <[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]> 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]> 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]> 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]> 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. 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