I’ve had success with ferrites, but I got them with high impedance at the frequency of the other guy’s transmitter, and I got ginormous ones that I could loop the ethernet through a whole bunch of times.
Someone on this list informed me that impedance is squared by the number of turns the cable takes through the ferrite, so I get one like 2” diameter and I coil it through as many times as will fit. If you don’t know the frequency of the interference then it’s harder, but you might assume it’s 60hz if it’s really from a motor or some such. From: AF <af-boun...@af.afmug.com> On Behalf Of Josh Luthman Sent: Monday, January 09, 2023 11:05 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] backup power for small tower I had a 0% success rate with ferrite. I have a 100% success rate with fiber (up the tower). On Mon, Jan 9, 2023 at 10:57 AM Forrest Christian (List Account) <li...@packetflux.com <mailto:li...@packetflux.com> > wrote: Agreed. And if it's on the ethernet side, just adding some ferrite chokes to the power line might fix the problem. Or switching to shielded cable. On Mon, Jan 9, 2023, 7:52 AM Josh Luthman <j...@imaginenetworksllc.com <mailto:j...@imaginenetworksllc.com> > wrote: Step 1 is to figure out where your packet loss is coming from. If it's interference on the RF side, changing to a DC plant is a complete waste of time/money. On Mon, Jan 9, 2023 at 9:21 AM <dmmoff...@gmail.com <mailto:dmmoff...@gmail.com> > wrote: Usually when people say "DC plant" they mean a rectifier. A charger + inverter like you proposed would probably also count as having DC power plant. I used one of these once: https://www.aimscorp.net/12-Volt-Pure-Sine-Inverter-Chargers/ Worked fine, but no remote management. I'm sure there are a dozen options out there to pick from. An isolation transformer might be a less intrusive change. Tripp Lite makes some affordable ones. On the trip lite ones I had the hot and neutral were isolated, but the ground passed straight through. Depending on where the noise is coming from that might not fix it, but you can test an isolated ground by snapping off the ground prong on the transformer or using a 2-prong adapter. I say "test" because you shouldn't run without a ground permanently. -----Original Message----- From: AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com> > On Behalf Of Jan-GAMs Sent: Sunday, January 08, 2023 3:41 PM To: af@af.afmug.com <mailto:af@af.afmug.com> Subject: Re: [AFMUG] backup power for small tower It's in a parking-lot of a business and they started plugging their food truck into the power-source. So what do you mean by "DC plant"? On 1/8/23 12:20, Bill Prince wrote: > If your site is 100% DC-powered, the batteries should provide all the > isolation you need. My suggestion is to just switch to DC plant. > > > bp > <part15sbs{at}gmail{dot}com> > > On 1/8/2023 11:21 AM, Jan-GAMs wrote: >> Ever since a food truck started plugging their truck into the same >> power source we use we've been experiencing severe packet loss >> through it. Possibly electrical motor-hum? Anyway, I'm wondering >> what is available or suggested to use to place a better electrical >> isolation for a battery backup in the box on the tower. >> >> We're using two ubiquiti radios one cheap ubiquiti router and a Cisco >> fiber to ether-net router. We have a cyberpower 450va that provides >> power for less than an hour when we have a power outage. It would be >> better if we could use something more hefty. The NEMA box is 2ft x >> 2ft x 8in. Inside is 2ft x 2ft x 6in. So there isn't much room. >> >> I'm thinking maybe a stack of batteries, a charger and a sine-wave >> invertor? Unless someone knows of a product that would do what's >> needed? >> >> > -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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