I'm suggesting on the AC line if that's where the noise is coming from. My guess is one of two things:
1) somehow the truck is generating rf noise. For example they have a mobile Hotspot or signal booster or something like that. Or some other non obvious source. 2) the truck is generating noise on the electrical system. Check for bad grounds, apply filtering, and so on. Changing the shielding arrangement on the cat5 cable might help. That is add/remove shield, try connecting/grounding the shield on both ends or just the top, or just the bottom. And try grounding the shield without connecting it to the radio. The question here is where is the noise coming from. One way to isolate the power as an option is to try running off a generator. Or have the truck run off the generator. On Mon, Jan 9, 2023, 9:06 AM Josh Luthman <j...@imaginenetworksllc.com> wrote: > 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> 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> >> 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> 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> On Behalf Of Jan-GAMs >>>> Sent: Sunday, January 08, 2023 3:41 PM >>>> To: 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 >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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