Rofl what kind of question is that? We both know there's no ground rod. On Tue, Jan 10, 2023 at 12:44 PM Chuck McCown via AF <af@af.afmug.com> wrote:
> Does the truck have a ground rod driven? I think that may be a > requirement. Could be a weird ground loop situation. > > > *From:* Jan-GAMs > *Sent:* Tuesday, January 10, 2023 10:40 AM > *To:* af@af.afmug.com > *Subject:* Re: [AFMUG] backup power for small tower > > > yes, voltage is reading 122v ac. The decimal point seems to wander, > hinting there is some noise. I don't have an o-scope available. When I do > a "site survey" I read no signals stronger than -67dbm. > On 1/9/23 15:29, Chuck McCown via AF wrote: > > Maybe they are causing enough voltage drop to noise up your power supplies. > Have you checked the AC voltage? > > *From:* Jan-GAMs > *Sent:* Monday, January 9, 2023 3:50 PM > *To:* af@af.afmug.com > *Subject:* Re: [AFMUG] backup power for small tower > > > We are already using shielded ethernet cable. The truck is parked about > 40ft from the pole with two heavy guage extension cords plugged into > outlets at the base of the pole and about a 90 degree angle from the beam > direction of one radio and 180 degrees from the other radio, They would > have to be purposefully jamming with higher power from inside the truck. > Of course these are ubiquiti plastic radios, not metal housings. > > I'm trying to get my hands on some line-conditioners to see if that will > make a difference. > On 1/9/23 08:37, Forrest Christian (List Account) wrote: > > 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 >> > > ------------------------------ > -- > 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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