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?
>>
>>
>
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