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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