Not shielded cable, but still a good idea.
This person doesn't have HAM equipment, but I'm thinking something along
the same lines. Maybe a device in the house is inserting this signal on
the neutral or ground wire of the A/C. Maybe A/C ground is bonded to
D/C ground in the PoE. Maybe D/C ground is bonded to a ground plane in
the panel antenna. Lots of maybes there. Maybe I'm talking out of my
hole.
------ Original Message ------
From: "George Skorup" <geo...@cbcast.com>
To: af@afmug.com
Sent: 1/23/2017 10:39:18 PM
Subject: Re: [AFMUG] Weird cellular interference issue
Is it shielded cable? Sounds like the shield has become a radiator, aka
antenna. Detune it by adding or removing some cable length?
On 1/23/2017 9:32 PM, That One Guy /sarcasm wrote:
place the poe in a faraday cage, it will resolve it, we have a HAM guy
that has something in 800mhz, same issue, suggested he do that, it
resolved it, he didnt describe what cage he built
On Mon, Jan 23, 2017 at 9:24 PM, Adam Moffett <dmmoff...@gmail.com>
wrote:
This is above my pay grade.
One of our customers was contacted by AT&T, and the customer put them
in touch with us. AT&T was tracking down a source of interference.
The interference was on a 10mhz wide channel centered on 828mhz. At
their tower, AT&T is seeing it 15-20db above the noise floor, so it's
pretty significant.
Using their spectrum analyzer they tracked it down to our customer's
house. The customer has a wimax CPE on their roof. Unplugging the
CPE makes the interference go away, plugging it back in brings the
interference back. Every time. AT&T guy goes to another customer's
house and confirms that other CPE at different locations don't
produce this interference.
We figure it's a malfunction in the CPE, so we replace it.
Interference still present.
We replaced the PoE. Interference still present.
So we know the Wimax unit doesn't originate the 828mhz signal, but
it's somehow an accidental component of a system that does.
WTF could be going on?
--
If you only see yourself as part of the team but you don't see your
team as part of yourself you have already failed as part of the team.
