I am of the opinion that most if not all the issues associated with
"noisy networks" is cheap switching power supplies that comes with the
equipment. Cat5/6 cable in and of itself is pretty immune to noise
pickup because of the twist in the conductors. That twist is there to
knock down crosstalk on the 4 pairs when in full duplex Ethernet
service. The only warning I'm aware of concerning routing of Cat5/6 is
to keep it away from power runs. Most definitely do not run it parallel
for any distance with unshielded romex, and if you have to cross romex
do it perpendicular to the romex run.
I've seen new houses built with all the wire running parallel in a piece
of conduit in the wall. Looks pretty but a recipe for all sorts of
problems like slower than expected or advertised network performance
etc....Power up from the basement and Ethernet down from the attic is a
good idea.
On 2/6/2016 12:03 PM, Bob McGraw K4TAX wrote:
After reading all of this, I investigated my system here. First, no
birdies found on any of the bands. WHEW! Noise on the 160M center
fed wire w/balanced feed line is about S-3 this morning, noise on the
coax fed 75M inverted V is S-2, and noise on the coax fed 40M
inverted V is S-3, and noise on the coax fed 20M inverted V is S-3.
These seem to be a bit higher then normal but it is Saturday and
everybody is home in the neighborhood.
Our system arrives with fiber underground to the box the TELCO
provided on the end of the house. Out of that box runs a CAT5E cable
up the wall, into the attic, across the attic and drops through the
ceiling, then around the bookcase desk to the modem/switch sitting
under the desk. The modem/switch is a CISCO LinkSys EA4500. Two of
the ports are being used, printer and laptop, and the other two are
open. The power for the modem/switch, power for the computer, the
printer, the CLF lamp on the desk along with the radios all come from
one power source being a dedicated 20A service back to the main
breaker panel, again at the far end of the house, on the inside wall,
being the same wall the CAT5E cable runs up to the attic. The run
from the TELCO box to the station is about 75 ft. Same from the
breaker panel to the operating position for station and amp power.
Those feeds are #12-2 w/ ground and #10-3 w/ground respectively.
Being in the middle and upstairs of a 2 story house there is no
station ground to the outside world, other than the provided safety
3rd pin ground as required. I do have a dedicated 240V 20A service
for the amp and that service is in the attic back to the main breaker
panel.
Antennas are all above the roof, no more than 50 ft and less with the
tower at the corner of the house, and mostly less with a couple, 40M
wire and 20M wire actually having the ends terminated at the eve of
the 2nd story. The point being, there is not a lot of physical
separation between the CAT5E cable and the antennas and power wiring.
To me it is very puzzling why so many seem to have issues and a few do
not. I could elaborate about station equipment connectivity. It
would most likely start a controversy as to what is correct and what
is incorrect. My point, if one is having issues, this should trigger
a thought to investigate how and what is configured with the station.
In some cases, I'm sure certain equipment is more prone to generate
noise/birdies than others.
73
Bob, K4TAX
--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441
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