I don't need to guess the Ethernet spur frequencies - thanks to Murphy
they seem to be on MY QRG automagically!!! :)
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 29-Mar-18 11:08 PM, Dave Cole (NK7Z) wrote:
Take a look at:
https://www.nk7z.net/rfi-snapshots/
just below the first image of Ethernet RFI is a list of frequencies
you can expect to find Ethernet RFI on...
Also, if anyone has images of KNOWN RFI sources, please shoot them to
me off list and I will include them on the RFI Snapshots page.
73s and thanks,
Dave
NK7Z
https://www.nk7z.net
On 03/29/2018 07:16 AM, Chris wrote:
That's what I hear as well...birdies spaced evenly across the
band(s). Not s9 or anything like that, but still real annoying!! I
guess that is the price we pay for modern technology.
Chris
KF7P
On Mar 29, 2018, at 8:13 AM, jonie41 jonie41 wrote:
Our ADSL modem is in my shack sitting on top of my computer. I use
Ethernet to
the shack computer, a four bay NAS and two 50ft runs of CAT5 to two
other
computers located quite close to the shack. Yes, if I find a quiet
spot on a
band and it coincides with a birdie, I can just hear the birdie, if
I shut down
the computer, all goes quiet.
Could I just be lucky or possibly ignorant of the level of RFI?
John
VE3KKQ
---------- Original Message ----------
From: Chris <EZRhino@fastmovers.biz>
Date: March 29, 2018 at 8:59 AM
Hi Jeff,
I've got an ethernet line from a rooftop dish coming into my shack
along with
the other incoming coax lines, and the router was right there
behind my shack
desk. No amount of ferrite at multiple places along the ethernet
cable--before the router, after the router, on the power cord,
etc.--would
make any difference on the noise heard on the radio. Even shielded
cat5
didn't help. My solution was the run the router away from the
shack, just a
dozen feet or so into the other room, and then use wifi to get
internet to my
computer instead of a direct connection. Ethernet is a horrible
thing for
RFI!
Good luck.
Chris
KF7P
On Mar 29, 2018, at 12:22 AM, Jeff Blaine wrote:
In the process of overhauling the shack's wiring, I'm wanting to
replace my
existing ethernet switch with a box that is properly shielded - or
at least
has one with a low emission footprint. Here i'm talking about
radiation from
the box itself - not via the connected ethernet lan cable runs.
Unfortunately the houses' home-run location terminates a few feet
from my
shack and so the switch needs to be located there. I can apply
ferrite /
common mode treatment to the power supply and lan cables that
connect to the
box. But I also need a box that is properly shielded from a ham
point-of-view. The switches I have now are all of the
plastic-case variety
and they all are pretty noisy.
I was hoping someone may have found a "quite" switch that could be
recommended. Some of the semi-pro (e.g. Netgear home-office rack
mount)
stuff has metal cases -- but I don't know if that actually means
they are
quieter.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
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