[RFI] ethernet switch with shielded case or low emission spectrum

[Dave Cole (NK7Z)]

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 at 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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>>>
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>>
> 
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