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

Subject: Re: [RFI] ethernet switch with shielded case or low emission spectrum
From: Chris <ezrhino@fastmovers.biz>
Date: Thu, 29 Mar 2018 08:16:02 -0600
List-post: <mailto:rfi@contesting.com>
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
>>> 
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>> 
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> 

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