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

[Dave Cole (NK7Z)]

That's funny...  In a sort of sad way...

73s and thanks,
Dave
NK7Z
https://www.nk7z.net

On 03/29/2018 08:28 AM, Jeff Blaine wrote:
> 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 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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