[RFI] Wired vs Wireless Routers for RFI

K4RO Kirk Pickering k4ro at k4ro.net
Wed Jan 9 13:17:59 EST 2008

Hello John,

I wonder what speed Ethernet you are running?
I have tried 3 different brands and vinatges of
wired hubs for my home 10-base-T network. Every 
device tried caused terrible RFI at 100MBPS. I finally
reverted to using a 15-year old 10-base-T hub, which
forces all the cards to run at 10 instead of 100MBPS.
With this hub, I run three servers (Linux) and two desktops 
(one XP and one Mac) in the house with minimal RFI.  
I rarely notice the difference in speed except when 
moving really huge files across the network.


-Kirk  K4RO

On Wed, Jan 09, 2008 at 09:16:34AM -0800, John Geiger wrote:
> I have tried 3 different wireless routers(Linksys,
> Netgear, and Ativa) and all 3 have put birdies on the
> 20 meter band (maybe other places, but it is so bad on
> 20m I gave up and didn't check other bands).  I was
> using them in a wired fashion, and all 3 put birdies
> on the same frequencies, which makes me think that it
> is something related to the workings of the router. 
> The ethernet wires I have run around the house are
> radiating the birdies, as they disappear when I
> disconnect the wires.  However, I cannot afford to go
> wireless right now with buying all of the wireless
> equipment.
> Are wired routers using exactly the same circuitry
> (meaning they cause the same birdies) or have people
> found wired routers to be quieter RF wise.  I will
> probably break down and try one anyways, but thought I
> would try to get some feedback first.
> I am back to using my ethernet hub which is quiet with
> the ethernet wires running around the house, but the
> ISP will only give me 2 IP addresses, so the computer
> sitting next to the radio hasn't been connected to the
> internet for a couple of weeks.
> 73s John AA5JG

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