Hi, Jim.  It's not the printer; it's either the wall wart to the 
switch or the switch itself.  Through the usual process of 
elimination, I found the culprit.  Sort of suspected it, but checked 
anyway.  Annoying, and perhaps I'll only hook it up when my YL needs 
the printer.  Unplugged the switch and the noise 
disappeared.  However, a better solution would be greatly 
appreciated.--Matt, N1IBB.

At 11:43 AM 7/25/2015 -0400, you wrote:
>Matt,
>It's much more likely to be the power supply module for the network device
>than to be the network switch itself. Also, laser printers are very noisy.
>Mine is so bad that I have to leave it powered off unless I'm printing
>something.
>
>Try turning off the printer and try swapping out the power brick for the
>switch. One of those 5VDC units here was really killing most HF bands,
>especially 80 through 20. I used one from another device and it fixed it.
>Finally I bought a bunch of 12 to 5 volt DC to DC converters on EBay and I'm
>gradually eliminating all the power bricks and running the network gear off
>the shack 12 Volt supply.
>
>73, Jim
>
>
>-----Original Message-----
>From: For blind ham radio operators [mailto:[log in to unmask]]
>On Behalf Of Matthew Chao
>Sent: Saturday, July 25, 2015 11:29 AM
>To: [log in to unmask]
>Subject: Noisy Network Switch
>
>Hi, Folks.  It's not the radio that's creating RF, but the network switch.
>Seems that since I installed a network switch to enable my YL to access my
>printer, I've had some RFI on my 2-meter rig in the shack.  After turning
>off different possible sources, I traced the noise to the network switch.
>Now, what's the best way to reduce the noise?  Pretty amazing how, for once,
>it's not our radios that are the culprits, but a piece of consumer
>electronics, hi, hi.  Thanks for any advice you might have.--Matt, N1IBB.