Firewall interference
 

I have a CompUSA cable router/firewall. It is causing RFI about
14.335 and various other places throughout the ham bands.

I tried wrapping it in aluminum foil. Someone suggested I try
wrapping my network wires in a toroid, but I haven't tried that yet.
It is a 100 base T switch with a 10 base T Internet connection.

Thanks for the suggestions.


--
73 for now
Buck
N4PGW

I have a CompUSA cable router/firewall. It is causing RFI about
14.335 and various other places throughout the ham bands.

I tried wrapping it in aluminum foil.

I assume that didn't help? If so, it suggests that the primary path
of interference may be conducted (through the network cables and/or
the power line) rather than directly radiated from the enclosure.

Someone suggested I try
wrapping my network wires in a toroid, but I haven't tried that yet.
It is a 100 base T switch with a 10 base T Internet connection.

Thanks for the suggestions.

I agree, try wrapping the network cables through a ferrite toroid
several times. Keep the toroid as close as possible to the case, so
as to minimize the amount of exposed wire between the case and the
toroid.

Try the same thing with the power wire. Toroids are your friends.

Try seeing if the interference occurs even when the network cables are
not connected i.e. when the router is receiving power but isn't
connected to any of the networks. I've seen at least one device which
wasn't bad when first powered up, but as soon as a network cable was
attached it started to radiate interference on the 2-meter band which
was strong enough to peg my HT's crude S-meter from 15 feet away.

You may find that your only good choice is to return the router to the
store, and buy a different brand. It's possible that the one you
bought isn't actually complying with the FCC Part 15 radiated and
conducted emission limits... and even if it is, it's clearly radiating
enough to be a problem for you.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

"Buck" wrote in message
...
I have a CompUSA cable router/firewall. It is causing RFI about
14.335 and various other places throughout the ham bands.

I tried wrapping it in aluminum foil. Someone suggested I try
wrapping my network wires in a toroid, but I haven't tried that yet.
It is a 100 base T switch with a 10 base T Internet connection.

Thanks for the suggestions.


14.335 MHz?

Al starts working about 2-5 MHz, copper a little lower. Steel is far better
at lower frequencys.

Get some clamp-on ferrites for all the cables they are about 3/4 by 3/4 by 2
inches plastic case that snaps shut, and has a big ferrite piece inside it
two C sections that clampon the cable.