Just an update on the 40m dsl issue here. I tried the OK filter and it
might have improved things a bit, however it reduced my bandwidth from 7mb
to 6mb. So this might not be a solution for broaderband service.
I am now going to work on common mode current issues.
I do believe the Excelsious filter does help on the high bands. I had taken
it out and my son came over to the shack to complain about internet loss so
I put it back in and no more complaints when I was on 15 and 20.
All very unscientific findings. I need to back down to a minimal setup with
a laptop, dsl and nothing else hooked up and start from there. I got in a
bunch of type 31 ferrite snap ons so hopefully I will get my arms around
this soon.
W0MU
"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: Jim Brown [mailto:jim@audiosystemsgroup.com]
Sent: Wednesday, February 25, 2009 3:08 PM
To: W0MU Mike Fatchett
Subject: Re: [RFI] Zoom X6 DSL Modem loses internet connection
Mike,
If you don't find the Excelsus filter useful, would you like to send it to
me so that I can measure it? I'm working on the EMC chapter for the ARRL
Handbook, and plan to include a few paragraphs on telephone filters. I'll
also post what I learn to my website.
73,
Jim K9YC
On Wed, 25 Feb 2009 09:47:06 -0700, W0MU Mike Fatchett wrote:
>I tried the Excelsious filter and it does not touch my 40m issue.
>Their specs say 10mhz and up. I was hoping they were off a bit. The
>filter appears to be well made. I never noticed problems at those
>frequencies so it is hard to know if it is doing anything.
>I have ordered the parts to build the OK filter. I will post my findings.
>Those parts should be in today or tomorrow.
>"A slip of the foot you may soon recover, but a slip of the tongue you
>may never get over." Ben Franklin -----Original Message-----
>From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
>Behalf Of Jim Brown
>Sent: Friday, February 13, 2009 10:38 AM
>To: RFI List
>Subject: Re: [RFI] Zoom X6 DSL Modem loses internet connection
>On Fri, 13 Feb 2009 10:04:32 -0700, W0MU Mike Fatchett wrote:
>>Any suggestions on where to start would be appreciated. It only seems
>>to happen on 40m.
>You should also call your DSL vendor and tell them that their modem has
>RFI problems, and ask THEM to fix it. It IS their problem, not yours.
>W8JI had issues with his modem, and got a replacement that worked.
>Study http://audiosystemsgroup.com/RFI-Ham.pdf
>If you want to fix it yourself:
>1) Start with a choke tuned to 40M on each cable connected to the DSL
modem.
>2) If that doesn't fix it, leave those chokes in place and add a choke
>at the Ethernet switch or hub.
>3) I've recently learned of a company in SoCal called Excelsus that
>sells filters that they say will eliminate RFI to DSL modems. Google to
find them.
>I'm currently writing the EMC chapter for the ARRL Handbook, and called
>them a week ago for a sample unit so that I could mention them in the
>Hanbook. So far, no response. There's a more established company in
>Ohio called KCOM who makes telephone filters that are well known to
>work very well on telephone lines. It might be worth a phone call to ask if
they have a DSL filter.
>73,
>Jim Brown K9YC
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