[RFI] Anyone have any luck with RF-proofing CenturyLink Fiber?

Hisashi T Fujinaka htodd at twofifty.com
Thu Apr 9 11:45:08 EDT 2020

OK. I just tried 20M and didn't have any issues. 40M was my problem last

I'm not sure of what the equipment nomenclature is. I have two units,
fiber-to-copper, and then a router following it. The fiber-to-copper is
what is resetting.

The ferrite appears to be working. I'll call CenturyLink after all this
COVID-19 has died down.

On Thu, 9 Apr 2020, Eddie Edwards wrote:

> Todd,
> I'm assuming you do NOT have their Prism TV especially their wireless TV
> option which radiate strong RFI everywhere even blocking garage door openers
> at 400MHz.  Had to have cat 5e installed to each TV to fix that.
> Also assuming by "goes offline" you mean your wireless router dies?
> The original router CenturyLink install for my internet & Prism TV was
> fairly clean; no RFI in or out of it with no need to add ferrites or
> anything.  Then that clean router died.  CenturyLink gave me another
> IP/Prism router (apparently the last one for PrismTV/Internet as Prism is
> being phased out).
> The replacement router also seemed clean of RFI (out or in) until I operated
> on 40 meters using my 80 meter inverted L antenna during a contest.  That
> shut down the wireless router.
> With no 31mix ferrites on hand at that time, I added a 43mix ferrite to the
> wireless router's power cable.  It still died when transmitting on 40
> meters.
> Added another 43 to the main data cable from the fiber to copper converter
> at the input to the wireless router.  This worked, and stopped 40 meters
> from killing the router.
> So the copper data cable was probably bringing RFI into the house/router
> killing the router.  It had nothing to do with the fiber to copper converter
> outdoors other than that was the entry path into the router.
> Note:  I only run 100watts barefoot-no amp.  Inverted L antenna was designed
> for 80 meters, not 40 meters.  So had to use an antenna tuner.  Inverted L
> is only about 15-20 ft from the fiber to copper converter along the back of
> the house.
> And as K9YC stated, ask CenturyLink for a new router that doesn't receive or
> emit RF signals.
> 73, de ed -K0iL
> -----Original Message-----
> From: RFI <rfi-bounces+eddieedwards=centurylink.net at contesting.com> On
> Behalf Of Hisashi T Fujinaka
> Sent: Thursday, April 9, 2020 00:12
> To: rfi at contesting.com
> Subject: [RFI] Anyone have any luck with RF-proofing CenturyLink Fiber?
> I swear I saw something about this somewhere but I can't find it in the
> archives. I just switched to CenturyLink fiber and even though it's all the
> way on the other side of the house from the HF antenna, it goes offline
> every time I transmit on FT8.
> I put a ferrite on the router power supply, but I think it's the box that
> takes the fiber and turns it into signals on copper. I'll do some more
> experimenting but has anyone had any issues with RF and their fiber
> internet?
> Thanks.
> Todd K7EMI
> --
> Hisashi T Fujinaka - htodd at twofifty.com
> BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi

Hisashi T Fujinaka - htodd at twofifty.com
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee

More information about the RFI mailing list