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internet dead while transmitting

TIM3Kmart
TIM3Kmart Member ✭
in Networking
During transmit, the internet connection to my PC goes dead, then returns upon receive. This has occurred since 8600 was purchased earlier this year and on many versions of SSDR, plus 2 different computers. Happens on all antennas, any mode, any power. Station coax and leads are properly RFI filtered with no signs of RF in shack. Not operating remote. Appears not to be a cable modem problem as all other feeds still work fine. 40' run from modem to switch has DX Engineering filters on both ends. Perhaps its something with the TP-8G108E 10/100/1000 metal cased Switch in the shack. Unfortunately, the drop outs can cause N1MM telnet sessions to be disconnected during a contest. Any ideas out there??? Tim, AB0S

Answers

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Hi Tim, I had a similar problem. It turned out to be RF getting into my router, switch and computer. I had to put ferrites on all ethernet and power cables, including those not related to my ham radio operation. I also had to put ferrites on all cables coming into my computer (ethernet, USB and power).

    While my Flexes are reasonably RF proof, I wound up putting ferrites on all the radio cables as well, just to be sure. Now, I am able to operate 500 watts on any band without issue.

    By the way, I see you in my log from the recent 160 meter CW contest!

  • TIM3Kmart
    TIM3Kmart Member ✭
    Hi Len! Great to work you in the 160m.

    ALL ethernet cables in the shack have ferrites. The CAT6 going to the cable modem has the expensive DXE filters at both ends. No other CAT cables to the modem (except for Flex and shack computer, totally wireless. Modem has ferrites on RG6 cable coming from outside box and power line. In shack have 5kw line isolator balun. Same at all antennas. Everything grounded together, including house electrical, ufer tower base, and 16 ground rod spoke system occupying much of back yard. 8600 power supply and PC on Morgan Systems AC filter plus UPS. Mic and speakers have ferrites at back of 8600.

    I just noticed I forgot to put ferrites on the rotor cable. I'll take care of that, but I doubt its the problem, as the drop out occurs even when I use my HF9v vertical which is a good 50' away from the rotor.
  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    I recently had an issue with QRO on &0 meters would cause my Internet to go out during TX and fiber gateway would reboot when back to receive. Mix 31 ferrites on Ethernet cables and wall wart (switching 12 v) for the gateway. I fixed it by swapping the fiber gateway (think modem) with a 12 volt 2.5 a linear wall wart. Evidently RF getting direct into the switcher wall wart for the fiber gateway.

    73 Dave wo2x

  • Mike Steventon
    Mike Steventon Member ✭✭✭

    If you are feeling rich try these in all ethernet lines connected; DX Engineering ISO-PLUS Ethernet RF Filters.

    I have them to cure the same problem. Now no more rf getting into pc.

    Go them a go!!!

    Mike

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    One trick that I have used to figure out the source of the RF ingress is to start disconnecting cables until the symptom disappears. That usually isolates the issue.

    I have been surprised at where it gets in, including cables that I already have ferrites on. I have a long cable that goes the length of my house that needed a mix 31 toroid with several turns through it, not the single bead that I originally had on there.

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