|KPN Experia box internet modem|
So I disconnect that and fed my central earth point now through a ferrite ring to prevent my earth from radiating. It did help a tiny bit, internet did not disconnect immidiatly now but still after 5-10 seconds transmitting. So I made some interference precautions at the internet modem. Placed a netfilter between the power supply and net, although my shack is not physically connected so interference is almost not possible via electricity wires. Then I placed ferrite clamps on every wire at both sides. It didn't help anything at all! The only thing left was to disconnect cables one by one. Starting with the longest one a 10m CAT5e FTP cable to our TV. Without this cable I had no trouble at all, the internet did not disconnect. I plugged it in and had the trouble again but now after a while transmitting. So it definitely found the culprit. I immidiatly ordered a shielded CAT cable shown in the picture. This time as short as possible 7,5m. It actually was a little too short so I had to place the router modem elsewhere. I was afraid the WiFi signal would not reach the shack anymore now. But surprisingly the signal went up from good to very good. Anyway, I tested on 40m, 60m and 80m with a 80W PSK31 signal. Transmitting 3 times only give a few small hick ups at the TV. The internet connection was not lost, telephone and TV were ok. Hopefully the problem is solved now. When I have the horizontal loop up again in november I'll do more tests. For now at least I can work full output again.