Ahh well I still need a solution.
Tother half wants me to sell up as it's destroying her TV.

Phil - G7BZD

i had the same problem my bt hub was cutting out every time i would tx from the radio i tried ferrites and grounding etc still no good so as i did not have this problem a couple of years ago and are just back on the air i contacted bt online they said there was a fault and an engineer would come out well after testing we were only getting 8mb so he put a new box master socket 5c on now we are getting 16mb and no more tx from the radio cutting the broadband off

I am also facing the same issue, even with transmitting just 5 watts on FT8. I am running a half wave 40m end fed wire with the matching unit at the feed point on the top of the mast plus a 1:1 choke at the transceiver end.

My modem is in a network rack which is made of metal with a glass door so I would expect it to be fairly well shielded. The cabling from the BT faceplate is shielded cat6a (I work in IT networks, hence the overkill for home use!).

I have constructed a "whole shack mains filter" courtesy of GM3SEK.


I have also made a notch filter as per the below link:

https://community.ee.co.uk/t5/Broadband-Landline/Smart-Router-very-susceptible-to-radio-transmissions-amp-losing/td-p/1054210/page/5


I then grounded my transceiver with 3x copper earth rods spaces 4ft apart.

Finally, I added a ferrite core between the faceplate and the modem, albeit the cheap red iron powder one (perhaps this is of little to no use.

I have ordered FT240-31 and FT240-43 cores to try each of those, if neither work I am at a bit of a loss, grateful for any further tips.

Thanks