This great case study from a VK amateur….
I have a Telstra NBN modem, used for a FTTN service. It is installed on a shelf in the garage
My 40m dipole runs across the garage – the end is about 7m away from the modem. Whenever I transmitted, RF would cause the modem to lose synch, and it needed to be rebooted to get the service back….losing Netflix is not good for domestic harmony, let me tell you!
I installed 3 snap on ferrites on the input phone line – I managed to get three turns on two, and two turns on one. I also put two turns on a snap on ferrite on the DC input.
I also used ring ferrites for the two Cat 6 lines to/from the modem – three turns on each.
Probably overkill, but it works a treat – 100W of CW key down, and no problems.
Domestic harmony restored.
Thank-you QRM Guru! Photos of the before and after below….
(Ed: visit this page to understand more about ferrites and noise suppression)
And you can buy QRM Kill Kits with a selection of ferrites from our online store here.