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I have an  Arris Surfboard SBG6700-AC  cable modem router.   I like to listen to AM talk shows when I am working  at my computer.  When I have my Arris turned on it creates heavy static noise on any AM radio playing in the house. On the other hand,  when I  try FM it plays without static.  I really need static free AM radio. Is there some type of adjustment I can do to my Arris?  Thank you.

many devices can cause electrical interference. it probably is the modem/router device. 

https://www.rsm.govt.nz/business-individuals/interference/radio-interference/sounds-like/#:~:text=Electrical%20interference&text=On%20AM%20and%20FM%20radios,many%20hundreds%20of%20metres%20away.

 

You could always try a frequency filter for the radio’s power cable.