I had a similar problem in 2005 when noise from a 2kW Honda got into my RV on FD. Lacking any ferrites etc I borrowed a plastic "milk bottle box" and wound about 30 feet of extension cord around it., which worked well as a temporary fix.

Cortland
ka5s

On 8/7/2016 2:21 PM, elecraft-requ...@mailman.qth.net wrote:
I have an inverter generator producing S9 noise on 3.5Mhz, and S7 noise on 
7Mhz. Higher frequencies are clear.
If I were to use a trifilar wound choke on the lead from the generator, what 
would be the best mix...43, 77 or?....

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