[RFI] Elimination of Treadmill RFI on 160 meters

[Michael Zolno]

Great work Don. 

It's always interesting to see what others have done to address issues as this. Thanks for sharing.

All my very best,

Mike WH6YH

Sent from my iPad
> 
> Treadmill combination filter update.
> 
> Today I replaced the 10 amp commercial filter with the 20 amp version of
> the filter, and the results are similar.  Below are a few measurements on
> 160 meters and 80 meters showing how effective the combination of the two
> filters are (14 turn toroid choke, and commercial filter model 20DRGG5 made
> by Delta) in reducing my treadmill RFI.
> 
> *1.8068 Mhz*
> No Filters : 19db over S9
> With Filters : S7 which is my noise floor
> 
> *1.8291 Mhz*
> No Filters : 15db over S9
> With Filters : S7 which is my noise floor
> 
> *3.5250 Mhz*
> No Filters : 28db over S9
> With Filters : S6 which is my noise floor
> 
> 
> *3.5475 Mhz*
> No Filters : 25db over S9
> With Filters : S6 which is my noise floor
> 
> The 3.5250 Mhz readings indicate the filter is knocking the signal down at
> least 46db (and probably more).
> 
> 73,
> Don (wd8dsb)