Data from another treadmill RFI success story. A few days ago Lionel (N5LB) added filters to his treadmill based on what I had done to eliminate RFI from my wife's treadmill, and below are his very successful results.
---------------------------- Don I want to tell you my results with the treadmill and the delta filter. Before the filter: 160m - 91 dbm 80m -77 dbm 40m -97 dbm 20m -93 dbm 15m -97 dbm 12m -110 dbm 10m nil After the Delta install 160, 80, 40, 20 m below the mds at - 131 dbm 15, 12m -110 dbm After adding a FT240-61 with 7 turns of #12 stranded in the line side of the Delta. 160 - 10m not measurable, mds is ~ -131dbm. Not visible on Flex 5000 waterfall. All of the dbm readings are from the Flex 5000 meter. S7 = ~ -90 dbm so the RFI was really bad. So like you case I needed additional filtering. For me it was higher in frequency so the Delta attenuation must drop off above 20m. I was able to fit the Delta and the toroid inside of the treadmill motor and control housing making for a neat install. Thanks for the excellent suggestions. I bought the Delta from Digikey and had it 36 hours later, incredible service. Lionel ---------------------------------------- Note that Lionel used the same Delta Filter that I used (model : 20DRGG5). He used an FT240-61 core which he had on hand with 7 turns of the Hot and Neutral wires passing through the core (ground wire die not pass through his core) whereas I used 14 turns of the power cord on a 2.4" OD Fair-Rite #31 mix toroid core (Neutral, Hot, and Ground wires passing through the core). Just FYI, and glad to hear others are having success using filters on their treadmill similar to what I used which have provided excellent results. 73, Don (wd8dsb) _________________ Topband Reflector Archives - http://www.contesting.com/_topband