[RFI] Taming a riding chair power supply.

[Gary Smith]

The built in charger on my father's powered chair failed and a OEM 
replacement is not available. It runs on two 12V deep cycle batteries 
in series. 

I found an aftermarket charger on fleabay that does the job but it is 
a RFI generator which sweeps as it charges. The interference is 
fairly broadbanded but worse at the lower end of the HF spectrum. It 
does sense when the batteries are topped off and the RFI lessens at 
this point but to remove the interference, the charger must be 
unplugged.

My father wants me to buy a Radio Shack line filter but I thought it 
would be best to ask here for suggestions.

Idears?

Thanks

Gary
KA1J