[RFI] Pulsating RFI on 75b meters

["van fair" <giw@bellsouth.net>]

I have an s8 pulsating noise on 75 meters exactly every 53 Khz. It is strongest 
on 3754 and occurs every 53  Khz up and down the band. It is weak by the time 
you get down to 3595 and by the time you get up to 3966. 

Anyone ever hear this type of RFI  that is every 53 KHZ.  any ideas. ??? thanks 
Van W4GIW
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