[RFI] Roomba RFI

[Leigh L Klotz, Jr.]

This is for the archives.

I tracked down a new noise in my house to a Roomba vacuum cleaner 
charger.  It was a periodic buzz/click about once per second, presumably 
when the micro in either the Roomba or the charger wakes up to sample 
the NiMH voltage.

The noise affected a low dipole but not other antennas further away.

I located it by the circuit-breaker test (off one at a time).

I eliminated the noise by putting 10 turns of the AC power cord on a 2.4 
inch diameter toroid I bought a while back.

I did not put anything on the DC side of the power brick.

73,
Leigh/WA5ZNU