My neighbor's kid had one of those scooters. I bought them a
cheap outdoor timer so they could charge it up in the middle
of the night. After a few weeks, the scooter broke down, and
there was no local repair support, so the problem went away.
I also purchased one of the chargers on EBay, put it in a
metal box with filters on the input and output, and it still
made too much noise. Those chargers are definitely bad news.
Dave Hachadorian, K6LL
Yuma, AZ
----- Original Message -----
From: "Jim, W4ATK" <w4atk@bellsouth.net>
To: <w9ac@arrl.net>; <rfi@contesting.com>
Sent: Friday, November 21, 2008 11:57 AM
Subject: [RFI] RFI
> Paul,
> This type of noise is characteristic of a Chinese made
> switching
> battery charger. I will just bet one of the neighborhood
> kids has a
> Chinese made electric scooter. The charger is 36V and
> very bad news.
> The frequency will change as the battery charges, but will
> always be a
> consistent 56KHz. A lot of people will confuse this with
> the refresh
> rate on some monitors. I can supply photos of the
> offending charger and
> scooter if you would like. I have one two doors up the
> street from me.
> ICE makes a filter than will go a long way toward
> clearing it up,
> but it is expensive. I have worked out an arrangement with
> the owners
> that stipulates that the charger will only be used when
> there is
> expected use of the scooter. Alas, they forget and leave
> it plugged up
> and eventually I will have to call.
> If I can be of further assistance, drop me an email.
>
> 73s Jim, W4ATK
>
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