[AMRadio] QRM fron Neighbor's Security System

Jim Wilhite w5jo at brightok.net
Thu Jan 21 21:49:47 EST 2010

Sometime in the recent past there was a ham in Houston, TX (I believe) 
who had interference that he traced to a neighbor who had two of those 
electric scooters, one for him and one for his wife.  The noise was on 
every night and the battery charge circuits put trash on the AC lines 
that tore up the amateur bands.

He contacted the neighbor and told him of the problem so the neighbor 
allowed him to install filters in the lines used to charge the 
batteries.  That fixed the problem, so the ham thought.  Evidently the 
scooter owners did not like the filters and removed them.  The ham tried 
for months to get the owners to reinstall the filters but they would 

The rest of the story is short.  The FCC enforcement group finally 
interceded and sent letters (more than one) telling the owners to put 
the filters back in place.  They ignored the letters and it cost them 
some fine, the amount I don't recall.  Sad deal for two people who 
refused to follow the rules.  But if you have an unintentional radiator 
then you can, after a process, get something done about it.

If you are an ARRL member, contact Ed Hare, W1RFI and get some help. 
That will shorten the wait.



----- Original Message ----- 

>I am not familiar with this particular system, but most X-10 equipment 
> the home's power lines for transmission. If you are both on the same
> transformer, you may be getting interference from your home's power 
> line. You
> may need some power line filtering. Depending on your gear, you may be
> subject  to Part 15 rules which basically say that your equipment must 
> accept
> various  forms of interference. Regardless, it is a sticky wicket.

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