Re: Radio Interference

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

Yes, it's possible.  Try a 12V battery to power the intercom to see if
you've still got hum.  Got a portable AM radio?  Should be able to zero on
the source pretty easily if you're not absolutely sure it's the intercom.

Probably the easiest way to start looking for a fix is to use ferrite split
beads.  Get 1/2" hole split beads and put one or more over the bundle of
cables coming out of the intercom wiring.

You can also try filtering the power supply with something like this:

http://www.ky-filters.com/ac.htm

--
Bobby G.

"Cooldude" <cahriad24@xxxxxxx> wrote in message
news:1151975192.956866.249860@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Recently installed a door intercom, now I have a distinct hum on AM
> radio that sounds like a motor boat. Power comes from an Altronix 12v
> DC power supply. Possible the power supply cable or door to intercom
> wiring is acting as an antenna and broadcasting hum from power supply?
>
> Thanks
>