On Sep 27, 2009, at 10:07 AM, myles landstein wrote:
> hi
>
> Was wondering if anyone might have some suggestions to fix or
> reduce the type of noise I am getting...
>
>
> About a year ago my building upgraded the elevators, the new
> system was installed pretty good.
>
> Metal cabinets (vent holes) all metal conduit. short run to the
> motors. Good electrical grounds
>
> I get broadband spread noise from 1-30mhz. the noise just sounds
> like normal noise level background noise only S9+
> there is no noise when the elevators are still.
>
> using my tester I find no noise anyplace except coming from the
> Magnatek600 motor controller in the cabinet
>
> Manufacture says it's not FCC type accepted because it's
> Canadian accepted not sure if that makes sense and they didn't
> really offer any help
>
> it really throws out RF!! moving to about 30ft takes me to
> around S6 -- noise is omnidirectional
>
> The elevator put some big filters on the incoming ac line but
> it didn't help (noise wasn't coming from wiring)
>
>
> I thought about trying to shield the cabinet it's metal but not
> RF tight might be a logistics problem and the unit needs
> to vent a bit of heat
>
>
> just wondering if anyone might have some ideas that could
> 'filter' or shield/reduce the noise specifically in the
> elevator room
>
>
>
>
>
>
>
>
> thanks
>
>
>
>
> Myles N2EHG
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