[RFI] elevator noise

[myles landstein]

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
>
>
>
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>
>
> thanks
>
>
>
>
> Myles N2EHG