Sounds like a job for the MFJ nuller. The good news being its a point source
and should be easily handled. It may cost you several months of frustration for
no good outcome otherwise but perhaps it's worth a try if there is a simple
bonding issue there.
Sent from my iPad
> On Dec 14, 2014, at 01:08, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
>> On Sat,12/13/2014 5:35 PM, Don Kirk wrote:
>> Now going back to the contractor that installed the equipment in an attempt
>> to better understand the hardware in the unit
>
> That smells like a Variable Speed Drive, the heart of which is a switching
> power supply that generates pulses in the 10 kHz range, the width of which
> are varied to control the speed of the motor. Lots to go wrong here --
> switching power supply, square pulses of big current running a distance
> between the controller and the motor, often with supply and return conductors
> widely separated from each other, and with controller and motor widely
> separated, so the current flows in a large loop. Can you say train wreck?
>
> 73, Jim K9YC
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|