True. But don’t dismiss the benefits out of hand. Variable speed pool pumps
save us several hundred dollars per month at our rental property and contest
station in VP5. $45 RF filters from Schaffner on each pump reduced the noise
from a problem to undetectable on any amateur band. A great trade off in my
opinion and I would suspect applicable to most variable speed drives. Ham radio
can coexist with energy saving.
73,
Jim K4QPL/ VP5M
Sent from my iPhone
> On Apr 30, 2019, at 11:46 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
>> On 4/30/2019 4:38 PM, Paul wrote:
>> I might call on the RFI audience to share their experience with regular
>> electric motors versus the newer DC motors. I am drawn to the energy
>> efficiency of the latter but fear the control electronics may be RFI noisy
>> as are our baneful “wall worts”.
>>
>> So, anyone have an opinion ?
>
> Not an opinion -- they have no place in scientific discussions. :)
>
> It is a FACT that the the electronic controllers for most variable speed
> motors are quite noisy, for the same reason that the switch-mode power
> supplies in today's wall warts are noisy -- poor design and construction that
> fails to prevent radiation and conduction of RF noise. In other words, best
> to avoid them.
>
> 73, Jim K9YC
>
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