In all RFI cases that I have tracked down to VFDs (variable frequency /
variable speed drives), the input line filter recommended by the drive
manufacturer for EMC compliance had not been installed. Installing the
recommended input line filter or a similar input line filter has always
made a huge difference if not total elimination of the problem. On a tread
mill case I had to use both an input line filter as well as toroid core for
complete ellimanition of the RFI.
Just FYI,
Don (wd8dsb)
On Saturday, June 30, 2018, jimk8mr--- via RFI <rfi@contesting.com> wrote:
>
> At my Florida condo QTH I found a lot of noise being generated by the pool
> pumps about 200 feet from my indoor antenna. The inverter responsible is
> from CES Water Quality in Jupiter, FL. The noise is broadband, so it's not
> going to be helped by changing speeds. I've not tried any fixes, partly
> because going through condo management is a pain, and because there are
> some other closer sources (low voltage lamp power supplies) that are more
> serious. These pumps (which are for a fairly large pool) and on 50 amp
> circuits, with #8 wire, so it will take some serious toroids on those power
> leads.
>
>
>
> One other thing which you might consider with any pumps is twisting the
> power wiring from the controller to the pumps.
>
>
>
>
> 73 - Jim K8MR
>
>
>
>
>
>
>
> -----Original Message-----
> From: James Jordan <k4qpl2@gmail.com>
> To: rfi <rfi@contesting.com>
> Sent: Sat, Jun 30, 2018 9:08 pm
> Subject: [RFI] RFI from variable speed swimming pool pumps
>
> I’ve heard variable speed HVAC units sometimes cause RFI. Does anyone
> haveexperience or knowledge about variable speed pool pumps? Specific model
> I’mlooking at is Energy efficient Pentair VS Intelliflow 1.5HP equivalent
> toreplace a power hog single speed at our VP5 property, but I don’t want
> toend up with a noise problem.My antennas are about 60' from the pump
> location and the SteppIR aims inits direction.Because the various speeds
> are user adjustable, would varying the speedchange the position of any
> spurs to a less critical frequency? Other ideas?73,Jim, K4QPL;
> VP5M_______________________________________________RFI mailing listRFI
> @contesting.comhttp://lists.contesting.com/mailman/listinfo/rfi
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