Hi Mac,
I had to find the data sheet for the ACP unit to figure out that it came
with a 2 foot power-cord and sure enough Mike (W9RE) received a power cord
with the unit. The descriptions by various sellers on this product as well
as many other products certainly lacks at times.
Don (wd8dsb)
On Wed, Oct 13, 2021 at 3:13 PM D C _Mac_ Macdonald <k2gkk@hotmail.com>
wrote:
> I did not see anything indicating that it
> came with a short cord to connect the
> device to the wall outlet.
>
> Thanks for the explanation.
>
> My only known RFI problem is with my
> multi-speed A/C system that puts birdies
> on 20 meters. That may be greatly lessened
> when I get a beam up on a 40' tower 30'
> from the house and am not using a non-
> resonant ladder line fed dipole over the
> roof for all bands.
>
> 73 - Mac, K2GKK/5
> Since 30 Nov 1953
> Oklahoma City, OK
> USAF (Retired) 61-81
> FAA (Retired) 94-10
>
> ------------------------------
> *From:* Don Kirk <wd8dsb@gmail.com>
> *Sent:* Wednesday, October 13, 2021 14:04
> *To:* D C _Mac_ Macdonald <k2gkk@hotmail.com>
> *Cc:* RFI <rfi@contesting.com>
> *Subject:* Re: [RFI] RFI LG Refrig Corcom filter and #31 core
>
> Hi Mac,
>
> The APC AV C Type 2 Outlet Wall Mount Power Filter has two built in
> receptacles (female jacks) on one end and on the opposite end is a jack for
> a typical line cord and it actually comes with a 2 foot line cord that
> plugs into this jack but you can easily replace the line cord if you need a
> different length.
>
> It is designed so you can hang it on a wall (wall mount) but this has
> nothing to with existing house receptacle other then needing to plug the
> line cord from the power filter into the house receptacle.
>
> Don wd8dsb
>
> On Wed, Oct 13, 2021 at 2:33 PM D C _Mac_ Macdonald <k2gkk@hotmail.com>
> wrote:
>
> What "power cord?" Every APC C2 I found with
> Google is mounted *ON* the AC wall outlet.
>
> 73 - Mac, K2GKK/5
> Since 30 Nov 1953
> Oklahoma City, OK
> USAF (Retired) 61-81
> FAA (Retired) 94-10
>
> ------------------------------
> *From:* RFI <rfi-bounces+k2gkk=hotmail.com@contesting.com> on behalf of
> Don Kirk <wd8dsb@gmail.com>
> *Sent:* Tuesday, October 12, 2021 19:02
> *To:* RFI <rfi@contesting.com>
> *Subject:* Re: [RFI] RFI LG Refrig Corcom filter and #31 core
>
> Here is a quick followup regarding the RFI at W9RE on 10 meters that we
> tracked down to his neighbors refrigerator a few weeks ago. We previously
> were able to eliminate the RFI using a commercial power line filter in line
> with a choke based on Jims (K9YC) design in which 12 turns of the power
> cord were wound on an FT240-31 toroid core. While this combination worked,
> we were looking for a plug and play commercial power line filter to replace
> the Delta Electronics or Corcom filters that worked but were not plug and
> play (they did not have built in outlet receptacles, etc.).
>
> Mike purchased an APC C2 power line filter that had 2 built in outlets as
> well as built in RFI/EMI filtering with a spec of 50dB from 100 kHz to 10
> MHz (can't find the specs above 10 MHz or detailed specs regarding
> differential mode versus common mode suppression).
>
> Mike then wound 4 turns of the APC C2 power cord on an FT240-31 toroid core
> based on recommendations from Jim (K9YC) for use on 10 meters.
>
> Mike then gave the APC C2 filter with toroid core on the power cord as
> mentioned above to his neighbor, and today Mikes neighbor tested this new
> filter combination on his refrigerator while Mike listened to 10 meters
> from his shack, and the new filter combination successfully eliminates the
> RFI on 10 meters that Mike was encountering from his neighbors
> refrigerator.
>
> The APC C2 filter is built like a tank (weighs approximately 2 pounds), and
> we have no idea what the filter circuit inside it really is, but we are
> satisfied with the results and the neighbor appears happy using this plug
> and play system.
>
> Just FYI,
> Don (wd8dsb)
>
> On Wed, Sep 29, 2021 at 7:41 PM Don Kirk <wd8dsb@gmail.com> wrote:
>
> > Hi Jim,
> >
> > For the records, we actually tried two different commercial filters on
> the
> > fridge along with the common mode choke. Both required the common mode
> > choke in line with it to successfully eliminate the RFI at Mikes, and as
> > mentioned the common mode choke alone was not adequate. My common mode
> > choke used the FT240-31 core with 14 turns and the turns are tightly
> wound
> > one next to the other in proper order.
> >
> > The case of the commercial filters were not mounted directly to the case
> > of the fridge, but the ground wire from the fridge power cord was
> connected
> > to the case of the commercial line filter, and the case of the commercial
> > filter then had a wire connected to it going out toward the wall outlet
> > ground via the power cord, so the ground wire from the fridge was a
> > continuous connection to the commercial filter case and then from the
> > commercial filter case to toward outlet ground. All power cords used
> were
> > 3 wire (line, neutral, and ground).
> >
> > The two commercial filters we tried were the Delta Electronics model
> > 20DRGG5 (which is mine) and an old Corcom filter F2212 (which is Mikes,
> and
> > I can't find any documentation on the F2212 filter). We pretty much had
> > identical results regardless of which one of the 2 commercial filters we
> > used in conjunction with or without the FT-240-31 choke. Commercial
> filter
> > alone was not adequate, FT-240-31 common mode choke alone was not
> adequate,
> > but both in series work great. This is the same situation with my
> > treadmill, and I also don't have the case of the commercial filter
> mounted
> > to the case of the treadmill. Mounting filter case to the case/frame of
> a
> > homeowners device starts getting very intrusive, and I won't take on that
> > responsibility/liability. As Mike mentioned we need to find something
> > already packaged with incoming and outgoing outlets/power cords for use
> in
> > someones home in order to avoid liability issues.
> >
> > Just FYI, and 73.
> > Don (wd8dsb)
> >
> > On Wed, Sep 29, 2021 at 6:24 PM Jim Brown <jim@audiosystemsgroup.com>
> > wrote:
> >
> >> Thanks Don. How is the Corcom installed? For it to work well, it needs
> >> a VERY short bond to the chassis of the fridge. I would put the choke on
> >> the line side of the filter.
> >>
> >> On what bands was there noise?
> >>
> >> About the choke -- in doing the lab work for the 2018 Cookbook, I
> >> learned that turns wound around the core that are out of order within
> >> can cancel, reducing the effectiveness of the choke. Winding in order is
> >> relatively easy with toroids, but can be very tricky with clamp-ons.
> >>
> >> 73, Jim
> >>
> >> On 9/29/2021 1:32 PM, Don Kirk wrote:
> >> > Hi Jim,
> >> >
> >> > Once again the toroid core choke did not eliminate the RFI on its own.
> >> > We tried the K9YC toroid choke by itself and it did not eliminate the
> >> > RFI, we tried the corcom filter by itself and it did not eliminate the
> >> > RFI. It was only when we used both filters in series that Mike
> >> reported
> >> > the RFI was gone. I also tried the toroid choke before and then after
> >> > the corcom filter with identical results on Mike’s RFI.
> >> >
> >> > This is not the first time that I have had to use both filters to
> >> > eliminate RFI. The first time was on my wife’s treadmill. It really
> >> is
> >> > an interesting phenomena. I suspect we would notice some components
> of
> >> > the RFI disappear if looking at it with my SDR receiver or spectrum
> >> > analyzer when using each filter on its own, but the bottom line is
> that
> >> > both filters were required for Mike ti noice the RFI disappear.
> >> >
> >> > Just FYI,
> >> >
> >> > Don wd8dsb
> >> >
> >> > On Wed, Sep 29, 2021 at 3:50 PM Jim Brown <jim@audiosystemsgroup.com
> >> > <mailto:jim@audiosystemsgroup.com <jim@audiosystemsgroup.com>>>
> wrote:
> >> >
> >> > On 9/29/2021 12:10 PM, Mike Wetzel wrote:
> >> > > My neighbor's LG refrigerator is radiating RFI on 28MHz and Don
> >> > (WD8DSB)
> >> > > temporarily hooked up a Corcom filter and a cord wrapped around
> >> a #31
> >> > > torroid core that eliminated the interference.
> >> >
> >> > I'd bet that the turns around the toroid were doing all the work.
> >> Noise
> >> > is most often on the green wire, which is a chassis-to=chassis
> >> > connection on the filter.
> >> >
> >> > 73, Jim K9YC
> >> > _______________________________________________
> >> > RFI mailing list
> >> > RFI@contesting.com <mailto:RFI@contesting.com
> <RFI@contesting.com>>
> >> >
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