I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
One avenue of attack would be to contact the manufacturer. It's an electrical device. It should have been subject to part 15 certification. The RFI would seem to be an indicator that it's not compliant. The ARRL can probably provide some assistance as well. I know they have been helpful with the issue of RFI from grow lights here in Washington.
73, Grant KB7WSD
On Sat, May 22, 2021 at 12:25 PM John Geiger af5cc2@gmail.com wrote:
I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
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Dishwashers, and most ‘appliances’ are exempt from Part 15. You can see a list here: https://www.compliancegate.com/fcc-part-15-product-list/
There has been a great deal of discussion on the RFI email reflector about this fact. Some manufacturers are known to be quite helpful. Some other manufacturers are very quick to say – we are exempt leave us alone…
Ed Hare and the ARRL are very responsive, and have good relationships with many of the manufacturers.
rfi@contesting.commailto:rfi@contesting.com is another good resource. http://lists.contesting.com/mailman/listinfo/rfi
73, Joe kk0sd
From: gfhopper@gmail.com gfhopper@gmail.com On Behalf Of Grant Hopper Sent: Saturday, May 22, 2021 3:02 PM To: John Geiger af5cc2@gmail.com Cc: AMSAT amsat-bb@amsat.org Subject: [AMSAT-BB] Re: Dishwasher RFI on 2 meters
One avenue of attack would be to contact the manufacturer. It's an electrical device. It should have been subject to part 15 certification. The RFI would seem to be an indicator that it's not compliant. The ARRL can probably provide some assistance as well. I know they have been helpful with the issue of RFI from grow lights here in Washington. 73, Grant KB7WSD
On Sat, May 22, 2021 at 12:25 PM John Geiger <af5cc2@gmail.commailto:af5cc2@gmail.com> wrote: I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
-----------------------------------------------------------
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I like the Tripp-Lite ISOBLOK2-0, $32 at Amazon. I have opened it up, and the 8 and 10 outlet versions, and verified that there is a real RF filter in there.
Thanks
Bruce
On Sat, May 22, 2021, 4:02 PM Gary gary_mayfield@hotmail.com wrote:
Dishwashers, and most ‘appliances’ are exempt from Part 15. You can see a list here:
https://www.compliancegate.com/fcc-part-15-product-list/
There has been a great deal of discussion on the RFI email reflector about this fact. Some manufacturers are known to be quite helpful. Some other manufacturers are very quick to say – we are exempt leave us alone…
Ed Hare and the ARRL are very responsive, and have good relationships with many of the manufacturers.
rfi@contesting.com is another good resource.
http://lists.contesting.com/mailman/listinfo/rfi
73,
Joe kk0sd
*From:* gfhopper@gmail.com gfhopper@gmail.com *On Behalf Of *Grant Hopper *Sent:* Saturday, May 22, 2021 3:02 PM *To:* John Geiger af5cc2@gmail.com *Cc:* AMSAT amsat-bb@amsat.org *Subject:* [AMSAT-BB] Re: Dishwasher RFI on 2 meters
One avenue of attack would be to contact the manufacturer. It's an electrical device. It should have been subject to part 15 certification. The RFI would seem to be an indicator that it's not compliant. The ARRL can probably provide some assistance as well. I know they have been helpful with the issue of RFI from grow lights here in Washington.
73,
Grant
KB7WSD
On Sat, May 22, 2021 at 12:25 PM John Geiger af5cc2@gmail.com wrote:
I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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We have a similar dishwasher -- Model #GFID2476SF0A -- and I've detected no noise from it. Perhaps you have a defective unit? -- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd ----------------------------------------------- "Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Sat, May 22, 2021 at 2:25 PM John Geiger af5cc2@gmail.com wrote:
I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
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John, Just a quick thought. Check the grounding at the DW. Make sure youhave almost ZERO Ohms reading between the Neutral and GroundAT the power feed at the DW. GL, Bob K8BL
On Saturday, May 22, 2021, 04:25:28 PM EDT, Mark Johns, K0JM k0jm.mark@gmail.com wrote:
We have a similar dishwasher -- Model #GFID2476SF0A -- and I've detected no noise from it. Perhaps you have a defective unit?-- Mark D. Johns, KØJM AMSAT Ambassador & News Service Editor Brooklyn Park, MN USA EN35hd -----------------------------------------------"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain
On Sat, May 22, 2021 at 2:25 PM John Geiger af5cc2@gmail.com wrote:
I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC -----------------------------------------------------------
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-----------------------------------------------------------
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I doubt a line cord torrid will do anything. At 2 meters, a quarter wavelength is 19 inches and so even if the torroid was 100% effective at suppressing all energy, if it is more than a few inches from the internal circuit board that is generating the RFI, then it will accomplish almost nothing. IE, if it is 19" away from the board, then the 19" leading up to it is a perfect 1/4 wave antenna for the RFI.
The RFI needs to be suppressed at its souice, on the board. And good luck with that!
Bob, WB4APR
On Sat, May 22, 2021 at 3:25 PM John Geiger af5cc2@gmail.com wrote:
I have been having some noise on 2 meters, making it harder to hear the satellites in certain directions, and I have finally traced it down to the new dishwasher we bought a few months ago. It is a Frigidaire Galley Model number FGID2468UF1A (in case you want to avoid this model).
I tried wrapping the power cord, which is a flat, about an inch wide 3 pronged AC cord through a rectangle torrid I have on hand that would split in half for easier access. I could fit 2 turns of the cord through it. That didn't make a difference. I have a larger ring torrid but the plug on the cord is a little too large to fit through it. I am sure I could get a larger diameter torrid if I thought it would work.
So, what is the best plan of attack on the RFI-other than just unplugging the dishwasher when I am not using it. I can probably only get 2 or 3 turns max through a ring torrid due to the length of the cord. Is this the best solution for RFI, or what other methods can I try?
73 John AF5CC
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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participants (7)
-
Bob Liddy (K8BL) -
Bruce Perens -
Gary -
Grant Hopper -
John Geiger -
Mark Johns, K0JM -
Robert Bruninga