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Old 09-25-2017, 08:57 AM   #1
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TV loses some stations when USB chargers in use

On several occasions we will lose a TV station or two whenever we plug in a phone or tablet into the in-wall USB chargers. It will cause that station to go from a good signal to bad and no picture. What's odd is other stations aren't affected at all by it. It doesn't matter where we are camping - there's usually one station that doesn't like the USB chargers when in use.

Anyone else have this problem or have ideas on how to fix it? Of course unplugging the devices fixes it but that defeats the purpose.
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Old 09-25-2017, 09:43 AM   #2
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That is very odd estesbubba. Only thing I can think of, and this is a stretch, is that the USB port(s) share the same power source as the OTA amplifier and is reducing power to the OTA amplifier which in turn reduces signal strength. Or, there is some sort of RF interference produced by the USB charging port.
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Old 09-25-2017, 10:28 AM   #3
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That happens to me when I am setting in my truck waiting on Momabear to do some shopping and playing with the tablets and cell phone etc.. Sometime when I plug in my charging cord into the truck 12V USB charge ports I get what is called RFI signal interference on my truck radio. I haven't noticed this on the HDTV in my POPUP trailer.

The one that produces the RFI the most is my large portable USB battery pack that is running two items - My Tablet and the cell phone charger...

You might just change locations where you are charging to see if it doesn't bother the HDTV signals.

I suspect this problem is more prevalent when using the OTA HDTV antenna verses the CABLE TV connection from a campground...

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Old 09-26-2017, 10:56 AM   #4
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You can get barrel magnets from Amazon. Place them over the charging circuit on the inside of the panel. this should help. I had the same problem with my LED reading spotlights knocking out my neighbors TV's. I talked with an electrical technician about it and that is what he told me to do and it worked great
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Old 09-26-2017, 08:41 PM   #5
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I can't solve your USB problem, but our TV loses stations whenever someone turns on the led ceiling lights under the antenna inside the camper. They come back when the lights are turned off.
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Old 09-27-2017, 05:15 AM   #6
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Small chargers often reduce 12v to the 5V needed for USB by pulsing the power on and off very rapidly (a gross oversimplification, but basically valid)
This pulsing can generate harmonics up in the radio frequencies, and the charging cord acts as an antenna, spreading the interference far and wide.
Some LEDs, especially dimmable onee, can do the same.

I think somebody already suggested a ferrite "slug" on the cable, or simply changing the position of charger and cable may help. Or even try another charger.. Different models may be better made

Ian, the "I used to be an engineer, but I got better" man from Scotland
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Old 09-27-2017, 05:18 AM   #7
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I have heard of some adding a inexpensive RF filter to their tv cable input to block the rf interference from LED's and other unknown sources of radio frequency.

https://www.channelmaster.com/TV_Ant..._p/cm-3201.htm

I miss Radio Shack. They had this stuff on the shelf just down the street.
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Old 09-27-2017, 12:57 PM   #8
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Quote:
Originally Posted by WeRJuliian View Post
I think somebody already suggested a ferrite "slug" on the cable, or simply changing the position of charger and cable may help. Or even try another charger.. Different models may be better made
Scotland
I would recommend putting the slug on the USB charging cable or the cable behind the wall going into the USB outlet?
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Old 10-07-2017, 07:48 AM   #9
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Originally Posted by estesbubba View Post
I would recommend putting the slug on the USB charging cable or the cable behind the wall going into the USB outlet?
On the charging cable, that's the "antenna"
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