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Old 31-12-2013, 04:40   #1
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Electrical situation

I'm looking for any thoughts on where I should begin to source the possible cause of this situation.

When we turn on our TV there are a couple of channels which we lose the signal to when either the back head is flushed or the over head light in the forward V berth is turned on. We restore the channel frequency when we turn off the TV and turn it back on. My thoughts are it might lie in the ground circuits.
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Old 31-12-2013, 11:47   #2
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Re: Electrical situation

1) monitor the 12v at the back of the TV when the disrupting events occur; if the voltage dips or droops you may have a problem connection somewhere.

2) it's more likely that the back head and/or the fwd vee-berth light are causing interference to the TV. There are various filtering approaches that could be applied to the offending devices, once you identify them. A better antenna on the TV may help, too.
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Old 31-12-2013, 11:54   #3
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Re: Electrical situation

Its motor interference with the head, and I would bet the light is LED which also interferes as there is a switching regulator in them which runs at or near the tv vhf frequencies. The digital tuner stops trying after a while, leave it long enough on a channel or switch back and forth between channels it will re-tune without turning it off and on.

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Old 31-12-2013, 11:57   #4
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Re: Electrical situation

The TV is a/c source not d/c, but the TV and lights all seem to share the inverter charger circuits, as when the a/c supply is off the inverter system takes over.
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Old 31-12-2013, 12:03   #5
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Re: Electrical situation

The frequency suggestion sounds like a good thought will try installing some ferrets
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Old 31-12-2013, 12:38   #6
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Re: Electrical situation

ferrets are not going to do much as the interference is RF and is broadcast, a capacitor and diode across the motor might help as it will suppress the brush arcing. the light .. not much you can do, turn it off and watch in the dark?.

I have had the same problem up until the near lightning strike took out the tuner altogether, still works as a monitor so we watch DVD,s or web content instead.

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Old 31-12-2013, 12:42   #7
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Re: Electrical situation

Thanks for the info will give it a shot
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Old 31-12-2013, 12:51   #8
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Re: Electrical situation

Ferrets will only help chew up the wires and need to go to the vet, afterwards. Try ferrites instead. Besides, they're cheaper than the furry critters.
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Old 31-12-2013, 12:59   #9
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Re: Electrical situation

Wow ! In the olde days before electricity we had to watch TV by candle light ..
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Old 31-12-2013, 13:45   #10
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Re: Electrical situation

Correct ferrites, they don't eat as much either. And I use to walk 5 miles in the snow to school too.
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Old 04-01-2014, 04:38   #11
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Re: Electrical situation

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Correct ferrites, they don't eat as much either. And I use to walk 5 miles in the snow to school too.
AND it was uphill BOTH ways!
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