We have a triple light switch by the door- 1 switches on the 2 outside lights and the other 2 are for internal lights. All lights have LED globes. But last night when we turned on the outside lights we lost the TV reception as did the 5th wheeler next door. Tried it again tonight and it happens every time the outside lights are switched on - turn the light off and TV reception returns.
This has never happened before - anybody got any clues please
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Jenny and Barry
2009 Roma Elegance / 2013 Colorado. Permanent travellers 2011-2015 now just travel for 4-6 mths
When you say it has been OK for a couple of years, were you parked in the same location with same antenna orientation as you are now.
If you are in a different location the tv signal from the transmitter may be low so that the radiated interference from the LEDs may overwhelm the TV signal.
In a higher TV signal location the LED interference may be less of a problem.
Pretty obvious that it is a radiated interference problem from the leds with a weak tv signal. try repositioning /redirecting the tv areal ,if possible .
Pretty obvious that it is a radiated interference problem from the leds with a weak tv signal. try repositioning /redirecting the tv areal ,if possible .
Why do you suggest it's radiated rather than conducted?
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
Pretty obvious that it is a radiated interference problem from the leds with a weak tv signal. try repositioning /redirecting the tv areal ,if possible .
Why do you suggest it's radiated rather than conducted?
From this" as did the fifth wheeller next door"
Unlikely that it would be line conducted interference all that way back through the 240V wiring
When you say it has been OK for a couple of years, were you parked in the same location with same antenna orientation as you are now.
If you are in a different location the tv signal from the transmitter may be low so that the radiated interference from the LEDs may overwhelm the TV signal. In a higher TV signal location the LED interference may be less of a problem.
Ken
hopefully this is the answer. The TV reception was poor in this location when we set up on Friday. Will try it out when we get home tomorrow as we have not had problems when parked at home.
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Jenny and Barry
2009 Roma Elegance / 2013 Colorado. Permanent travellers 2011-2015 now just travel for 4-6 mths
Pretty obvious that it is a radiated interference problem from the leds with a weak tv signal. try repositioning /redirecting the tv areal ,if possible .
Why do you suggest it's radiated rather than conducted?
From this" as did the fifth wheeller next door"
Unlikely that it would be line conducted interference all that way back through the 240V wiring
It's quite likely it would.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
We have a triple light switch by the door- 1 switches on the 2 outside lights and the other 2 are for internal lights. All lights have LED globes. But last night when we turned on the outside lights we lost the TV reception as did the 5th wheeler next door. Tried it again tonight and it happens every time the outside lights are switched on - turn the light off and TV reception returns.
This has never happened before - anybody got any clues please
If it is affecting the van next door it certainly NOT conducted.
You did not say if you lost all the channels or just the one you prefer to watch. Where were you at the time and what channels were affected?
The switched regulator in the globes is likely to produce a range of rough signals and not necessarily an across the spectrum white noise. It is possible you have not been in areas where the current channels being affected now were being used.
Do you have a spare globe you can swap for the one in use? If so give it a try, the replacement may interfere with different frequency signals. If so you may have to swap the globes as you travel if you can not find a quiet one.
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PeterD Nissan Navara D23 diesel auto, Spaceland pop-top Retired radio and electronics technician. NSW Central Coast.
PeterD wrote: If it is affecting the van next door it certainly NOT conducted.
Perhaps you will provide a technical rationale for your certainty?
Perhaps you could explain how interference in a 12 V system in one van can conduct to the next van. It will not conduct back past the battery and battery charger.
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PeterD Nissan Navara D23 diesel auto, Spaceland pop-top Retired radio and electronics technician. NSW Central Coast.
PeterD wrote: If it is affecting the van next door it certainly NOT conducted.
Perhaps you will provide a technical rationale for your certainty?
Perhaps you could explain how interference in a 12 V system in one van can conduct to the next van. It will not conduct back past the battery and battery charger.
Via the caravan parks earthing system is only one possible route.
Conducted interference can follow amazingly convoluted and seemingly isolated routes.
PeterD wrote: If it is affecting the van next door it certainly NOT conducted.
Perhaps you will provide a technical rationale for your certainty?
Perhaps you could explain how interference in a 12 V system in one van can conduct to the next van. It will not conduct back past the battery and battery charger.
Via the caravan parks earthing system is only one possible route.
Conducted interference can follow amazingly convoluted and seemingly isolated routes.
It may conduct that far at audio or AM radio frequencies but not TV frequencies.
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PeterD Nissan Navara D23 diesel auto, Spaceland pop-top Retired radio and electronics technician. NSW Central Coast.
PeterD wrote: If it is affecting the van next door it certainly NOT conducted.
Perhaps you will provide a technical rationale for your certainty?
Perhaps you could explain how interference in a 12 V system in one van can conduct to the next van. It will not conduct back past the battery and battery charger.
I certainly will.
We are discussing frequencies in the hundreds of megahertz region and they do not behave in the same way as the low frequencies you may be more familiar with. Parasitic effects have a far greater impact at such frequencies and a battery simply looks like a capacitor with built in transmission lines at 200MHz or the like.
For the past 25+ years I have been designing electronics systems which are required to comply with both emissions and immunity EMC standards and for the past six years I have specialised in EMC consulting and if I have learned nothing else over that time I have learned never to say "It can't do that" with EMC it's is far, far too complicated in its behaviour and will find coupling paths you never dreamt of.
In this case I suspect the issue was radiated but *never* assume with EMC.
__________________
"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
We are discussing frequencies in the hundreds of megahertz region and they do not behave in the same way as the low frequencies you may be more familiar with. Parasitic effects have a far greater impact at such frequencies and a battery simply looks like a capacitor with built in transmission lines at 200MHz or the like.
For the past 25+ years I have been designing electronics systems which are required to comply with both emissions and immunity EMC standards and for the past six years I have specialised in EMC consulting and if I have learned nothing else over that time I have learned never to say "It can't do that" with EMC it's is far, far too complicated in its behaviour and will find coupling paths you never dreamt of.
In this case I suspect the issue was radiated but *never* assume with EMC.
And what:
[a]does a capacitor do very well@ very high frequencies?
what does any inductance even self inductance in the cable do at very high frequencies?? especially any form of coil or iron ......Are you suggesting that such could get back through a long run of cable two battery chargers & @ least two batteries all of which would either act as chokes or bypass capacitors
-- Edited by oldtrack123 on Tuesday 11th of December 2018 04:45:54 PM
I once had a switch affecting an AM radio. It turned out to be build up of carbon from arcing in the switch which gave a slightly poor contact. I was a really old light switch. Got in a new switch & the problem was fixed.
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Procrastination, mankind's greatest labour saving device!
50L custom fuel rack 6x20W 100/20mppt 4x26Ah gel 28L super insulated fridge TPMS 3 ARB compressors heatsink fan cooled 4L tank aftercooler Air/water OCD cleaning 4 stage car acoustic insulation.
We are discussing frequencies in the hundreds of megahertz region and they do not behave in the same way as the low frequencies you may be more familiar with. Parasitic effects have a far greater impact at such frequencies and a battery simply looks like a capacitor with built in transmission lines at 200MHz or the like.
For the past 25+ years I have been designing electronics systems which are required to comply with both emissions and immunity EMC standards and for the past six years I have specialised in EMC consulting and if I have learned nothing else over that time I have learned never to say "It can't do that" with EMC it's is far, far too complicated in its behaviour and will find coupling paths you never dreamt of.
In this case I suspect the issue was radiated but *never* assume with EMC.
And what:
[a]does a capacitor do very well@ very high frequencies?
what does any inductance even self inductance in the cable do at very high frequencies?? especially any form of coil or iron ......Are you suggesting that such could get back through a long run of cable two battery chargers & @ least two batteries all of which would either act as chokes or bypass capacitors
Oh Gawd! Don't tell me you're an expert on EMC too (a PhD perhaps?) in addition to all your other wisdom.
When you're at the bottom of the hole... stop digging.
__________________
"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
We are discussing frequencies in the hundreds of megahertz region and they do not behave in the same way as the low frequencies you may be more familiar with. Parasitic effects have a far greater impact at such frequencies and a battery simply looks like a capacitor with built in transmission lines at 200MHz or the like.
For the past 25+ years I have been designing electronics systems which are required to comply with both emissions and immunity EMC standards and for the past six years I have specialised in EMC consulting and if I have learned nothing else over that time I have learned never to say "It can't do that" with EMC it's is far, far too complicated in its behaviour and will find coupling paths you never dreamt of.
In this case I suspect the issue was radiated but *never* assume with EMC.
And what:
[a]does a capacitor do very well@ very high frequencies?
what does any inductance even self inductance in the cable do at very high frequencies?? especially any form of coil or iron ......Are you suggesting that such could get back through a long run of cable two battery chargers & @ least two batteries all of which would either act as chokes or bypass capacitors
Oh Gawd! Don't tell me you're an expert on EMC too (a PhD perhaps?) in addition to all your other wisdom.
When you're at the bottom of the hole... stop digging.
Not a very good answer or is it you simply cannot answer???
