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Subject Topic: Advice 12volt Post Reply Post New Topic
PersonMollypops
21/7/2019 at 5:36pm
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Hi new here. When we turn on our 12volt in our caravan our portable radio which has normal batteries in turns off..Any one any idea why. Thank you. (It works perfectly without the 12v turned on)


Personnavver
21/7/2019 at 6:37pm
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Is your portable radio plugged in to anything in the caravan.


PersonMollypops
21/7/2019 at 7:57pm
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Hi, no it has just aa batteries in..Works fine till we switch on the 12volt then it goes off.


Personjake001
22/7/2019 at 3:36pm
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Try the radio in different positions in the caravan, something is obviously radiating a pulse of energy which is triggering the on/off logic circuit of the radio and you should be able to put it out of range.

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It'll do a trip


PersonMollypops
22/7/2019 at 3:40pm
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Hi yes we have tried it works fine in the van until we turn on the 12v then it just goes off it will work outside the van but not in . I am worried as to why this would happen more than anything else. Perfect without the 12v on . Thank you.


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PersonColin21
22/7/2019 at 4:17pm
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Does the radio actually go completely off, or does it just lose the signal?

Have you tried turning the 12 volt on with all the internal 12 volt equipment turned off, or isn't that possible? If that is possible, turn the radio on, turn on the 12 volt supply, then turn the appliances (lights etc) one by one until the radio goes off. You will then have found the culprit. I think Jake001 has a point. Something inside the caravan is radiating a signal of some kind.




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Best Regards,
Colin


PersonMollypops
22/7/2019 at 5:26pm
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Hi Colin, thank you. We have the radio on and it works great. Then we switch the 12 volt switch on (no actual appliances on light etc just the switch) and the radio switches off completely (radio is working on aa batteries just portable) very strange. Thank you.


PersonColin21
22/7/2019 at 6:37pm
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That is indeed a weird one, I've never heard anything like it! Have you tried this? Take the radio outside, turn it on, then leaving the radio outside turn on the caravan's 12 volt system. Having done this, take the radio inside the caravan. Does it go off, and if so how far in did you get before it did so?

I am thinking that something is causing a surge when you turn the 12 volt power on and this is somehow affecting the radio. I'm clutching at straws here though, as I've never heard anything like it before.


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Best Regards,
Colin


Personnavver
22/7/2019 at 7:32pm
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I'm still confused as to what you mean by the radio turns off.

Is there any indication such as a light in or on the radio that indicates it has power. If so does this go off?

What is the on/off switch on the radio like. Is it something that clicks or moves. If so does it click or move?

Can you confirm if the radio switches off or does it just lose the signal?


moorlander999
22/7/2019 at 8:47pm
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interference from the 12v transformer that runs your vans 12 volt lights etc ?


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PersonMollypops
23/7/2019 at 8:37am
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Thank you everyone. So the radio just makes a pop then seems to go off totally nothing at all. We plugged the 12v into our car and the radio is fine in the van then. So it just when the 12v is working through the leisure battery, which is fairly new. We are going to put another battery in to see if that solves the problem. Thank you for all your advice, much appreciated.


Personnavver
23/7/2019 at 8:03pm
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A transformer would radiate 50 Hz which would be heard as a fairly low hum on the radio.
The battery is direct current so cannot radiate anything.

The radiation is actually induction.
If a closed loop of wire is placed in a changing magnetic field, a voltage will be induced in the loop which causes a current to flow through it.

The changing magnetic field can be from magnet which are moving relative to the loop.

Similarly a changing current in a closed loop of wire causes a changing magnetic field which can induce a voltage in another loop which causes a current to flow through it. That is how a transformer works.

With Direct Current (DC as in batteries etc) this can only happen if the current is changing. This happened in the old car ignition coils when the contact breaker points opened before electronic ignition.

Modern battery chargers are probably switched mode power supplies and these do break the current very rapidly so I suppose this could possibly affect a radio.



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