TV Aerial Amp - 12 input power supply?

[Richard10002]

Another 5 minute job that's going to take ages

Bought a new TV aerial with a 4 way mast head amplifier, so I can have TV in the saloon and in the bedroom. Fitted the aerial but discover that the power supply for the amp is 240v input, which converts to 12v. It seems the amp takes no more than 100mA.

I don't want to have an inverter running all the time I want to watch TV, so is there a masthead amp power supply that works with an input of 12V - I'm convinced that a boater somewhere will have dealt with this previously?

I think the various boaty type aerials from Glomex, Triax, Status, Shakespeare, come with 12v input power supplies, so I'm hoping that there might be some generic types aswell.

Many Thanks

Richard

 

[Heckler]

Another 5 minute job that's going to take ages

Bought a new TV aerial with a 4 way mast head amplifier, so I can have TV in the saloon and in the bedroom. Fitted the aerial but discover that the power supply for the amp is 240v input, which converts to 12v. It seems the amp takes no more than 100mA.

I don't want to have an inverter running all the time I want to watch TV, so is there a masthead amp power supply that works with an input of 12V - I'm convinced that a boater somewhere will have dealt with this previously?

I think the various boaty type aerials from Glomex, Triax, Status, Shakespeare, come with 12v input power supplies, so I'm hoping that there might be some generic types aswell.

Many Thanks

Richard

I have a power thing, with 12v or 24v input with satellite dish threaded connectors on, my masthead thing went tits up but the power thing is ok. So 12v to it, coax off one sat connector to mast head and coax off other to tv?
Stu

 

[DavidGrieves]

I think this should work

http://www.play.com/Electronics/Ele...Each-GLOBAL-COMMUNICATIONS-DCI-G/Product.html

It has a jack socket to insert 12v DC. I suppose you could connect the jack plug to the boat battery instead of the mains adaptor.

 

[Richard10002]

I think this should work

http://www.play.com/Electronics/Ele...Each-GLOBAL-COMMUNICATIONS-DCI-G/Product.html

It has a jack socket to insert 12v DC. I suppose you could connect the jack plug to the boat battery instead of the mains adaptor.

Looks good!

 

[William_H]

Yes tyically these amps will be quite tolerant of voltage supply. Just throw away the 240v supply and connect 12v from the boat into the amp head. They typically have the amp in the antenna and the 12v goes up the coax and the signal comes down the coax. This means you need a few components to separate the signal in a bottom end box.Don't just connect 12v supply to the coax because then you won't get a signal out. Typically the 12v comes from a plug pack.(transformer) So substitute the plug pack for the ships 12v supply. If the transformer is in the bottom box and the 240v mains lead goes into the box then you need to open it up and find the 12v line and attach the ships power to that. Disconnect the 240 v cable. good lcuk olewill

 

[Richard10002]

Hi Will,

Thanks for that.

Tried opening the box, but there are no screws, and I can't find how the top and bottom are clipped together. Prising wih screwdrivers looks like it will result in destroying the box - which is what I might do ultimately. I might be able to make the 12V side fit into a Maplin plastic box.

 

[Richard10002]

In the end, as the aerial has 4 inputs that will accept the DC feed, I used a length of coax cable not connected to either TV, and connected the inboard end to the boat 12V supply. Works fine.