Condition: Brand New

12 volt power unit for masthead amplifier

Please note: this is a power supply, not a booster or amplifier

Dispatched same working day, via Royal Mail

And now the product. 

A universal 12 volt power unit to drive a masthead amp, normally in the loft or outside. Using F type connectors (standard)

This power unit is normally situated in a corner next to the main TV in the house. It gives the impression that it is an amplifier, and most of my customers believe that that is the case. In fact if you looked on the back of this unit it will normally say 12V/100mA. This unit supplies 12 Volts to the amplifier either outside or in the loft. 

The 12 Volts actually goes up the coaxial cable situated where the main TV is to one of the inputs on the amplifier, amplifying the TV signal and then sending the signal to each output on the amplifier, including the one to the main TV.

The 12Volt power can break down for a number of reasons.

1:   General ware and tear. You can get more than 30years use out of these unit, but they will break down eventually.

2:   Overheating. The power unit installed in a place where air doesn't circulate very well

3:   Water from the aerial and amplifier running inside the coax cable to the power unit, damaging the connection and electronics inside the power unit.

4:   The final one and normally the most embarrassing one is accidently unplugging the power unit, cause not only the TV in the main room not to work but all the others than run off the amp.

The power unit will be in many degausses, with different coloured boxes, different type of boxes, different sizes, however they will all do they same thing. The only important thing here is the power rating. Most of them are 100mA (100 millamps). You do need to make sure that you get like for like, otherwise it may overheat and shorten the life of the unit.

Even though the power unit comes with screws to secure it to the wall, skirting, it will last longer if you don't, and simply rest it on the floor. If you don't want to do that then mount it on the wall, skirting but leave it loose so air can circulate the power unit to help keep it cool.

One other but important matter is that if water is getting into the coax cable, you need to resolve that problem before replacing the power unit. If there isn't any water in the cable but there is evidence that there was then again you need to resolve that before hand.

If resolving the water in the cable isn't possible do at that time, but you still need the TV signal to be working, a trick you can do is to put break in the aerial cable before it goes into the power unit. That way any water ( rain) that gets in the system will be stopped before going into the power and damaging.

You shouldn't use this as a fix and forget, because in the end it will cause more problems.

One final thing to consider is that if the power unit 12 Volt output is shorted out, it will shut the power unit down to protect it from any further damage. You will have to unplug the unit to reset it.

Hopefully I've covered all the bases. If you still have problems you can always message me.

Good Luck.

Some technical stuff from the manufacturer's

DC output: 12V 100mA
  • Power rating: 220~240V/50Hz
  • Insertion loss: 1dB
  • Operative temperature: -10°C ~ +40°C
  • Short-circuit protection: yes
  • Dimensions: 135x70x45
  • Weight: 0.344kg
  • Fixing screws included
  • LED on indicator
  • Fitted with 13A plug with approx. 1.5m lead
  • Compatible with virtually ALL masthead amplifiers





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