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Wannabe Geek

Topic # 55145 24-Dec-2009 16:06
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I previously had a very very very old as wide as it was deep TV, which had alright reception on TV1 TV2 TV3, and a crappy TV4, It didnt pick up prime or any other channels

I just purchased a Full HD Sony, with a built in Freeview Receiver

On my roof, I have a 15 thingee UHF, and a VHF aerial.

I have replaced the thing in the wall, and now get a perfect mint TV1-TV4, but when programming the TV (or trying to) It wont find any digital channels at all, so I cannot get prime, or any programmes through the freeview decoder built into the TV

I have checked, and the cabling is RG6 from the antenna, and the UHF and VHF go into the box which joins the signal

Any ideas?  My neighbours all get prime, I am Pakuranga Auckland

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  Reply # 285014 24-Dec-2009 16:22
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You have a fault in the UHF signal path somewhere, maybe in the diplexor. Call an installer.



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  Reply # 285201 26-Dec-2009 01:10
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I have checked, and the cabling is RG6 from the antenna, and the UHF and VHF go into the box which joins the signal

Hi andy8791,

You may find that "the box which joins the signal" is not actually a diplexer (combines two different frequencies) but a masthead amplifier/diplexer. The most common one Sky used(which is where the majority of the UHF aerials came from) amplifies the UHF frequency and diplexes the VHF frequency. It then needs a power supply plugged into the 230 volts inside the house to power up the amplifier.

If the power supply is not connected inside the house (people often gather up all the cables, etc behind the TV, including the power supply, when they move out) then you will be receiving the VHF signals ok but nothing on UHF.

The most common masthead amplifiers are Kingray, Ikuzi and (recently) Johansen. If you can tell me what is written on the circuit board inside the box I will be able to tell you what it is - eg:- DIP02 = its a diplexer, MHU 24 = Its a masthead amplifier which amplifies the UHF by 24 db, etc.

Cheers,  Wild Bill

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