Lines on some channels...

Psychobiker

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60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#1
Hi,

I'm from Ireland, and I'm hoping eventually to get satellite, once I've read around a little. But firstly, my terrestrial picture.
I have a VHF aerial and a 48 element UHF aerial. the signal from the UHF is amplified, the VHF not. When the amplifier is switched off and the UHF antenna is disconnected, the local channels are perfect, apart from a line down the middle. But when they're both connected and the UHF amplified,there are loads of horizontal lines across the screen (on the local channels only) - possibly from the power adapters in the loft?

L
 

Topper

Amo Amas Amant Admin
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IDD CI24 ECONO MM Penta 1.20 Galaxy II
1.2Mtr Polar MTG yes it has been on the arc for 25 years and is now fixed on 13 East using two pairs of rusty molegrips. Unlike me they never groan but always perform.
My Location
Blackburn, Lancashire
#2
Firstly can I say I am surprised that VHF tv is still transmitted I thought those transmissions stopped years ago. Why use VHF at all if you can receive UHF. This set up may be 'normal' for your particular area but it is not normal to me. I suspect that the lines are caused by interference fringing from the oscillator in the amplifier (which will be designed for use with UHF only probably) but I am curious to know how you are combining the two inputs, and suspect therein lies the root of your problem.
 

Psychobiker

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My Satellite Setup
60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#3
standard Y splitter....
 

Psychobiker

Regular Member
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My Satellite Setup
60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#4
standard Y splitter....
 

Topper

Amo Amas Amant Admin
Staff member
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My Satellite Setup
IDD CI24 ECONO MM Penta 1.20 Galaxy II
1.2Mtr Polar MTG yes it has been on the arc for 25 years and is now fixed on 13 East using two pairs of rusty molegrips. Unlike me they never groan but always perform.
My Location
Blackburn, Lancashire
#5
That depends on what it looks like, it should be a UHF/VHF combiner splitter like here just a standard indoor splitter I do not think will work for you, but there again I am not an expert at these things. Do you have a picture of yours?
 

Psychobiker

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60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#6
nay, it's not one like that!

I'll avail ASAP

Thanks!

L
 
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Midlands
#7
Psychobiker, when you say "lines", can you give more info?

There's possibly: a) picked up interference from all sorts of things, made worse by large aeirals and inadequate cables; :cool: wrong coaxial termination, causing signal reflections.

In general, you should use:

1) The correct type and gain aerial - whether it's VHF or UHF - for the transmitters you're getting.

2) Satellite grade (solid outer screen) cable.

3) A properly designed masthead combiner, for combining the differently banded aerials.

4) Baluns (maybe).

On a high gain aerial, with nearby electrical stuff, you might still get analogue tv interference whatever you do!

Satellite is cheap to obtain - as against the cost of any new aerial stuff - and fairly easy to set up, and you shouldn't get any problems like these.

I don't know which channels you want, or - offhand - if RTE is subscription only on Sky.
 

Psychobiker

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60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#8
we can get RTÉ perfectly when the big 48-element BBC aerial or amp isn't connected. BBC1/2/ITV/C4 are freeview digi?

L
 

rolfw

Believe it when I see it Admin.
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Berkshire
#9
Go to This Site or This site and scroll down the page to identify what your interference looks like.
 

Psychobiker

Regular Member
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My Satellite Setup
60CM Sky dish, Thomson LNB, PACE DS430N and FS Lifetime Ultra +
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Ireland
#10
yup! I've got a WRAP (wireless router application platform) up on the stack, essentially a computer. producing horizontal lines and also bad picture from cross signals and elec interference
 

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