FTA & terrestrial co-existance

emul

Gulp...new to all this so please bear with me..and I hope the right forum

Setup: 96cm disk with dual LNB feeding a SAB Explorer & Visionet F7100.
Signal strength is excellent, picture perfect

UHF & VHF aerials joined on masthead coming via one cable to signal splitter in attic (one antenna - two outputs)

Have run cable from aerial signal box into ANT IN on above recievers.

Visionet feeding one room , SAB other - both via single cable.

Problems:

1. From Aerial - RTE 1 / 2 / TV3 / TG4 - very poor signal (teletext rubbish) - previously ok

2. From Aerial - BBC 1 / 2 / ITV / CH4 - gone - not a major issue as have all but CH4 on FTA - but would like CH4 back.

3. On either TV I am picking up signal from other FTA box (good I can see what kids are watching) - but should this happen?

Any ideas? Thoughts?

byte

Are you sure you're feeding your aerial signal to the ANT IN? Sounds to me like they're connected wrong way around!

Is terrestrial signals OK if connected directly to television?

emul

yep, on the FTA boxes I have connect cable from LNB to IF Input and aerial to ANT IN.

byte

Does the aerial work OK if connected directly to the TVs?

I'm assuming you only have 2 TV's and the only way I can see how one can view the other is if aerial connections are wrong way around.

The ANT IN should not be outputting any signal. Again, I assume you haven't one box connected to the other box

emul

Yep aerial works okay direct connected. The boxes aren't connected to each other. The only common connection point is the aerial input / output box. Even then as you say I shouldn't be seeing other sat reciever on other TV !!

byte

Right, I'm convinced you've both aerials connected back to front - ANT OUT instead of ANT IN and vice versa.

It's unlikely that the RF modules on both satellite receivers are faulty.

emul

okay I'll check tomorrow - unfortunately all in attic with access thru babies room - thanks

Eoin

emul

Okay - I've checked all the connection and they are correct.

FTA 1 - LNB in, ANT in from aerial (UHF / VHF). TV out

FTA 2 - same.

Any other thoughts?

Darth Maul

could the rf on the sat recievers be on the same channel(or close) to the UK channels you are trying to recieve.

emul

How can I check this? and how would this effect RTE channels?

byte

There should be something about changing RF output in the manuals.

Could you give an exact description of how it's all wired. I hadn't realised the 2 boxes are also stacked in the attic.

Ulsterman 1690

IRRC the keycode is SERVICES 4 0 1 and then select the option for RF Channel number (maybe someone else can verify this)

The RF channel will be a number between 21 and 69 you might have to experiment with different numbers until you find one that doesnt cause interference to (or suffer interference from) terrestrial signals (The TV's will have to be reuned each time you change RF channel)

Also (at the risk of stating the obvious) dont put both boxes on the same RF channel

byte

That's only for Sky digiboxes Ulsterman. He's using a SAB box and a Visionet box.

Ulsterman 1690

ooops

silly me

emul

Gents

Thanks for the responses, I was stagging this weekend - hence my lack of response. Here's a very rough diug of the connection layout. I am checking manuals to see if I can alter the RF in anyway.

Thanks

E

byte

From your diagram, the only possible conclusion I can come to again is the RF Out is being fed back to the splitter, thus you getting a signal on other TV. THis in turn ruins incoming aerial signals. The RF input should NOT be outputting a signal.

So, I'm still convinced the RF IN and OUT are wrong way round. Swap them around on one of the boxes, just to see.

Other than that, I can't figure it out.

On an aside, I presume the coaxial plugs are wired correctly?

emul

At long last got the chance to review the setup. I found the issue was with the Triax box - taking terrestrial in and feeding to FTA receivers - it was faulty causing RTE etc to have a rubbish signal - and feeding one FTA to the other.... case closed - thanks for all the input / output :-)

Eoin

byte

Glad you got it sorted.