Satellite cabling, splitting?

[RobDickinson]

I don't want to feed 2 tuners..

I have sat cable into one side of living room, want to split it outside run another cable into other side of room give me the option of moving the TV.

Shouldn't be complicated? Done a lot of cable stuff in the past just never sat stuff.

[Super Slo Mo]

Cheap splitter from maplin will do the job adequately, think they lose around 3db of signal if memory serves me correctly.
The only thing you need to be mindful of is that many of them will only allow power to pass up one leg of the splitter, this is to power the LNB, you will need one to pass power on both legs.
The potential snag is if you add a second tuner at a later date as you can get power feeding back into the unit from the other tuner.

[Salesy]

Just use F connectors with through joints.

[RobDickinson]

Thanks, second tuner isn't likely, looks like dick Smith's have a diode splitter thing for $10 , checking jaycar now, our maplins

Cabling and connectors just coax etc?

[Super Slo Mo]

Yes just coax.

I don't think the diode splitter is what you want.

[RobDickinson]

Right have all the bits I need give it a go later cheers

[VEX]

Super Slo Mo said:

Cheap splitter from maplin will do the job adequately, think they lose around 3db of signal if memory serves me correctly.
The only thing you need to be mindful of is that many of them will only allow power to pass up one leg of the splitter, this is to power the LNB, you will need one to pass power on both legs.
The potential snag is if you add a second tuner at a later date as you can get power feeding back into the unit from the other tuner.

You also can't run two sat boxes on the same cable or connection to the dish.

Do pass on both legs of a splitter are readily available if you know where to look or who to ask

V.

[RobDickinson]

All done working great.

Its two feeds into the same room, just 8m apart no real likelihood of plugging in 2 tuners.

[VEX]

It will work well, just didn't want people to miss read the posts and think you could do two boxes of the same cable.

V.

[Super Slo Mo]

VEX said:

It will work well, just didn't want people to miss read the posts and think you could do two boxes of the same cable.

V.

Out of interest, why is that? Is it something specific to sat boxes?
It's not as though the LNB is doing anything more than downconverting the incoming frequencies, the tuning is done in the receiver.
We do it all the time with RF receivers, we happily run 4 receivers off one antenna (4 actually as we use diversity, but it amounts to the same thing). We could run more but you end up splitting signals more than once with a corresponding loss in signal strength.

[megaphone]

The Sat box outputs a voltage, 0 - 18v, which switches the LNB from vertical to horizontal polarisation, if you have two boxes they will conflict.

Edited by megaphone on Monday 30th November 08:34

[Super Slo Mo]

And you can't turn the voltage off on one of them? Does the polarity change depending on which group of frequencies you wish to receive?

[Magic919]

it can be H or V on the same frequency. There's also high and low band switching signals to the LNB.

[Super Slo Mo]

Ah ok, that makes sense. I don't do much with Satellite coms, can you tell?

Our downconverters have an internal switch that changes the local oscillator frequency, well, some of them do, some don't, depending on the age of them. Polarisation tends to be specific to the antenna design, but we generally use vertical as it works better as a rule with moving transmitters. Having said that, helicopter downlinks tend to be circular as the axis of the TX antenna can vary significantly.