Aerial Splitter Question

buntytrumpet

Standard Member
Hi,

I have an aerial on the side of my house, I connected it to one of these:

http://www.amazon.co.uk/gp/product/B0040Y5HXC

and then connected all the outs to the cables that run to the sockets throughout the house.

None of them work, so I connected an amplifier, it still does not work. Should I try a new aerial? If so could someone suggest one that might work with a tv with built in freeview hd?

I can get digital with a set top aerial but not the HD. If connecting the TV direct to the aerial output it does pick up the HD channels.

Thanks,
George
 

turanafon

Standard Member
hi there.

what kind of aerial do you have to start with and how many rooms are you trying to power.

if im right , i dont think its set up right to be honest.

where abouts is this splitter, ? in the loft? outside ?
 

buntytrumpet

Standard Member
I can't really tell what sort of aerial it is. I could post a picture of it when it's not dark. It's not the side of the house - facing south towards Crystal Palace.

It's about 10 years old i think. It came with the house, so i wouldn't mind buying one specific for this purpose.

I'm trying to power 6 rooms and have put the splitter in the loft...
 

buntytrumpet

Standard Member
Just tested the input to the junction box by plugging it into the TV, picked up BBC HD no problem.... So problem must be the junction box or the wiring from the loft to each of the rooms. The latter is brand new.
 

Peter Rhea

Novice Member
Even though you seem to have a decent signal available from the aerial, your passive splitter is trying to divide its power between 8 outputs, so this will result in a significant reduction in the level available at each output. Only the very strongest of signal levels will cope without amplification.

Some sort of amplifier would be in order, assuming everything else is up to par. Do you have a power socket in your loft? This isn't necessary but can narrow the available choice.
 

Gavtech

Administrator
There is no need for a new aerial when a direct feed provides all the channels.

A distribution amplifier is what is required.
 

buntytrumpet

Standard Member
I see, thanks for the help.

After reading a little before I went ahead I thought that perhaps I might make the signal too strong if i amplified it so i went for an ordianry splitter. I have tried amplifying the input to no avail. Is it better to return the splitter I have and just buy a proper amplifier as suggested?
 

turanafon

Standard Member
Hi Bunty, the one i suggested will work fine for your setup.
make sure your connections are ok, and there is no braiding touching the inner core.
 

grahamlthompson

Distinguished Member
I see, thanks for the help.

After reading a little before I went ahead I thought that perhaps I might make the signal too strong if i amplified it so i went for an ordianry splitter. I have tried amplifying the input to no avail. Is it better to return the splitter I have and just buy a proper amplifier as suggested?


YES. Every time you split the signal you reduce the signal. A simple 2 way split reduces the signal by a little more than half. (about 3.5dB)

A distribution amplifier simply recovers the splitting losses. Unless the input is already too strong the outputs won't be either.
 

Rodders53

Distinguished Member
The splitter you have provides 1/16 of the signal to each outlet port (-12dB) according to the manufacturer...http://www.antiference.co.uk/f-type-splitters-tap-units An amplifier with gain of at least 12dB between the aerial and splitter will be required to compensate for those losses. It must be located close to the aerial to do its job properly and before the splitter unit's input ... amplifying after the splitter will not work!

Most set-back splitter-amplifiers (or distribution amplifiers) will only have around 6dB gain to each outlet (4x the signal) so as not to over-amplify signals, just make up for the extra cable losses. So even in the correct place it may not have been enough!

Do also check all the new cables are made off properly with no stray whiskers of outer braid touching the centre conductor inside the plugs or sockets as that is often 'death' to the signal.

Replacing the splitter with a distribution amplifier should work, of course.
 

Chris Muriel

Distinguished Member
Rodders spotted what I also saw as soon as I followed the link. It's an 8-way passive splitter so each output is going to be at a minute level; you lose a little over half your signal with a simple 2-way splitter, halves again with a 4-way etc.
Those losses need to be compensated for (amplified up) before the signal from the antenna reaches the splitter.
 

buntytrumpet

Standard Member
firstly thank you for all the help.

I've got it working in several rooms, apart from the main lounge. I think the problem is the connection in the lounge but i've not got enough slack in the cable to reconnect the socket here. short of dropping a new cable down and drilling a new hole in the wall, is there anything that could be done?
 

grahamlthompson

Distinguished Member
firstly thank you for all the help.

I've got it working in several rooms, apart from the main lounge. I think the problem is the connection in the lounge but i've not got enough slack in the cable to reconnect the socket here. short of dropping a new cable down and drilling a new hole in the wall, is there anything that could be done?

Extend the cable, a pair of f connectors and a barrel connector will give you a good joint.

Labgear F Plug to F Plugs Pack of 10 | Screwfix.com
 

buntytrumpet

Standard Member
Worked a treat.... Connection is fine. Only issue is now that I can pick up 4HD fine, the normal channel 4 and 5 is now scrambled!
 

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