I have at home a satellite dish and an aerial for digital terrestrial TV (DTT).

After the aerial there is an amplifier for the DTT signal.

After the amplifier, there is a mixer that combines the satellite and DTT frequencies.

From the mixer I feed, with separate coaxial cables, three TVs.

I need now to feed four TVs from one of those three coaxial cables that come from the mixer.

What is the best way to do that?

Since the range of frequencies is wider, given the satellite and DTT signals in the cable, do I need a specific type of splitter or other device?

The satellite signal seems strong.

The DTT signal is not that strong, some of the channels are pixelated or lost often.

All equipment is very new and cabling is of good quality and condition.

I do have three cables coming straight from the satellite that would be idle if I use the signal from the mixer. These cables fed the TVs in those other three rooms just with satellite signal. I want now to add DTT signal to those TVs.

Thanks,

Antonio

"asalcedo" wrote in message ...

I have at home a satellite dish and an aerial for digital terrestrial TV
(DTT).

After the aerial there is an amplifier for the DTT signal.

After the amplifier, there is a mixer that combines the satellite and
DTT frequencies.

From the mixer I feed, with separate coaxial cables, three TVs.

I need now to feed four TVs from one of those three coaxial cables that
come from the mixer.

What is the best way to do that?

Since the range of frequencies is wider, given the satellite and DTT
signals in the cable, do I need a specific type of splitter or other
device?

The satellite signal seems strong.

The DTT signal is not that strong, some of the channels are pixelated or
lost often.

All equipment is very new and cabling is of good quality and condition.

I do have three cables coming straight from the satellite that would be
idle if I use the signal from the mixer. These cables fed the TVs in
those other three rooms just with satellite signal. I want now to add
DTT signal to those TVs.

Thanks,

Antonio




--
asalcedo

It's difficult to work out what this "mixer" box is.
Two possibilities.
1) it's a Multiswitch.
If that's the case you will have 4 cables that go from the satellite dish LNB
direct to the Multiswitch. The TV aerial via an amp if needed will also
connect to the Multiswich. A wallplate in each room will connect to
a separate connectors on the multiswich. If any of the rooms have recording satellite
boxes like Sky+ they need to use two feeds from the Multiswich

The other arrangement you might have for the "mixer" is that it's
2) a distribution amplifier of the "loftbox" type
here the satellite signals from the LNB do not connect to the loftbox, they go direct to the
satellite receiver(s) in the normal way A UHF analogue RF output from the satellite box
goes up to the loft-box and is mixed with the aerial signals so the drop cables
to the TVs will carry DTT signals + an analogue satellite picture that will be what ever the sat box
is tuned to. Obviously a far more restrictive setup than "A"

Your description does not fully satisfy either if the above scenarios.

--
Graham.

%Profound_observation%

On May 3, 12:46*am, "Graham." wrote:
"asalcedo" wrote in ...

I have at home a satellite dish and an aerial for digital terrestrial TV
(DTT).

After the aerial there is an amplifier for the DTT signal.

After the amplifier, there is a mixer that combines the satellite and
DTT frequencies.

From the mixer I feed, with separate coaxial cables, three TVs.

I need now to feed four TVs from one of those three coaxial cables that
come from the mixer.

What is the best way to do that?

Since the range of frequencies is wider, given the satellite and DTT
signals in the cable, do I need a specific type of splitter or other
device?

The satellite signal seems strong.

The DTT signal is not that strong, some of the channels are pixelated or
lost often.

All equipment is very new and cabling is of good quality and condition.

I do have three cables coming straight from the satellite that would be
idle if I use the signal from the mixer. These cables fed the TVs in
those other three rooms just with satellite signal. I want now to add
DTT signal to those TVs.

Thanks,

Antonio

--
asalcedo

It's difficult to work out what this "mixer" box is.
Two possibilities.
1) it's a Multiswitch.
If that's the case you will have 4 cables that go from the satellite dish LNB
direct to the Multiswitch. The TV aerial via an amp if needed will also
connect to the Multiswich. A wallplate in each room will connect to
a separate connectors on the multiswich. If any of the rooms have recording satellite
boxes like Sky+ they need to use two feeds from the Multiswich

The other arrangement you might have for the "mixer" is that it's
2) a distribution amplifier of the "loftbox" type
here the satellite signals from the LNB do not connect to the loftbox, they go direct to the
satellite receiver(s) in the normal way *A UHF analogue RF output from the satellite box
goes up to the loft-box and is mixed with the aerial signals so the drop cables
to the TVs will carry DTT signals + an analogue satellite picture that will be what ever the sat box
is tuned to. Obviously a far more restrictive setup than "A"

Your description does not fully satisfy either if the above scenarios.

I presume the mixer really is a combiner, but there must also be a 3
way splitter after that which isnt mentioned. It sounds like the op
needs to replace the 3 way splitter with a 4 way. This will of course
reduce signal strength, whether this will affect the dtt picture
quality depends on the cause of the trouble. With no info on general
signal strength, aerial type and location etc, its hard to comment
further.


NT

On Mon, 2 May 2011 17:07:08 +0000, asalcedo wrote:

I have at home a satellite dish and an aerial for digital terrestrial TV
(DTT).

snip

I do have three cables coming straight from the satellite that would be
idle if I use the signal from the mixer. These cables fed the TVs in
those other three rooms just with satellite signal. I want now to add
DTT signal to those TVs.

Doesn't help you over much, but I suspect you've gone for the wrong
equipment.

http://spedr.com/B9v8GBPZ

It's a labgear distribution amplifier that handles just about all
variations of input and up to 8 outputs. I have one and it does just what
it says on the box.....

--
The Wanderer

In large states public education will always be mediocre, for
the same reason that in large kitchens the cooking is usually bad.

The Wanderer wrote:

http://spedr.com/B9v8GBPZ

It's a labgear distribution amplifier that handles just about all
variations of input and up to 8 outputs. I have one and it does just what
it says on the box.....

Except it *doesn't* send any satellite feeds to the secondary rooms, it
sends the RF modulated output of the satellite decoder in the primary
room to the secondary rooms, which is fine, so long as everyone wishes
to watch the same thing from satellite at the same time, or arranges to
watch something at a time when nobody else is watching or recording from
satellite at the same time.

This is for my house in Spain.

The LNB has four cables.

One of them goes to the mixer or combiner. The other three go straight to different TVs (they would become idle if I do what I want to do).

One cable from the aerial goes to the combiner.

One cable comes out of the combiner and goes into a dumb or passive splitter (no electronics in this splitter, just a block of metal).

Three cables come out of this splitter.

I need to further split the signal of one of these three cables into 4 cables.

Since it seems too much splitting I think I may need a splitter that reduces the signal loss and that splits the wider range of frequencies required to view DTT and Satellite.

If the above is correct, which splitter is this?

In message , asalcedo
wrote

Since it seems too much splitting I think I may need a splitter that
reduces the signal loss and that splits the wider range of frequencies
required to view DTT and Satellite.

Does each room have its own satellite receiver STB?


--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

asalcedo wrote:

Since it seems too much splitting I think I may need a splitter that
reduces the signal loss and that splits the wider range of frequencies
required to view DTT and Satellite.

You *can't* simply split a satellite signal, the receiver actively
powers and controls the LNB on the dish, multiple receivers wouldn't work.

As suggested you need a multiswitch, which takes four inputs from the
LNB and usually an input from the aerial, and delivers 4 our 8 or more
outlets each of which can have a passive faceplate to separate the TV
and SAT signals.

It's almost certain you will have a quad LNB, most multiswitches require
a quattro LNB, though if you look around there are multiswitches which
are compatible with quad LNBs, though most of them are more expensive
than replacing the quad with a quattro and using a 'normal' multiswitch.

In message , Andy
Burns wrote
asalcedo wrote:

Since it seems too much splitting I think I may need a splitter that
reduces the signal loss and that splits the wider range of frequencies
required to view DTT and Satellite.

You *can't* simply split a satellite signal, the receiver actively
powers and controls the LNB on the dish, multiple receivers wouldn't work.

As suggested you need a multiswitch, which takes four inputs from the
LNB and usually an input from the aerial, and delivers 4 our 8 or more
outlets each of which can have a passive faceplate to separate the TV
and SAT signals.

It's almost certain you will have a quad LNB, most multiswitches require
a quattro LNB, though if you look around there are multiswitches which
are compatible with quad LNBs, though most of them are more expensive
than replacing the quad with a quattro and using a 'normal' multiswitch.


Or maybe something like
Triax DDU112 Loft Box
http://www.satmax.co.nz/Technical_Info/DDU-%20In%20House%20System.pdf


--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

Alan wrote:

Or maybe something like
Triax DDU112 Loft Box
http://www.satmax.co.nz/Technical_Info/DDU-%20In%20House%20System.pdf

Yes, that's a potentially useful half-way house, providing you only want
'full' SAT reception in a limited number of the secondary locations (two
locations for single tuners, one location for dual tuner) and RF viewing
of the main SAT receiver in the rest of them.

Cuts down on the number of cable drops required and on having separate
di/tri-plexers.

On May 3, 9:25*pm, Andy Burns wrote:
asalcedo wrote:
Since it seems too much splitting I think I may need a splitter that
reduces the signal loss and that splits the wider range of frequencies
required to view DTT and Satellite.

You *can't* simply split a satellite signal, the receiver actively
powers and controls the LNB on the dish, multiple receivers wouldn't work..

I wonder if the OP has tried it in each room one-at-a-time and
concluded that it does work?

Or tried two or more STBs tuned to the same channel (that can
sometimes work, though it can potentially kill the STBs and/or LNB!).

asalcedo - if you want satellite in multiple rooms, the cheapest
option for a small number of rooms is what you have now (separate feed
from LNB to each room) - the _only_ way of "splitting" a satellite
feed so that it works in more than one room at once is to take four
feeds from the dish to a multiswitch, and then the multiswitch
provides multiple outputs, each of which can be connected to exactly
one STB. (PVRs require two feeds).

Cheers,
David.

Yes, each room has its own satellite receiver set-top box (multi room subscription). Plus each room has a wall plate with two plugs, one for the satellite and one for the DTT

I left the installation to a local specialist without me getting too involved.

Perhaps he did go for the wrong kind of equipment.

Is it then a multiswitch the one to go for? Since I am reading conflicting inputs, which one in particular?

I will nevertheless try first a simple four way splitter and see if it works. It is a much simpler solution for my present arrangement.

asalcedo wrote:

Is it then a multiswitch the one to go for? Since I am reading
conflicting inputs, which one in particular?

A multiswitch will let you view from satellite and aerial in all
locations, the various "loftboxes" that have been shown as alternatives
will work, but only allow viewing of satellite in a one or two extra
rooms (depending on whether single or twin tuners required).

Don't forget the quad versus quattro LNB too.

I will nevertheless try first a simple four way splitter and see if it
works. It is a much simpler solution for my present arrangement.

It won't (unless you disconnect or turn off all but one satallite
receiver at a time).

asalcedo wrote:


Is it then a multiswitch the one to go for? Since I am reading
conflicting inputs, which one in particular?

Not to specifically recommend this make, or this supplier, but you will
see the "5 in" (4 in from quattro LNB plus 1 in from aerial) and
"8/12/16 etc out" multiswitches.

http://www.satellitesuperstore.com/m...bmultiswitches

That supplier *does* sell quad LNB switches, but they are "prefessional"
range and so more expensive

http://www.satellitesuperstore.com/m...bmultiswitches

There are cheaper quad compatible ones, e.g.

http://shop.conrad-uk.com/multimedia/tv-reception/distributer-and-installation-materials/sat-router-and-multi-switch/satellite-multi-switches-5-inputs-22kh/942130.html

but you may find it even cheaper to replace the quad LNB with a quattro
LNB provided access to the dish is not an issue ...

Hi Andy, thank you very much for your helpful comments.

I understand that the satellite receiver (what in the UK I call the Sky box) powers on the LNB, but why exactly will only one satellite receiver work if using a simple splitter?

Andy,

I am back to London in a couple of weeks' time. It is a good opportunity to purchase the equipment you recommend.

Access to the dish is excellent.

One question, will the equipment discussed before fully work in Spain? The satellite I care most about is the one Digital Plus uses, I believe it is Astra.

Lastly, and just to make sure I understood it correctly (for a 5in and 8 multiswitch): The multiswitch will receive as input the 4 cables from the Quatro LNB and one cable from the aerial and each of the 8 output cables will be able to tune to DTT channels and satellite channels independently (provided that a satellite receiver is in place for each of the 8 outputs)

Is this correct?


Many thanks again.

Atnonio

asalcedo wrote:

I understand that the satellite receiver powers on the LNB, but why
exactly will only one satellite receiver work if using a simple
splitter?

Because the receiver sends 22kHz pulses and/or different voltages to the
LNB to select a combination of high/low frequency band and
horizontal/vertical polarisation signal from the satellite(s).

If you use a passive splitter and more than one receiver is connected
it's likely they will each want to tune to different frequency bands and
polarisations, at best it won't work, at worst it could damage receiver
or LNB.

On Fri, 6 May 2011 08:05:02 +0000, asalcedo wrote:

I understand that the satellite receiver (what in the UK I call the Sky
box) powers on the LNB, but why exactly will only one satellite receiver
work if using a simple splitter?

The reciver does more than just power the LNB it also tells it which
polarisation and which band to send back to the reveier. Polarisation
is selected by the voltage sent up the cable and band by the precense
or not of a 22kHz tone.

Which band and which polarisation that the LNB needs to convert for
the receiver depends on the channel you want to watch. There may or
may not be a conflict but if there is things will get
"messy".

http://en.wikipedia.org/wiki/Low_noi...er#Universal_L
NB

--
Cheers
Dave.

David,

Thank you for your simple explanation that clarifies it all.

I understand now that what the professional did was close to optimal given his understanding, at the time, that the satellite feed would mostly always provide all DTT channels.

That is not the case now, quite a few DTT channels are not available in the local satellite feed. Thus, I want to provide DTT signal to the rooms that at the moment have only satellite signal.



And yes, I have had simultaneous viewing of different satellite channels at the same time in at least two different rooms. Caveat, one room was fed directly from the satellite, the other one was via the combiner. Which may confirm that my understanding that it did work was incorrect.