Question about Freesat signals
 

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Question about Freesat signals
 

On Sat, 22 Aug 2009 15:28:54 +0100, ChrisW
wrote:

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

The way to do it is with a Multiswitch fed by a Quattro LNB. Note
"quattro" not "quad".

A multiswitch can supply many separate feeds to individual decoders
(Freesat boxes)s.

For example I have a Triax TMPR 5 x 8 Multiswitch in my house. The 5
refers to 4 inputs from a quattro LNB and 1 input from a terrestrial
aerial. The 8 refers to the number of separate outputs. Each ouput is
distinct from the others. You can be watching or recording 8 different
things at once.
http://www.triax.co.uk/?alPage=&rkPage=&articleId={41D13EE6-2A3A-481C-8E5A-A8C3D37DA700}

I currently use 5 of the outputs - 2 each to 2 Freesat recorders and 1
to a non-recording Freesat box. I don't currently distribute the
terrestial TV signals through it, but this might change sometime.

--
Peter Duncanson
(in uk.tech.digital-tv)

Question about Freesat signals
 

ChrisW wrote:
: In what way is my understanding wrong? Is it that only one channel at
: a time is available on any one LNB? If this is the case, would that
: same channel be available on any decoder in the setup? How can one
: combine Freesat signals with DTT in a home distribution system?

You are missing the fact that, unlike a terrestrial aerial, a LNB is an
active component! In addition to needing DC power to run it each LNB can also
be in one of four possible states - horizontal or vertical polarisation
AND either high or low band - and this is controlled by the STB (using voltage
and tone switching). A quad-LNB, for example, is effectively 4 LNBs in
one housing - each can be in a different state!

You would need the system flats use. A different type of LNB (quattro rather
than quad??) supplies each of the 4 possible states into a multiswitch. Each
STB can select the exact band it wants from this multiswitch using normal
means.

Question about Freesat signals
 

On 22 Aug, 15:28, ChrisW wrote:

I am confused about satellite TV signals. *With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. *I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. *I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder. *
In what way is my understanding wrong? *Is it that only one channel at
a time is available on any one LNB? *If this is the case, would that
same channel be available on any decoder in the setup? *How can one
combine Freesat signals with DTT in a home distribution system?

As none of the experts have replied yet .... here goes.

When you tune a satellite receiver to a channel, the LNB moves into
one of its four ranges:- Horizontal Upper, Horizontal Lower, Vertical
Upper or Vertical Lower so that it can receive that channel.

Which means that other receivers cannot get channels on the other
ranges. Each receiver needs its own LNB to be able to operate
independently. The easiest way for four or fewer receivers is to get
a quad LNB and wire each receiver up individually.

For more that four you can get a switch with four inputs and a greater
number of outputs. Each receiver can be switched through to
whichever of the four ranges it needs.

HTH

Question about Freesat signals
 

ChrisW wrote:
I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Satellite is a little different to terrestrial broadcast, the LNB is
part of the receiver and has a switching signal that selects the
polarisation. This is a way of packing the channel closer together
without them interfering. As you go up the frequency the channels are
on alternating polarities. So for 1 polarity selection you only get
half the channels available at a decent level on one LNB.

You can have 2 LNB systems (one for each polarity) and distribute those
around the house with 2 cables, but you then need a separate selector
box that switches 2 cables to each receiver, or each receiver needs to
be able to have 2 dish/LNB feeds and select internally.

I'm not sure what quad LNBs are for, no doubt someone else will answer.
Maybe for more signal, or different satellites or different bands.

You can't generally mix satellite and terrestrial raw signals on the
same cable, likely they would interfere. The alternative to multiple
cables is one sat receiver with an RF modulator and use a carefully
chosen frequency and put that on your terrestrial network. You then use
some sort of remote repeater to control the satellite box. The Sat
signal then appears as one analogue TV channel.

--
Tony

Question about Freesat signals
 

"Peter Duncanson" wrote in message
...
On Sat, 22 Aug 2009 15:28:54 +0100, ChrisW
wrote:

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Two tricks are used to maximise the bandwidth from the satellite two your
dish.

1. There are two bands of ~1GHz each. These are mixed down to a single band
between ~1GHz and 2Ghz (which is about the limit of what you can get down a
cable).

2. The signals are sent in horizontal and vertical polarity, without the
polarity the channels would overlap somewhat and you would get adjacent
channel inteference. Only one polarity can be sent down the wire at once.

Essentially the receiver tells the LNB which band and polarity it wants (by
volts and tones). In a multi-switch all four are sent from the dish to the
switch and the selection is made inside the switch.

Have a butcher's on Wiki.


The way to do it is with a Multiswitch fed by a Quattro LNB. Note
"quattro" not "quad".

Depends on your switch - the latest EMP Centauri can cope with either.

Emerging technology is going to use fibre to send the whole lot down a
single fibre.


A multiswitch can supply many separate feeds to individual decoders
(Freesat boxes)s.

For example I have a Triax TMPR 5 x 8 Multiswitch in my house. The 5
refers to 4 inputs from a quattro LNB and 1 input from a terrestrial
aerial. The 8 refers to the number of separate outputs. Each ouput is
distinct from the others. You can be watching or recording 8 different
things at once.
http://www.triax.co.uk/?alPage=&rkPage=&articleId={41D13EE6-2A3A-481C-8E5A-A8C3D37DA700}

I currently use 5 of the outputs - 2 each to 2 Freesat recorders and 1
to a non-recording Freesat box. I don't currently distribute the
terrestial TV signals through it, but this might change sometime.

--
Peter Duncanson
(in uk.tech.digital-tv)

Question about Freesat signals
 

On Sat, 22 Aug 2009 16:06:18 +0100, Tony wrote:

You can't generally mix satellite and terrestrial raw signals on the
same cable

Of course you can.

likely they would interfere.

They use completely separate frequency bands. It is not "likely". It is
completely unlikely.

The alternative to multiple
cables is one sat receiver with an RF modulator and use a carefully
chosen frequency and put that on your terrestrial network. You then use
some sort of remote repeater to control the satellite box. The Sat
signal then appears as one analogue TV channel.

For God's sake, this is a completely mad solution.

Question about Freesat signals
 

On 22 Aug, 19:49, Paul Ratcliffe
wrote:
On Sat, 22 Aug 2009 16:06:18 +0100, Tony wrote:
You can't generally mix satellite and terrestrial raw signals on the
same cable

Of course you can.

likely they would interfere.

They use completely separate frequency bands. It is not "likely". It is
completely unlikely.

The alternative to multiple
cables is one sat receiver with an RF modulator and use a carefully
chosen frequency and put that on your terrestrial network. *You then use
some sort of remote repeater to control the satellite box. *The Sat
signal then appears as one analogue TV channel.

For God's sake, this is a completely mad solution.

But it is the way that all Sky receivers do it when they are fed
through RF distribution and operated with "magic eyes".
The main reason to do it this way with Sky boxes, however, is to make
the box viewable in various rooms without having to have more than one
subscription. There are, of course, no subscriptions with Freesat so
its much better to have extra receivers in other rooms for channel
flexibility.

There is no reason why a quad LNB cannot be used and diplexers used to
combine its outputs onto four of the downleads from the aerial amp, to
four rooms, and then diplex wall plates to seperate the aerial and
dish signals by the tvs. Each room then has an aerial feed to the TV
and a sat feed to a Freesat box.
This is a bit less tidy than a multiswitch but is potentially cheaper
if the aerial distribution amp is already in place.

Question about Freesat signals
 

"Peter Duncanson" wrote in message
...
On Sat, 22 Aug 2009 15:28:54 +0100, ChrisW
wrote:

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

The way to do it is with a Multiswitch fed by a Quattro LNB. Note
"quattro" not "quad".

A multiswitch can supply many separate feeds to individual decoders
(Freesat boxes)s.

For example I have a Triax TMPR 5 x 8 Multiswitch in my house. The 5
refers to 4 inputs from a quattro LNB and 1 input from a terrestrial
aerial. The 8 refers to the number of separate outputs. Each ouput is
distinct from the others. You can be watching or recording 8 different
things at once.


Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs

A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish

Steve Terry

Question about Freesat signals
 

"Paul Ratcliffe" wrote in message
...
On Sat, 22 Aug 2009 16:06:18 +0100, Tony wrote:

You can't generally mix satellite and terrestrial raw signals on the
same cable

Of course you can.
And this is how virtually every TV distribution system works.


likely they would interfere.
There's a small problem with this at the top end of the UHF band but it is
easily and routinely solved by filters in the multiswitches and wallplates.

Bill

Question about Freesat signals
 

"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs
Or one dish with an octo LNB.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish
Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.

Bill

Question about Freesat signals
 

"Bill Wright" wrote in message
...
"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs

Or one dish with an octo LNB.

Bloody fiddly sockets thou and more than double the price of a dish and quad
LNB

A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish

Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.
Bill

That's handy, makes for a simple community aerial system,
and getting cheaper all the time

Steve Terry

Question about Freesat signals
 

"Steve Terry" wrote in message
...
"Bill Wright" wrote in message
...
"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs

Or one dish with an octo LNB.

Bloody fiddly sockets thou and more than double the price of a dish and
quad LNB
Yes, they are really only a solution if you are not wanting to fit two
dishes. I think they'll get cheaper though.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish

Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.
Bill

That's handy, makes for a simple community aerial system,
and getting cheaper all the time
Problem are that for communal systems you still have to earthbond, and of
course there's the need to add terrestrial. These switches attenuate
terrestrial signals severely. They are really only suitable for one-dwelling
systems with no terrestrial.

Bill

Question about Freesat signals
 

In article ,
Paul Ratcliffe wrote:
On Sat, 22 Aug 2009 16:06:18 +0100, Tony wrote:

You can't generally mix satellite and terrestrial raw signals on the
same cable

Of course you can.

likely they would interfere.

They use completely separate frequency bands. It is not "likely". It is
completely unlikely.

but remember that the LNB acts as a frequency changer. What is fed from
the LNB is at uhf. this could (and has in the past) interfere with
terrestrial signals

--
From KT24

Using a RISC OS computer running v5.11

Question about Freesat signals
 

On Sun, 23 Aug 2009 00:35:26 +0100, charles
wrote:

You can't generally mix satellite and terrestrial raw signals on the
same cable

Of course you can.

likely they would interfere.

They use completely separate frequency bands. It is not "likely". It is
completely unlikely.

but remember that the LNB acts as a frequency changer. What is fed from
the LNB is at uhf. this could (and has in the past) interfere with
terrestrial signals

Yes, you can get out-of-band crap from the LNB but it is not in the
normal range of frequencies used for real signals and, as Bill says,
the rubbish should be filtered out before combining.

Supplementary question
 

Can someone please explain the point of the "loop out" socket on my FTA
satellite receiver?

Given that the receiver evidently switches the single LNB in my set-up
into one of four possible modes, it seems to me that a daisy-chained
receiver (say in another room) would only have access to (roughly) one-
quarter of the channels, as determined by the first receiver.

Would control signals from the second receiver be sent back through the
loop connection and change the mode of the LNB? Can the "loop out"
serve any useful purpose?

--
John Legon

Supplementary question
 

On 23/08/09 10:37, John Legon wrote:

Can someone please explain the point of the "loop out" socket on my FTA
satellite receiver?

Allows another satellite receiver to be used (e.g. in a bedroom) so long
as the one with "loop out" is switched off.

Question about Freesat signals
 

On Sat, 22 Aug 2009 18:05:53 +0100, "R. Mark Clayton"
wrote:


"Peter Duncanson" wrote in message
.. .
On Sat, 22 Aug 2009 15:28:54 +0100, ChrisW
wrote:

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Two tricks are used to maximise the bandwidth from the satellite two your
dish.

1. There are two bands of ~1GHz each. These are mixed down to a single band
between ~1GHz and 2Ghz (which is about the limit of what you can get down a
cable).

2. The signals are sent in horizontal and vertical polarity, without the
polarity the channels would overlap somewhat and you would get adjacent
channel inteference. Only one polarity can be sent down the wire at once.

Essentially the receiver tells the LNB which band and polarity it wants (by
volts and tones). In a multi-switch all four are sent from the dish to the
switch and the selection is made inside the switch.

Have a butcher's on Wiki.


The way to do it is with a Multiswitch fed by a Quattro LNB. Note
"quattro" not "quad".

Depends on your switch - the latest EMP Centauri can cope with either.

Emerging technology is going to use fibre to send the whole lot down a
single fibre.

I think it's already emerged:

http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

Apparently quite expensive at the moment
--
Cheers

Peter

Question about Freesat signals
 

snip


Emerging technology is going to use fibre to send the whole lot down a
single fibre.

I think it's already emerged:

http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

Well I would say it was still emerging.


Apparently quite expensive at the moment

Not half, but expect this to change and to be able to cascade the LNB's.

--
Cheers

Peter

Question about Freesat signals
 

"Bill Wright" wrote in message
...

"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs
Or one dish with an octo LNB.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish
Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.

Bill


That is pushing - if only one receiver is on (or configured to provide LNB
power in standby) then you have to power the switch and any LNB in use down
one cable...

Question about Freesat signals
 

So the next question then, is if some of the people have freesat and some
have pay once Sky boxes, can both coexist on the same dish and multiswitch?
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"R. Mark Clayton" wrote in message
...

"Peter Duncanson" wrote in message
...
On Sat, 22 Aug 2009 15:28:54 +0100, ChrisW
wrote:

I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder.

In what way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Two tricks are used to maximise the bandwidth from the satellite two your
dish.

1. There are two bands of ~1GHz each. These are mixed down to a single
band between ~1GHz and 2Ghz (which is about the limit of what you can get
down a cable).

2. The signals are sent in horizontal and vertical polarity, without the
polarity the channels would overlap somewhat and you would get adjacent
channel inteference. Only one polarity can be sent down the wire at once.

Essentially the receiver tells the LNB which band and polarity it wants
(by volts and tones). In a multi-switch all four are sent from the dish
to the switch and the selection is made inside the switch.

Have a butcher's on Wiki.


The way to do it is with a Multiswitch fed by a Quattro LNB. Note
"quattro" not "quad".

Depends on your switch - the latest EMP Centauri can cope with either.

Emerging technology is going to use fibre to send the whole lot down a
single fibre.


A multiswitch can supply many separate feeds to individual decoders
(Freesat boxes)s.

For example I have a Triax TMPR 5 x 8 Multiswitch in my house. The 5
refers to 4 inputs from a quattro LNB and 1 input from a terrestrial
aerial. The 8 refers to the number of separate outputs. Each ouput is
distinct from the others. You can be watching or recording 8 different
things at once.
http://www.triax.co.uk/?alPage=&rkPage=&articleId={41D13EE6-2A3A-481C-8E5A-A8C3D37DA700}

I currently use 5 of the outputs - 2 each to 2 Freesat recorders and 1
to a non-recording Freesat box. I don't currently distribute the
terrestial TV signals through it, but this might change sometime.

--
Peter Duncanson
(in uk.tech.digital-tv)

Question about Freesat signals
 

Surely every time you attempt to share the focal point with more and more
lnbs, the performance of the system goes down. They cannot all be in the
best position, surely?
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Bill Wright" wrote in message
...

"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs
Or one dish with an octo LNB.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish
Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.

Bill

Question about Freesat signals
 

Don't know of any that do justice to stereo sound though..
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Tony" wrote in message
...
ChrisW wrote:
I am confused about satellite TV signals. With DTT I feed the signal
from one aerial into a distribution amplifier and the signal and all
channels are then available to any of the amps distribution points. I
am told that for satellite one needs a separate LNB for each TV set -
dual and quad LNBs seem to be common. I was planning to feed a single
Freesat signal into the Sat input of a suitable distribution amp and
was expecting the Freesat signal to be available at all distribution
points and to be available wherever I had a suitable decoder. In what
way is my understanding wrong? Is it that only one channel at
a time is available on any one LNB? If this is the case, would that
same channel be available on any decoder in the setup? How can one
combine Freesat signals with DTT in a home distribution system?

Satellite is a little different to terrestrial broadcast, the LNB is part
of the receiver and has a switching signal that selects the polarisation.
This is a way of packing the channel closer together without them
interfering. As you go up the frequency the channels are on alternating
polarities. So for 1 polarity selection you only get half the channels
available at a decent level on one LNB.

You can have 2 LNB systems (one for each polarity) and distribute those
around the house with 2 cables, but you then need a separate selector box
that switches 2 cables to each receiver, or each receiver needs to be able
to have 2 dish/LNB feeds and select internally.

I'm not sure what quad LNBs are for, no doubt someone else will answer.
Maybe for more signal, or different satellites or different bands.

You can't generally mix satellite and terrestrial raw signals on the same
cable, likely they would interfere. The alternative to multiple cables is
one sat receiver with an RF modulator and use a carefully chosen frequency
and put that on your terrestrial network. You then use some sort of
remote repeater to control the satellite box. The Sat signal then appears
as one analogue TV channel.

--
Tony

Supplementary question
 

At 10:44:48 Sun, 23 Aug 2009, Andy Burns
wrote:
On 23/08/09 10:37, John Legon wrote:
Can someone please explain the point of the "loop out" socket on my FTA
satellite receiver?

Allows another satellite receiver to be used (e.g. in a bedroom) so long
as the one with "loop out" is switched off.

Thanks for this. I assume that the first box (with the loop out) would
have to be on stand-by rather than switched off (from the mains), as
there might be some active circuitry to avoid signal loss or whatever,
and perhaps also to supply power to the LNB.

--
John Legon

Question about Freesat signals
 

"Petert" wrote in message
...
On Sat, 22 Aug 2009 18:05:53 +0100, "R. Mark Clayton"
Emerging technology is going to use fibre to send the whole lot down a
single fibre.

I think it's already emerged:

http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

Apparently quite expensive at the moment


I did touch on this in my recent Wotsat column. Several manufacturers are
bringing equipment out, and the whole thing does look very promising.

Bill

Question about Freesat signals
 

"R. Mark Clayton" wrote in message
...
snip


Emerging technology is going to use fibre to send the whole lot down a
single fibre.

I think it's already emerged:

http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

Well I would say it was still emerging.


Apparently quite expensive at the moment

Not half, but expect this to change and to be able to cascade the LNB's.

Actually, when you look at the global cost of a system, it isn't that bad.
Copper is expensive. I'm anticipating that soon we will be able to replace
very long (500m) CT233 cables with fibre.

Bill

Question about Freesat signals
 

"R. Mark Clayton" wrote in message
...

"Bill Wright" wrote in message
...

"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs
Or one dish with an octo LNB.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish
Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.

Bill


That is pushing - if only one receiver is on (or configured to provide LNB
power in standby) then you have to power the switch and any LNB in use
down one cable...

I quizzed several manufacturers about this at the recent CAI show, and they
assured me that a modern Sky box will be untroubled by the load. I am a bit
sceptical.

Bill

Question about Freesat signals
 

"Brian Gaff" wrote in message
om...
Surely every time you attempt to share the focal point with more and more
lnbs, the performance of the system goes down. They cannot all be in the
best position, surely?
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Bill Wright" wrote in message
...

"Steve Terry" wrote in message
...

Or for less cost you could put up 2 dishes, each with a quad LNB
to give you those 8 outputs
Or one dish with an octo LNB.


A multiswitch is only worth bothering if you want more outputs
or can't put up more than one dish
Yes, although there are now some multiswitches that need no local power
supply. They get all their power from the receivers.

Bill

Not with you Brian.

Bill

Question about Freesat signals
 

"Brian Gaff" wrote in message
m...
So the next question then, is if some of the people have freesat and some
have pay once Sky boxes, can both coexist on the same dish and
multiswitch?
Brian

Yes. This happens all the time.

Bill

Question about Freesat signals
 

In message , writes
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and they
assured me that a modern Sky box will be untroubled by the load. I am a bit
sceptical.

How is it proposed that fibre fed LNBs are powered?

Line power using James Bond laser at the receiving end?
Alternatively, I would think coax would work.
--
Ian

Question about Freesat signals
 

On Sun, 23 Aug 2009 17:05:22 +0100, Ian Jackson
wrote:

In message , writes
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and they
assured me that a modern Sky box will be untroubled by the load. I am a bit
sceptical.

How is it proposed that fibre fed LNBs are powered?

Line power using James Bond laser at the receiving end?

Hmm. With a nicely polished dish perhaps the death ray could zap a path
through any troublesome trees etc.

Alternatively, I would think coax would work.

--
Peter Duncanson
(in uk.tech.digital-tv)

Question about Freesat signals
 

Ian Jackson wrote:

In message , writes

How is it proposed that fibre fed LNBs are powered?

Line power using James Bond laser at the receiving end?
Alternatively, I would think coax would work.

Yes, the Triax optical LNB that was mentioned in this group earlier in the
year had an f-connector for power, presumably because aerial riggers
already have the kit to waterproof coax connections.

--
Dave Farrance

Question about Freesat signals
 

In message , wrote
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and they
assured me that a modern Sky box will be untroubled by the load. I am a bit
sceptical.

How is it proposed that fibre fed LNBs are powered?


Send light with a different wavelength back up the fibre and shine it on
a solar cell in the LNB.

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

Question about Freesat signals
 

In message , Alan
writes
In message , wrote
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and they
assured me that a modern Sky box will be untroubled by the load. I am a bit
sceptical.

How is it proposed that fibre fed LNBs are powered?


Send light with a different wavelength back up the fibre and shine it
on a solar cell in the LNB.

Alternatively, feed the return path light (on the different wavelength,
and diplexed out via an optical filter, of course) into water in a
boiler. The water heats up and generates steam, which drives a
generator, which generates electricity, which powers the LNB.

On the other hand, a coax power feed might be easier.
--
Ian

Question about Freesat signals
 

On Sun, 23 Aug 2009 13:20:52 +0100, "R. Mark Clayton"
wrote:

snip


Emerging technology is going to use fibre to send the whole lot down a
single fibre.

I think it's already emerged:

http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

Well I would say it was still emerging.


Apparently quite expensive at the moment

Not half, but expect this to change and to be able to cascade the LNB's.

by cascade do you mean:

http://www.triax.co.uk/Products/Fibr...onverters.aspx

It certainly sounds good - far less cabling required - just the one
fibre patch-cord to each TV (Then an optical - electrical converter)

It uses industry standard FC/PC connectors too
--
Cheers

Peter

Question about Freesat signals
 

wrote in message ...
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and
they
assured me that a modern Sky box will be untroubled by the load. I am a
bit
sceptical.

How is it proposed that fibre fed LNBs are powered?

They have an F-connector connection for power only, but these could be
chained.


--
BD
Change lycos to yahoo to reply

Question about Freesat signals
 

wrote in message ...
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and
they
assured me that a modern Sky box will be untroubled by the load. I am a
bit
sceptical.

How is it proposed that fibre fed LNBs are powered?

By coax.

Bill

Question about Freesat signals
 

wrote in message ...
On 23 Aug,
"Bill Wright" wrote:

I quizzed several manufacturers about this at the recent CAI show, and
they
assured me that a modern Sky box will be untroubled by the load. I am a
bit
sceptical.

How is it proposed that fibre fed LNBs are powered?

The fibre includes a hollow tube. A small compressor at the head end forces
air into this tube. At the LNB a tiny and intricate pneumatic engine drives
an alternator. In areas with mains gas a supply of same can be introduced
into the pipe, and a miniature gas turbine fitted to the LNB.

The best idea of all, it seems to me, if for the LNB to be powered by
batteries. The batteries will be special ones that can only be replaced by
licensed dish installers. The cost is expected to be immodest.

Bill

Question about Freesat signals
 

On Sun, 23 Aug 2009 21:35:18 +0100, Bill Wright
wrote:


wrote in message

How is it proposed that fibre fed LNBs are powered?

The fibre includes a hollow tube. A small compressor at the head end
forces
air into this tube. At the LNB a tiny and intricate pneumatic engine
drives
an alternator. In areas with mains gas a supply of same can be introduced
into the pipe, and a miniature gas turbine fitted to the LNB.

The best idea of all, it seems to me, if for the LNB to be powered by
batteries. The batteries will be special ones that can only be replaced
by
licensed dish installers. The cost is expected to be immodest.

Bill


I would have thought in these "ECO" times you would have suggested a Wind
Generator Bill ... hot or cold air would suffice and when the wind didn't
blow you could pop round and ... setup a generator attached to their
fridge door and they would just have to keep opening and closing it like
they do normally when they're snacking.

--
http://www.madge.tk Madges Links
http://twitter.com/MadgeTwits Yes IKNOW.

Question about Freesat signals
 

"Madge" wrote in message
news:[email protected]
On Sun, 23 Aug 2009 21:35:18 +0100, Bill Wright
The best idea of all, it seems to me, if for the LNB to be powered by
batteries. The batteries will be special ones that can only be replaced
by
licensed dish installers. The cost is expected to be immodest.

Bill


I would have thought in these "ECO" times you would have suggested a Wind
Generator Bill ... hot or cold air would suffice and when the wind didn't
blow
When the wind doesn't blow it won't matter because there will be no leccy
for the telly.


you could pop round and ... setup a generator attached to their fridge
door and they would just have to keep opening and closing it like they do
normally when they're snacking.

How about a generator attached to their fridge doors that outputs to
electrodes on their goolies? That'll teach the fat buggers.

Bill