On Mon, 26 Apr 2004 21:41:30 GMT, (Lurch)
wrote:

On Mon, 26 Apr 2004 20:43:41 GMT, in uk.d-i-y Ian Stirling
strung together this:

It's the cable directly from the dish.
This can't go through a distribuition amp, without being decoded by the
box first, as the signals from the satellite are not normal TV ones.

Try reading up on the product I mentioned in the post. I won't point
out the several incorrect comments in your post just yet, nah **** it,
I will.
I know it's the cable directly from the dish, no need to point that
out again.
The satellite signal can go through a distribution amp, just not a
normal uhf\vhf amp.
It's a signal in a frequency range, it can be amplified by a suitably
matched amp. It doesn't need decoding before being amplified.
I know satellite signals are different from normal tv ones,
If I got it wrong how do you suppose it all worked when it was
installed and tested? Bearing in mind I have fitted these units, you
obviously haven't.

I've looked at this one, Lurch, and from the diagram it appears to
work as follows:

- TV, VHF and satellite dish cables are brought together at the
Loftbox and combined though a filter. THere may or may not be
amplification. VHF signals are those below 300MHz, then UHF
terrestrial TV goes from approx 400 to approx 850MHz. The
satellite IF signal between the LNB and the receiver ranges from about
950 to 1950 MHz. The main point here is that it is a cabling
convenience of everything from the box to the prime TV position on one
cable.

- A single cable goes from the Loftbox to a filter box (typically in
the living room) which then splits the signals back out again into TV,
VHF and satellite.

- The TV and satellite signals go to the (typically Sky) satellite
receiver.

- One UHF output from the satellite box goes to the living room TV,
the other optionally back to the Loftbox on a separate cable.

- VHF and UHF distribution amplification in the Loftbox then provides
for outlets to go to a number of TV sets (4?) in other parts of the
house.

- If all of this is connected up, it should be possible to watch
terrestrial TV and the satellite channel selected on the satellite
box. With TVLink sensors, the satellite box could also be controlled
from the other rooms with TV.

However........

What I am pretty sure that it won't do is to deliver a satellite
signal to more than one receiver in one place.

This requires either a quad LNB or a quattro LNB with multiswitch.
Both of those require four cables (actually up to 4 with a quad) from
the LNB.
..andy

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