RE: Sky+ and terrestrial on 2 cables?

["Stephen Jones" <ukha@xxxxxxx>]

Hi Keith

That was the reply I was hoping for.

It's actually for a home I've been asked to help out with. There's only
been 2 co-ax ran to the roof, and no easy way of running more, seeing as
it's a flat roof house with no roof space.

The house is on the coast of NI but being at nearly sea-level it hardly
gets any local terrestrial signal at all, and a similar house beside it
has a long-range aerial pointing across the Irish Sea. So I reckon the
guys best going for Sky+, letting the Sky installer use both the cables
and then we'll fit a terrestrial aerial on the same mast and connect it
to one of the Sky+ cables using some kind of diplexer or filter.

Regarding Quattro/Quad LNB's - am I right in saying that a Quattro isn't
needed until you need more than 4 feeds? I mean there's no saving on
cables and with a Quattro you're always going to need a launch
amp/switch.

Cheers

Steve

-----Original Message-----
From: Keith Doxey [mailto:ukha@xxxxxxx]
Sent: 01 December 2003 18:11
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Sky+ and terrestrial on 2 cables?

> -----Original Message-----
> From: Stephen Jones [mailto:ukha@xxxxxxx]
> Sent: 01 December 2003 17:48
> To: UK-HA group
> Subject: [ukha_d] Sky+ and terrestrial on 2 cables?
>
> Quick quiz - Is it possible to combine signals from terrestrial
aerials
> onto the 2 cables from a quad LNB to the sky+ box? So that, for
example,
> 2 roof-top terrestrial aerials and a satellite dish feeding Sky+ only
> require the 2 co-ax cables.

Hi Steve,

I see no reason why not.

There a satellite distribution amps that feed LNB and Terrestrial aerial
over a single cable with a faceplate splitting the signal below. The
only
caveat woud be that these distribution amp are designed for two dual, or
a
single quattro LNB.

My previous analogue setup used two LNB's for Astra and Hotbird. The LNB
inputs to the switch were Astra_V, Astra_H, Hotbird_V, Hotbird_H. If the
22kHx tome was present I got Hotbird, without it I got Astra and the
13/18V
switching determined if it was Vertical or Horizontal.

With SKY digital the LNB actually has cover 4 channel ranges Low_V,
Low_H,
High_V, High_H.
A normal SKY digital LNB and the QUAD LNB's have switching circuitry
built
in to select Low/High V/H according to the voltage and 22kHz tone on
each
cable meaning that a satellite receiver can be connected directly to it.

By comparison, a QUATTRO LNB does not have the switching circuitry but
the
four outputs are LowV, LowH, HighV, HighH and are intended to be
connected
to a satellite switch. The real advantage of the Quattro/Switch method
over
a QUAD LNB is that switches are available with upto 32 outputs and you
can
also add additional switches meaning you can drive almost as many
receivers
as you like from a single dish and LNB.

There might be a simpler combiner so that you can just go...

LNB---\            /----SAT
-------------
ANT---/            \----TV

.. but you would need to find an independant installer who knew about
it.

Bet you wish you had run more cables now dont you !!!!

Hope that helps a little

Keith