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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions.

Distributing digital signals in an apartment block



 
 
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  #11  
Old September 16th 05, 06:22 PM posted to uk.tech.digital-tv
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Default Distributing digital signals in an apartment block

I just thought. Subscribe to the Digital Television Viewers Guide. The
2005 edition has an article aimed at people who have to make the
decisions about TV systems in apartment blocks. See
www.viewersguide.co.uk

Bill

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  #12  
Old September 17th 05, 12:06 AM posted to uk.tech.digital-tv
Les
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Default Distributing digital signals in an apartment block

Owain ] said
Michael wrote:
... 35 flat apartment block ...
it would cost something like 10,000 to rewire the building!


280 a flat. We were given a rough ballpark of 100 a flat for a door
entry system using existing cabling and mains supply so as you say
probably not unrealistic.


We did 72 flats across three buildings - new aerials and cables and the
addition of satellite dishes - for 100 a flat.
  #13  
Old September 17th 05, 01:11 AM posted to uk.tech.digital-tv
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Default Distributing digital signals in an apartment block


We did 72 flats across three buildings - new aerials and cables and the
addition of satellite dishes - for 100 a flat.


That's more like it.

Bill

  #14  
Old September 17th 05, 08:19 AM posted to uk.tech.digital-tv
Alan
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Default Distributing digital signals in an apartment block

In message .com,
" writes

Michael wrote:
We have been told by a local aerial
installer that this system would not be capable of distributing the
signals from a communal satellite dish to each flat for use in
individual sky receivers and that it would cost something like 10,000
to rewire the building! It is an old building which was converted in the
1980's with an emphasis on minimal costs for anything that wasn't
visible so the quote is probably not quite such a try on as it may
appear.

We've just completed a 36 dwelling 9 floor block. The invoice was for
5,700 + VAT. It was a difficult installation. Most installs are
cheaper per dwelling. At present we're doing a 76 outlet system that
has two CCTV camera and the bill will be about 10k.

Bill.
Where in the UK are you based? Alternatively, we are in Surrey. We
have a quote for 28 flats with 4 new external cables to each flat and
its a fair bit more than 160 per flat. Block is 3/4/5 stores in a
conservation area - we would get the planning application sorted out. 4
dishes feeding the kit, all satellites available to all outlets.


The same installer has also said that he believes the aerial
distribution system would have to be upgraded to distribute terrestrial
digital signals to receivers in each flat when they commence although he
seemed to think that the work required would be less costly.

You can't upgrade it because the problem, if there is one, is that the
cable is past it's useful life.

True in our case, 30+ years old and has a very low shielding factor.
Also attenuation at Sat Frequencies is very high!

--
Alan
  #15  
Old September 17th 05, 11:34 AM posted to uk.tech.digital-tv
spiney
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Default Distributing digital signals in an apartment block

Michael,

By now you're probably highly confused (!), so here's a definitive
answer ......

1) Digital tv is a "very different beast" from previous analogue
systems. With decreasing signals, you still get a perfect picture,
until at below a certain signal strength you suddenly get nothing! (see
my guide at
http://www.satellites.co.uk/php-bin/...ad.php?t=43646 ).

2) For terrestrial digital tv ONLY, when it arrives, you may need an
aerial upgrade, but the existing coax cables and UHF distribution
amplifiers ought to be fine for also delivering the newer digital
signals around the building. If you like, the amplifiers can be
replaced, that's fairly cheap, but shouldn't be necessary. Since
- if it works at all - digital tv always gives perfect pictures, in
fact there's no point in any upgrading!

3) If considering communal satellite reception, then that's always a
multiswitch system. Although commercial equipment exists for the
"headend" solution - that's "converting" limited satellite
channels to work on your existing cables and amps - it's vastly more
expensive, and not viable for several reasons (including legal ones).

4) Multiswitches use 5 "trunk" cables - 4 sat and 1 terr -
which must all be new! Higher quality satellite grade cable is required
for carrying the higher frequency satellite signals (they can also
carry lower frequency terrestrial, digital and analogue). This includes
the "endpoint feeds" into each flat, so none of the older cabling
or amplifiers can be reused. The most suitable type of multiswitch
system - cascade or standalone - would depend on your building
shape/size.

5) For SKY+, now becoming popular, you need 2 separate cables and 2
multiswitch outlets, per flat. On a standalone system, be careful to
include enough extra outlets for "probable future demand" (cascade
systems are easier to expand later on!). When the cabling is
installed, it's probably worth putting 2 into each flat (ie, one
"spare"), the extra expense being minimal, but later disruption
huge and expensive!

6) There are "satellite only" multiswitches - which may be
installed alongside an existing terrestrial system - leaving you with
2 cables into each flat! But.,there's no cost advantage in doing
that, so if upgrading just get the combined sat/terr system (1 cable
into each flat).

7) The equipment for your size of installation would typically cost
around 2000, including cables.

8) For professional installation, the quoted 10,000 is the going
rate. Some above posts suggest less, so good luck! The professional
aerial installation organisation is www.cai..org.uk .

9) There's no point in considering a partial upgrade. Most of the
cost is labour, and obviously it's best if the whole thing is done in
one go.

10) See my multiswitch guide at:
http://www.satellites.co.uk/php-bin/...ad.php?t=41947 .

11) Most UK sat multiswitch systems are for Sky only, what most people
want! However, there are other satellites - with many free and
subscription European channels - and equipment exists for communal
distribution of 2 satellites (rare in UK, fairly common continental
Europe).

12) It's possible to install DIY. Specialist knowledge is not
absolutely necessary (although, it would obviously help!). The f-plugs
used for joining the equipment to cables just screw on (or you can use
the handier "crimp" system) and you can get special "one
operation" cable strippers for tv coax, so all nice and easy, if a
bit tedious. The main constraint is a legal one, the system must be
properly earthed, all tv cables being individually earthed. Again,
there's "bits" for easily doing this - www.teldis.com make it
especially easy with Spaun equipment - and the system earth is
usually a copper water pipe.

13) For more "official" info on digital tv, see the dtg website,
at www.dtg,org.uk . If you look at the "publications" section,
there are downloadable files on communal antenna systems, which may be
helpful.

  #16  
Old September 17th 05, 11:56 AM posted to uk.tech.digital-tv
spiney
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Default Distributing digital signals in an apartment block

oops, I forgot ....

The multiswitch system distributes all the different tv signals around
the building! So, each resident just "plugs in" the appropriate type of
receiver, inside the flat. That's a "normal" tv, or a Freevew/Topup
"set top box" (or "integrated" tv), or a satellite receiver.

For satellite, you contact the Sky installer as usual, but they don't
have to errect a dish, of course, just plug it in!

("General purpose" satellite receivers are available,and will get all
the "free" Sky channels, but Sky use a unique proprietry encryption
system for their subscription channels, requiring a "digibox" type of
satellite receiver, usually supplied subsidised via their installers).

  #17  
Old September 17th 05, 12:03 PM posted to uk.tech.digital-tv
spiney
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Default Distributing digital signals in an apartment block

Sorry, above weblink should be www.cai.org.uk .

(I put in an extra dot!).

  #18  
Old September 17th 05, 12:05 PM posted to uk.tech.digital-tv
spiney
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Posts: 957
Default Distributing digital signals in an apartment block

sorry, yet another typing mistake!

That should have been www.dtg.org uk .

(dot, not comma!).

  #19  
Old September 17th 05, 12:18 PM posted to uk.tech.digital-tv
spiney
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Posts: 957
Default Distributing digital signals in an apartment block

Sorry, my typing is inexcusable!

My above URLs - web addresses - are correct, please "make valid" by
inserting the "dots" correctly on your web browser.

  #20  
Old September 17th 05, 01:01 PM posted to uk.tech.digital-tv
spiney
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Posts: 957
Default Distributing digital signals in an apartment block

And I've done it again, so multi-apologies.

My given URLs - web addresses - are fine, but my typing isn't, so on
your web browser please insert "single dots" in the appropriate places,
then it will work!

 




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