DTT signal strength.

I understand from press articles I have read recently that when there is a
cessation of analogue transmissions, the strength of the digital signals
will be increased considerably. Does this mean that lots of poor people will
have spent good money on renewing aerials, when this would not have been
neccessary had the present signals been of the strength they will be in due
course?


AJM.

On Fri, 9 Sep 2005 19:43:18 +0000 (UTC), "AJM"
wrote:

| I understand from press articles I have read recently that when there is a
| cessation of analogue transmissions, the strength of the digital signals
| will be increased considerably. Does this mean that lots of poor people will
| have spent good money on renewing aerials, when this would not have been
| neccessary had the present signals been of the strength they will be in due
| course?

Whatever happens I will get several years Freeview viewing for my money
spent on aerials etc.

--
Dave Fawthrop dave hyphenologist co uk
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.

On Fri, 9 Sep 2005 19:43:18 +0000 (UTC), "AJM"
wrote:

I understand from press articles I have read recently that when there is a
cessation of analogue transmissions, the strength of the digital signals
will be increased considerably. Does this mean that lots of poor people will
have spent good money on renewing aerials, when this would not have been
neccessary had the present signals been of the strength they will be in due
course?


AJM.

AIUI that is exactly what will happen. More than that, at the moment
digital aerials often have to point at the main transmitter rather
than the local relay. When the analogue service ends many if not all
relays will carry digital services so basic aerials - maybe even
internal aerials - should be okay.

However, I want the service now not in a few years time so I am happy
to pay for an aerial. Cheaper than a Sky subscription.

Scott

In message , AJM
wrote
I understand from press articles I have read recently that when there is a
cessation of analogue transmissions, the strength of the digital signals
will be increased considerably. Does this mean that lots of poor people will
have spent good money on renewing aerials, when this would not have been
neccessary had the present signals been of the strength they will be in due
course?

According to some electronic goods (TVs) advertising delivered by the
Royal Mail junk mail delivery service analogue TV is going to be
switched off in 2008.
--
Alan

"Alan" wrote in message
...
In message , AJM
wrote
I understand from press articles I have read recently that when there is a
cessation of analogue transmissions, the strength of the digital signals
will be increased considerably. Does this mean that lots of poor people will
have spent good money on renewing aerials, when this would not have been
neccessary had the present signals been of the strength they will be in due
course?

According to some electronic goods (TVs) advertising delivered by the
Royal Mail junk mail delivery service analogue TV is going to be
switched off in 2008.

The proposed cut off dates depend on which part of the country you are in.
London is last!

--

Michael Chare

On 2005-09-09, AJM wrote:
I understand from press articles I have read recently that when there is a
cessation of analogue transmissions, the strength of the digital signals
will be increased considerably. ...

This is true. And in many cases, AIUI, the digital TV channels will
be moved to occupy the channels vacated by the analogue TV signals.
This will, in many cases, allow existing grouped aerials to work for
digital rather than requiring a wideband aerial.

... Does this mean that lots of poor people will
have spent good money on renewing aerials, when this would not have been
neccessary had the present signals been of the strength they will be in due
course?

The answer to the question is yes. However the digital TV signals cannot
be made any higher in power at the moment because that would interfere
with the existing analogue TV signals.

Also in many cases today's low power digital TV cannot be put into the
same channel group as existing analogue TV channels, because this too
will cause interference [1]. This means that many people who want digital
TV today need a wideband aerial rather than an existing grouped aerial.

However, for many, if they are prepared to wait some years for the
switchover to get digital TV, they will be able to use an existing aerial
(if it remains in good condition).

[1] There are some exceptions including Crystal Palace.

--
John Phillips

John Phillips wrote:
On 2005-09-09, AJM wrote:

Also in many cases today's low power digital TV cannot be put into the
same channel group as existing analogue TV channels, because this too
will cause interference [1].

[1] There are some exceptions including Crystal Palace.

Adjacent channel working was a planning pre-requisite for DTT implementation,
and is used for at least one mux at the *majority* of transmitter sites. In
fact the use of these 'taboo' channels in the analogue frequency plan has
enabled DTT services to be introduced in the UK.

It is true to say that early DTT receivers did not perform well receiving muxes
that were adjacent to a powerful analogue neighbour, and at relevant
transmitter sites the vestigial sideband roll off of the analogue vision
carrier has also had to be modified.


--
Mark
Please replace invalid and invalid with gmx and net to reply.

Adjacent channel working was a planning pre-requisite for DTT implementation,
and is used for at least one mux at the *majority* of transmitter sites. In
fact the use of these 'taboo' channels in the analogue frequency plan has
enabled DTT services to be introduced in the UK.

It is true to say that early DTT receivers did not perform well receiving muxes
that were adjacent to a powerful analogue neighbour, and at relevant
transmitter sites the vestigial sideband roll off of the analogue vision
carrier has also had to be modified.


--
Mark

Not long ago a lad from the IDTV manufacturer went out to one of my
customers with a spectrum analyser. He squinted at the screen and told
my customer that the trouble was caused by the fact that the analogue
signal was adjacent to the digital one. I was then summoned to recify
this fault in my installation!

Bill