Reception/picture quality problems since retune

Initially everything appeared to be OK after the retune - no stations
missing.

We get our signal from the Lancaster transmitter (Granada area via Winter
Hill)

Recently I have noticed that Five and ITV1 have intermittent pixilation of
the whole picture (I don't mean the break up that occurs due to
interference).

I checked the signal quality using the TV tuning menu. It seems that all
stations carried on the multiplex on Ch 22 (ITV1, ITV2, channel4, More4,
E4 and Five) have a lower signal quality than those carried on other
multiplexes.

Anyone else noticed this or have any comments?

The aerial is a new 18 element Group A with new downleads and no splitters.

--
John Aldred

John Aldred wrote:
Initially everything appeared to be OK after the retune - no stations
missing.

We get our signal from the Lancaster transmitter (Granada area via Winter
Hill)

Recently I have noticed that Five and ITV1 have intermittent pixilation of
the whole picture (I don't mean the break up that occurs due to
interference).

I checked the signal quality using the TV tuning menu. It seems that all
stations carried on the multiplex on Ch 22 (ITV1, ITV2, channel4, More4,
E4 and Five) have a lower signal quality than those carried on other
multiplexes.

Anyone else noticed this or have any comments?

The aerial is a new 18 element Group A with new downleads and no splitters.


I have lost ITV1 completely several times in the last few days. Re-tune
the set top boxes and back it comes. We get our signal from Crystal Palace.

On Sat, 10 Oct 2009 23:13:44 +0100, John Aldred wrote:

We get our signal from the Lancaster transmitter (Granada area via
Winter Hill)

....

It seems that all stations carried on the multiplex on Ch 22

Winter Hill does not broadcast a multiplex on channel 22.

Are you within range of Lancaster which does broadcast Multiplex 2
(ITV-1 Granada, ITV2, C4, More4) on channel 22?

On Sat, 10 Oct 2009 23:13:44 +0100, John Aldred wrote:

The aerial is a new 18 element Group A with new downleads and no
splitters.

Winter Hill requires a group C/D antenna (or for Winter Hill B something
which will go down to Ch40, perhaps only a wideband being suitable).

Are you sure you get your signal from Winter Hill and not Lancaster?

Are the elements on your antenna oriented horizontally or vertically?

On Sat, 10 Oct 2009 23:27:34 +0000 (UTC), J G Miller
wrote:

On Sat, 10 Oct 2009 23:13:44 +0100, John Aldred wrote:

We get our signal from the Lancaster transmitter (Granada area via
Winter Hill)

...

It seems that all stations carried on the multiplex on Ch 22

Winter Hill does not broadcast a multiplex on channel 22.

Are you within range of Lancaster which does broadcast Multiplex 2
(ITV-1 Granada, ITV2, C4, More4) on channel 22?

John said "We get our signal from the Lancaster transmitter".

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

On 11/10/09 00:27, J G Miller wrote:

On Sat, 10 Oct 2009 23:13:44 +0100, John Aldred wrote:

We get our signal from the Lancaster transmitter [snip]
on Ch 22

Are you within range of Lancaster which does broadcast
[snip] on channel 22?

Errm?

On Sat, 10 Oct 2009 23:30:36 +0000 (UTC), J G Miller
wrote:

On Sat, 10 Oct 2009 23:13:44 +0100, John Aldred wrote:

The aerial is a new 18 element Group A with new downleads and no
splitters.

Winter Hill requires a group C/D antenna (or for Winter Hill B something
which will go down to Ch40, perhaps only a wideband being suitable).

Are you sure you get your signal from Winter Hill and not Lancaster?

Are the elements on your antenna oriented horizontally or vertically?

Are you drunk???

"John Aldred" wrote in message
...
Initially everything appeared to be OK after the retune - no stations
missing.

We get our signal from the Lancaster transmitter (Granada area via Winter
Hill)

Recently I have noticed that Five and ITV1 have intermittent pixilation of
the whole picture (I don't mean the break up that occurs due to
interference).

I checked the signal quality using the TV tuning menu. It seems that all
stations carried on the multiplex on Ch 22 (ITV1, ITV2, channel4, More4,
E4 and Five) have a lower signal quality than those carried on other
multiplexes.

Anyone else noticed this or have any comments?

The aerial is a new 18 element Group A with new downleads and no
splitters.

I must apologise on behalf of some of my bretheren, who have replied in a
fatuous and unhelpful manner. You should not, perhaps, have posted on a
Saturday night. As a member of the UK.digital-tv temperance league I will
attempt to answer your question in a sober manner.

Ch22 is near the end of the band. See

http://www.wrightsaerials.tv/article...r-syndrome.pdf

There could be other reasons. UHF propagation is, in the real world,
intrinsically uneven and unpredictable.

Bill

"Bill Wright" wrote in message
...

"John Aldred" wrote in message
...
Initially everything appeared to be OK after the retune - no
stations
missing.

We get our signal from the Lancaster transmitter (Granada area
via Winter
Hill)

Recently I have noticed that Five and ITV1 have intermittent
pixilation of
the whole picture (I don't mean the break up that occurs due
to
interference).

I checked the signal quality using the TV tuning menu. It
seems that all
stations carried on the multiplex on Ch 22 (ITV1, ITV2,
channel4, More4,
E4 and Five) have a lower signal quality than those carried on
other
multiplexes.

Anyone else noticed this or have any comments?

The aerial is a new 18 element Group A with new downleads and
no splitters.

I must apologise on behalf of some of my bretheren, who have
replied in a fatuous and unhelpful manner. You should not,
perhaps, have posted on a Saturday night. As a member of the
UK.digital-tv temperance league I will attempt to answer your
question in a sober manner.

Ch22 is near the end of the band. See

http://www.wrightsaerials.tv/article...r-syndrome.pdf

There could be other reasons. UHF propagation is, in the real
world, intrinsically uneven and unpredictable.

Bill



Oh dear, I fear I may regret this, but I have to disagree with
you Bill. We ran links in the 450-470MHz band for decades without
problem and entirely predictably.

There will however be two major differences which support links
to the detriment of TV:-
TV aerials have to cover a wider band than a link aerial so will
possibly have less gain that is more uneven over the required
spectrum.
There will be far less fade margin on a TV signal. Links were run
at 26dB fade margin, I doubt a TV signal (save where you live
BIll!) will have a fraction of that.

But UHF propagation is almost entirely predictable.



--
Woody

harrogate three at ntlworld dot com

Well 22 is near the band edge compared to the others, maybe its just an
aerial issue at the band edge or the tuner is not very good at low
frequencies. I think you really need to try the box on another system and
see what happens.

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!
"John Aldred" wrote in message
...
Initially everything appeared to be OK after the retune - no stations
missing.

We get our signal from the Lancaster transmitter (Granada area via Winter
Hill)

Recently I have noticed that Five and ITV1 have intermittent pixilation of
the whole picture (I don't mean the break up that occurs due to
interference).

I checked the signal quality using the TV tuning menu. It seems that all
stations carried on the multiplex on Ch 22 (ITV1, ITV2, channel4, More4,
E4 and Five) have a lower signal quality than those carried on other
multiplexes.

Anyone else noticed this or have any comments?

The aerial is a new 18 element Group A with new downleads and no
splitters.

--
John Aldred