Signal Strength 10 - Quality 1

Yesterday the communal Aerial man came because I had complained. He checked
the roof aerial and all the connections between including the wall-plate and
said all seemed OK. My STB has a signal thingy on it and I showed him that
the Muxes beginning 2 i.e. 22 23 28 etc. were 10/10 Strength/Quality whereas
the 3's i.e. 32 34 etc. were p**s poor on the Quality side although 10 on
the strength side. He went back up and said he had tweaked and it should be
better - yes, look that's a decent picture you are getting. Anyway, today I
unplugged from the wall-plate and plugged into my own small aerial used for
the spare room. Shock. All the muxes showed 10/10. I phoned him back and he
said he would get back again tomorrow if possible. What on earth is going
on???
Crystal Palace direct un-obscured line of sight.
TIA


John the West Ham fan

"housetrained" wrote in message
...
Yesterday the communal Aerial man came because I had complained. He
checked
the roof aerial and all the connections between including the wall-plate
and
said all seemed OK. My STB has a signal thingy on it and I showed him that
the Muxes beginning 2 i.e. 22 23 28 etc. were 10/10 Strength/Quality
whereas
the 3's i.e. 32 34 etc. were p**s poor on the Quality side although 10 on
the strength side. He went back up and said he had tweaked and it should
be
better - yes, look that's a decent picture you are getting. Anyway, today
I
unplugged from the wall-plate and plugged into my own small aerial used
for
the spare room. Shock. All the muxes showed 10/10. I phoned him back and
he
said he would get back again tomorrow if possible. What on earth is going
on???
Crystal Palace direct un-obscured line of sight.
TIA


John the West Ham fan






Signal overload or picking up a reflection?

housetrained wrote:
Yesterday the communal Aerial man came because I had complained. He
checked the roof aerial and all the connections between including the
wall-plate and said all seemed OK. My STB has a signal thingy on it and
I showed him that the Muxes beginning 2 i.e. 22 23 28 etc. were 10/10
Strength/Quality whereas the 3's i.e. 32 34 etc. were p**s poor on the
Quality side although 10 on the strength side. He went back up and said
he had tweaked and it should be better - yes, look that's a decent
picture you are getting. Anyway, today I unplugged from the wall-plate
and plugged into my own small aerial used for the spare room. Shock. All
the muxes showed 10/10. I phoned him back and he said he would get back
again tomorrow if possible. What on earth is going on???
Crystal Palace direct un-obscured line of sight.
TIA


John the West Ham fan





The 'strength' reading can be misleading/irrelevant because
(a) The meters in receivers sometimes read max for a moderately poor
signal strength.
(b) The strength of the signal at your outlet is determined by the sum
effect of the amplification and signal losses on the system. If for
instance the signals were at a very low level for some reason at some
point in the chain and were then enormously amplified you would get a
strong but useless signal.

It sounds as if either
(a) The aerial is crap or the cable is waterlogged, so the installer is
increasing amplification, thus amplifying an unrecoverably weak signal
(b) There are channel filters fitted which are not passing all the
channels due to misalignement
(c) The filters are actually meant for the old analogue channels, so the
DTT is sneaking past them with varying degrees of success, the resultant
low levels being made up by amplification.
(d) the system uses channel conversion for analogue and this has not
been sorted out for DTT
(e) The signal at your outlet is getting there direct, rather than
through the system.
(f) The system has a ch37 aerial diplexed in for C5 (not unknown in
areas where analogue C5 comes from a different tx).

I don't understand the significance of:

Anyway, today I unplugged from the wall-plate
and plugged into my own small aerial used for the spare room. Shock. All
the muxes showed 10/10. I phoned him back and he said he would get back
again tomorrow if possible.

Bill

"Bill Wright" wrote in message
...
housetrained wrote:
Yesterday the communal Aerial man came because I had
complained. He checked the roof aerial and all the connections
between including the wall-plate and said all seemed OK. My
STB has a signal thingy on it and I showed him that the Muxes
beginning 2 i.e. 22 23 28 etc. were 10/10 Strength/Quality
whereas the 3's i.e. 32 34 etc. were p**s poor on the Quality
side although 10 on the strength side. He went back up and
said he had tweaked and it should be better - yes, look that's
a decent picture you are getting. Anyway, today I unplugged
from the wall-plate and plugged into my own small aerial used
for the spare room. Shock. All the muxes showed 10/10. I
phoned him back and he said he would get back again tomorrow
if possible. What on earth is going on???
Crystal Palace direct un-obscured line of sight.
TIA


John the West Ham fan





The 'strength' reading can be misleading/irrelevant because
(a) The meters in receivers sometimes read max for a moderately
poor signal strength.
(b) The strength of the signal at your outlet is determined by
the sum effect of the amplification and signal losses on the
system. If for instance the signals were at a very low level
for some reason at some point in the chain and were then
enormously amplified you would get a strong but useless signal.

It sounds as if either
(a) The aerial is crap or the cable is waterlogged, so the
installer is increasing amplification, thus amplifying an
unrecoverably weak signal
(b) There are channel filters fitted which are not passing all
the channels due to misalignement
(c) The filters are actually meant for the old analogue
channels, so the DTT is sneaking past them with varying degrees
of success, the resultant low levels being made up by
amplification.
(d) the system uses channel conversion for analogue and this
has not been sorted out for DTT
(e) The signal at your outlet is getting there direct, rather
than through the system.
(f) The system has a ch37 aerial diplexed in for C5 (not
unknown in areas where analogue C5 comes from a different tx).

I don't understand the significance of:

Anyway, today I unplugged from the wall-plate
and plugged into my own small aerial used for the spare room.
Shock. All
the muxes showed 10/10. I phoned him back and he said he
would get back
again tomorrow if possible.

Bill



You possibly missed on Bill.

There is no connection to the aerial system 'up top' and it is
just the downlead picking up the signal - albeit cross polarised.

Equally the wall-plate could be of the isolating variety and the
coupling cap is sc/oc/dj.


--
Woody

harrogate three at ntlworld dot com

Woody wrote:

It sounds as if either
(a) The aerial is crap or the cable is waterlogged, so the
installer is increasing amplification, thus amplifying an
unrecoverably weak signal
(b) There are channel filters fitted which are not passing all
the channels due to misalignement
(c) The filters are actually meant for the old analogue
channels, so the DTT is sneaking past them with varying degrees
of success, the resultant low levels being made up by
amplification.
(d) the system uses channel conversion for analogue and this
has not been sorted out for DTT
(e) The signal at your outlet is getting there direct, rather
than through the system.
(f) The system has a ch37 aerial diplexed in for C5 (not
unknown in areas where analogue C5 comes from a different tx).


You possibly missed on Bill.

There is no connection to the aerial system 'up top' and it is
just the downlead picking up the signal - albeit cross polarised.

Equally the wall-plate could be of the isolating variety and the
coupling cap is sc/oc/dj.

See my suggestion (e) above.

Bill

Overload somewhere in the system, possibly due to analogue channels?
The question is, did it ever work with quality 100 or not. If yes, then
something has definitely altered.

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!
"housetrained" wrote in message
...
Yesterday the communal Aerial man came because I had complained. He
checked the roof aerial and all the connections between including the
wall-plate and said all seemed OK. My STB has a signal thingy on it and I
showed him that the Muxes beginning 2 i.e. 22 23 28 etc. were 10/10
Strength/Quality whereas the 3's i.e. 32 34 etc. were p**s poor on the
Quality side although 10 on the strength side. He went back up and said he
had tweaked and it should be better - yes, look that's a decent picture
you are getting. Anyway, today I unplugged from the wall-plate and plugged
into my own small aerial used for the spare room. Shock. All the muxes
showed 10/10. I phoned him back and he said he would get back again
tomorrow if possible. What on earth is going on???
Crystal Palace direct un-obscured line of sight.
TIA


John the West Ham fan