Blackhill Mux 6 problems
Donald Whannell
Blackhill, in particular around the Neilston area?
Since installing a Pace decoder over a year ago the channels on this mux
have frequently been unwatchable. I assumed this was just an aerial
problem since I believe the aerial group has now changed for digital
viewers. A couple of weeks ago I installed a wideband high gain aerial,
whats really embarrassing is that from the top of the ladder I realised I
could actually SEE the blackhill mast on the horizon. I now suspect the
problem lies elsewhere, initial tests still seem to show occasional
pixelisation on the channels on mux 6, all others are fine.
Anybody with similar problems in this area? Perhaps its a God send, who
wants to watch Carlton Food anyway :-)
Donald
Symanski
ground in the transmission path. What was your analogue picture like? Any
good? Digital still needs to have a good feed.
J.
PS, not on the Blackhill transmitter - Darvel's mine!
Donald Whannell
sight to blackhill. My analogue picture is as good as you get. Infact if
I was being picky I could probably argue that the analogue picture is better
if you take into account degradation from the compression process :-) Its
all a bit of a mystery. It could also be some sort of local interference
close that that Mux frequency since it seems intermittent.
Donald
"Symanski" <syma...@mumbas.free-online.co.uk> wrote in message
news:39025D35...@mumbas.free-online.co.uk...
Alexander Urbanowski
a booster, never had a problem with signal strength for the other muxes
(always 4.5/5), even without the booster. It's just mux d that always
seems to have the poor signal here.
BTW do you still run the BBS? ;-)
cheers
Alex
Anon
Bishopbriggs.
Problem 1. - When I had the UHF aerial lead hooked into the digibox (Phillips)
to video to tv and the scart from digibox to tv and digibox to video I lost
muxes B & C, which was quite a feat !
It seems likely that I was creating a closed loop which was causing the
digibox some serious grief.
Have you tried disconnecting everything apart from your TV and Digibox and
tried retuning to see if you get a stronger signal ?
Mux D is gone until I replace my loft aerial.
Cheers,
John
Symanski
signal. What happens with any line of sight transmission is that there is a
reception path directly between receiver and transmitter, plus at least one
reflection off the ground. But, this reflection might also come from a hill or
building. You state that it is intermittent, does this depend on the local
weather conditions? This should indicate that its reflections that's causing
the problem (the efficiency of the reflection can vary in these conditions).
They can also be frequency dependant.
What can you do? Normally you'd put a higher gain ariel up, but you've aready
done that. Perhaps you could try to move the ariel slightly off axis, adjust
the height of the ariel, or even the position on your building.
I know about these problems, but the uni didn't tell my how to fix them!
Bleeding useless.....
J.
Donald Whannell wrote:
> Could be reflections from buildings, as I mentioned I have a direct line of
> sight to blackhill. My analogue picture is as good as you get. Infact if
> I was being picky I could probably argue that the analogue picture is better
> if you take into account degradation from the compression process :-) Its
> all a bit of a mystery. It could also be some sort of local interference
> close that that Mux frequency since it seems intermittent.
>
> Donald
>
> "Symanski" <syma...@mumbas.free-online.co.uk> wrote in message
> news:39025D35...@mumbas.free-online.co.uk...
> > The problem might be that you're getting some reflections etc from hills
> and
> > ground in the transmission path. What was your analogue picture like?
> Any
> > good? Digital still needs to have a good feed.
> >
> > J.
> >
> > PS, not on the Blackhill transmitter - Darvel's mine!
> >
Symanski
Anon wrote:
>
> Mux D is gone until I replace my loft aerial.
AAAAAAARRRRRRRRRRRHHHHHHHHH!!!!!!!!!
Ditch the loft aerial. You need a CLEAR path to the transmitter.
J.
Donald Whannell
elastic band on it as we speak.
The BB closed a couple of years ago, it started getting a bit lonely because
everybody including myself was on here....... its also a tad better now that
its free access all the way with this.
Check out www.neilstonwebcam.com if you can't find any drying paint that
requires watching :-)
Donald
"Alexander Urbanowski" <alex.ur...@virgin.net> wrote in message
news:39032B3D...@virgin.net...
> I'm in Thornliebank and can only get a 'satisfactory' mux d signal with
> a booster, never had a problem with signal strength for the other muxes
> (always 4.5/5), even without the booster. It's just mux d that always
> seems to have the poor signal here.
>
> BTW do you still run the BBS? ;-)
>
> cheers
> Alex
>
>
>
>
>
John Smith
an indoor wire loop aerial ( you know the nasty things that come free with
portables !)
My Father who lives a few miles closer to Blackhill has had horrendous
problems with blocking on a Philips STB, using a loft aerial. Although the
signal strength is good and clear, I do notice some slight ghosting on his
analogue signal which I reckon is down to the loft mounted aerial and
spurious reflections.
On swapping it for a Nokia I found that I lost the ITV mux, with only 1.5
red showing for the mux. Turned out the UHF output channel was set to ch47,
the same frequency as the ITV mux and was causing interference, despite
using Scarts only and no UHF. I did not discover this until I had spent an
hour adjusting the aerial; so check that it is set for something like 21 or
69 ! Setting this at 21 brought the ITV mux (ch47) back to 4 !
Another thing is that his original basic aerial (black dot) could not pick
up mux 6 (ch65) strong enough, so it was changed for a wideband type (yellow
dot).
My Mother-in-law has a Nokia STB, roof-mounted bog-standard aerial and lives
on the Southside of Glasgow. Her signal is weaker at around 4, but with 3.5
to 4 on Mux 6.
BTW if you don't know the frequencies try these on your signal meter:
41 47 51 55 65
Rgds
JP