sky signal

bigtank

Standard Member
hi
I just recabled my grundig sky digital box and the signal quality and strength are now reading only 30% to 40%,before they both were 100%.
any ideas
I am sure the dish was not moved and I refitted two new connectors.

thanks
 

lynx

Senior Moderator
What cable was used for the re-wire ?
 

bigtank

Standard Member
hi
I am sorry i dont know what kind of cable
it was purchased at a local electrical supplier.
it was like coxial only it was encased in silver foil
 

GGTVBD

Well-known Member
Sounds like you've used satellite cable, albeit 'average' quality RG6. That shouldn't make a noticeable difference to the signal levels though.

Are you sure you didn't move the dish slightly? A millemetre or two can make all the difference and would explain the losses.

A. Dork
 

bigtank

Standard Member
hi
there is a plastic casting around the LNB which I did fiddle with to gain access to unscrew the connector. ????
 
A

andyAV

Guest
I guess the plastic casting was the "rubber boot" usually used to prevent water getting into the F-connector where it joins the LNB. If you struggled with it you could have dislodged the dish though it should be more securely fixed than that.

If the cable run is very long it could be the cable - the silver foil (actually aluminium) isn't the best shield. Is there any copper braid over the top - if not it's poor cable. The other thing to check is that you have got the foil/braid shield in contact with the outer part of the F connector body otherwise it's not earthed and won't act as the shield and ensure that the shield is not in contact with the solid core.

Another good possibility is that you've kinked the cable somewhere by bending it too abruptly / twisted it etc. Most coax is air spaced rather than foam and can be kinked fairly easily breaking either the core or the shield making for an iffy connection.

Andy
 

bigtank

Standard Member
hi andy
the cable has foil and copper braid,I will check the connectors again
does the foil and braid both have to be in contact with outer body as I cut the foil off and have just the braid in contact

thanks
 

GGTVBD

Well-known Member
andyAV said:
I guess the plastic casting was the "rubber boot" usually used to prevent water getting into the F-connector where it joins the LNB. If you struggled with it you could have dislodged the dish though it should be more securely fixed than that.

If the cable run is very long it could be the cable - the silver foil (actually aluminium) isn't the best shield. Is there any copper braid over the top - if not it's poor cable. The other thing to check is that you have got the foil/braid shield in contact with the outer part of the F connector body otherwise it's not earthed and won't act as the shield and ensure that the shield is not in contact with the solid core.

Another good possibility is that you've kinked the cable somewhere by bending it too abruptly / twisted it etc. Most coax is air spaced rather than foam and can be kinked fairly easily breaking either the core or the shield making for an iffy connection.

Andy

Good points - but

1. Rubber boots haven't been used for a few years now. The F connector should have been sealed with self amalgamating tape. The plastic casing is the shell of the LNB.
2. The cable 'bigtank' has used is adequate for the job and is used by a large number of installers.
3. "The other thing to check is that you have got the foil/braid shield in contact with the outer part of the F connector body otherwise it's not earthed and won't act as the shield" Cobblers! :D If it's not connected - it won't work at all! :D
4. "Another good possibility is that you've kinked the cable somewhere by bending it too abruptly / twisted it etc. Most coax is air spaced rather than foam and can be kinked fairly easily breaking either the core or the shield making for an iffy connection." - Possible - but if the centre core is broken it won't give you any signal.

bigtank - you've moved the dish - guaranteed. As I say, only a few mil, but I bet you have.

A. Dork
 

bigtank

Standard Member
hi arthur
the dish and system is one of the first sky digital systems and has been in use for quite a few years.
how can i check it has moved and how can i fix it

thanks
 

Nick_UK

Banned
He might have rotated the LNB a little.
 
R

robwri35

Guest
I have a Grundig GDS 200/1 and i too have a satellite dish (duh!) but when i had 2 Amstrad DRX 100's (not the best due to tuner breakage) i could get about 70% Signal Quality. Now though, on my Grundig all i can get is 40%, 50% is i spend hours trying to get it bang on.

So its either,

a) My cable is damaged and should be replaced with a better one
b) my Cambridge lnb has lost the plot and needs replacing
c) My digibox has lost the will to live and isnt decoding channels properly so it needs replacing
or
d) i go back to ntl: (but im not THAT desperate)
 

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