Cable length

A friend on mine has asked me to try and install a sky dish in his house
which has a large number of tall trees to the south. A Sky installer said
that it was not possible to get reception and walked away. However, a search
has found a spot where we might be able to 'see' the satellite. This
location is about 30 metres from the receiver. Has anybody got an opinion as
to if this length of cable is workable and what would be the best type to
use?
Regards
Roy Cook

Roy Cook wrote:
: to if this length of cable is workable and what would be the best type to
: use?

It certainly CAN be made to work! I once passed a farmhouse in Wales where
the Sky dish was on a pole at least this distance from the house -
presumably to clear the large hill to the south.

Forget shotgun cable and go for good quality discrete cables would seem
the best idea....but I am unsure of exact types!

There should be no problem with this sort of length. Make sure you use
real CT100 or preferably WF100 foam cored as it is more imune to water
ingress (although you should be making sure water can't get in it
anyway).
I have one customer running about 80M which works fine straight from
the LNB but LNB outputs do vary.
A dish one size up is a good idea as well.
You can use in-line amps for more length if required but dont overdo
it.
It is better to move even further away for a definite line of sight
rather than risk trees growing in the way
I prefer to do this sort of thing in the middle of summer when trees
are in full leaf, just to be sure.

I prefer to use the extra tough green buryable cable if it is to be
exposed over any long distance or certainly if it is to be buried but
it is about twice the price

"Roy Cook" wrote in message
...

A friend on mine has asked me to try and install a sky dish in his house
which has a large number of tall trees to the south. A Sky installer said
that it was not possible to get reception and walked away. However, a
search has found a spot where we might be able to 'see' the satellite.
This location is about 30 metres from the receiver. Has anybody got an
opinion as to if this length of cable is workable and what would be the
best type to use?
Regards
Roy Cook

Thanks for your help . Both posts are helpful and informative.

Regards
Roy Cook

On Mar 10, 11:05*pm, widgitt wrote:
There should be no problem with this sort of length. Make sure you use
real CT100 or preferably WF100 foam cored as it is more imune to water
ingress (although you should be making sure water can't get in it
anyway).
I have one customer running about 80M which works fine straight from
the LNB but LNB outputs do vary.
A dish one size up is a good idea as well.
You can use in-line amps for more length if required but dont overdo
it.
It is better to move even further away for a definite line of sight
rather than risk trees growing in the way
I prefer to do this sort of thing in the middle of summer when trees
are in full leaf, just to be sure.

I prefer to use the extra tough green buryable cable if it is to be
exposed over any long distance or certainly if it is to be buried but
it is about twice the price

As always I endorse all of Mr Widgett's sage advice. He certainly
knows his onions.

There should certainly be no problem with a 30m run. Most LNB outputs
are 25 to 30dB above receiver threshold. You wouldn't want to use all
that margin, but 30m of decent cable will only use about 10dB of it.
If you use ordinary cable (as opposed to 'direct burial' types), it
must not go anywhere where it is permanently damp. Remember that trees
move around in the wind so if you find the transition area between
'screened' and 'not screened' put the dish well away from it.

How many times have I heard the disconsolate wail "The Sky man says we
can't have Sky because of the trees!" On further questioning it often
turns out that the Sky man has also said that although reception is
definitely impossible a local installer might be able to do it. Just
as the religious believe that God is good but God is omninipotent and
therefore was responsible for your child getting cancer, the Sky man
is capable of an extraordinary 'double think'. He says one thing which
is the official line, and another which is the truth as he sees it.
But then again, don't we all? The hypocrisy of modern political
correctness can only be resolved for those in sensitive offices by the
adoption of twin moralities.Like a double line power inserter, there
has to be absolutely no crosstalk between the two channels or ugly
conflicts will arise. So in the office our man will blather all the
modern bull****, whilst in the company of trusted friends he will talk
like a normal person. If what he said in the office were to leak into
his private circle he would be held up to ridicule; if what he said in
his private circle was to leak into the office he would be dismissed.
We are in this respect no better than the Nazi or Soviet states. Have
I digressed, would you say? "A little!" is I hope your tactful reply.

Bill




Bill

On Wed, 10 Mar 2010 17:55:32 -0800, wrote:

If what he said in the office were to leak into his private
circle he would be held up to ridicule; if what he said in his private
circle was to leak into the office he would be dismissed.

Loose talk can cost lives.

http://farm3.static.flickr.COM/2287/2352744258_85f910419f.jpg

As always I endorse all of Mr Widgett's sage advice. He certainly
knows his onions.

There should certainly be no problem with a 30m run. Most LNB outputs
are 25 to 30dB above receiver threshold. You wouldn't want to use all
that margin, but 30m of decent cable will only use about 10dB of it.
If you use ordinary cable (as opposed to 'direct burial' types), it
must not go anywhere where it is permanently damp. Remember that trees
move around in the wind so if you find the transition area between
'screened' and 'not screened' put the dish well away from it.

Do bear in mind that the signal comes in at a higher angle that what the
dish -appears- to be looking at .. as it were...

--
Tony Sayer

Yes, and watch out for wildlife damage as it seems many small creatures like
the coating on cable.

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!
"widgitt" wrote in message
...
There should be no problem with this sort of length. Make sure you use
real CT100 or preferably WF100 foam cored as it is more imune to water
ingress (although you should be making sure water can't get in it
anyway).
I have one customer running about 80M which works fine straight from
the LNB but LNB outputs do vary.
A dish one size up is a good idea as well.
You can use in-line amps for more length if required but dont overdo
it.
It is better to move even further away for a definite line of sight
rather than risk trees growing in the way
I prefer to do this sort of thing in the middle of summer when trees
are in full leaf, just to be sure.

I prefer to use the extra tough green buryable cable if it is to be
exposed over any long distance or certainly if it is to be buried but
it is about twice the price

" wrote in message
...
On Mar 10, 11:05 pm, widgitt wrote:
There should be no problem with this sort of length. Make sure you use
real CT100 or preferably WF100 foam cored as it is more imune to water
ingress (although you should be making sure water can't get in it
anyway).
I have one customer running about 80M which works fine straight from
the LNB but LNB outputs do vary.
A dish one size up is a good idea as well.
You can use in-line amps for more length if required but dont overdo
it.
It is better to move even further away for a definite line of sight
rather than risk trees growing in the way
I prefer to do this sort of thing in the middle of summer when trees
are in full leaf, just to be sure.

I prefer to use the extra tough green buryable cable if it is to be
exposed over any long distance or certainly if it is to be buried but
it is about twice the price

As always I endorse all of Mr Widgett's sage advice. He certainly
knows his onions.

There should certainly be no problem with a 30m run. Most LNB outputs
are 25 to 30dB above receiver threshold. You wouldn't want to use all
that margin, but 30m of decent cable will only use about 10dB of it.
If you use ordinary cable (as opposed to 'direct burial' types), it
must not go anywhere where it is permanently damp. Remember that trees
move around in the wind so if you find the transition area between
'screened' and 'not screened' put the dish well away from it.

How many times have I heard the disconsolate wail "The Sky man says we
can't have Sky because of the trees!" On further questioning it often
turns out that the Sky man has also said that although reception is
definitely impossible a local installer might be able to do it. Just
as the religious believe that God is good but God is omninipotent and
therefore was responsible for your child getting cancer, the Sky man
is capable of an extraordinary 'double think'. He says one thing which
is the official line, and another which is the truth as he sees it.
But then again, don't we all? The hypocrisy of modern political
correctness can only be resolved for those in sensitive offices by the
adoption of twin moralities.Like a double line power inserter, there
has to be absolutely no crosstalk between the two channels or ugly
conflicts will arise. So in the office our man will blather all the
modern bull****, whilst in the company of trusted friends he will talk
like a normal person. If what he said in the office were to leak into
his private circle he would be held up to ridicule; if what he said in
his private circle was to leak into the office he would be dismissed.
We are in this respect no better than the Nazi or Soviet states. Have
I digressed, would you say? "A little!" is I hope your tactful reply.

Bill




Bill


It's rather appropriate that you signed that twice ;-)

--
Graham.

%Profound_observation%

On Wed, 10 Mar 2010 20:32:56 -0000, "Roy Cook"
wrote:


A friend on mine has asked me to try and install a sky dish in his house
which has a large number of tall trees to the south. A Sky installer said
that it was not possible to get reception and walked away. However, a search
has found a spot where we might be able to 'see' the satellite. This
location is about 30 metres from the receiver. Has anybody got an opinion as
to if this length of cable is workable and what would be the best type to
use?
Regards
Roy Cook

Others have come up with advice re the feasabilty of the project and
the type of cable to purchase and use.

I would only add that if I were doing this I would run in a spare
cable from the LNB to the house, sealing off the dish end.
--
Cheers

Peter