FreeSat Dish

"R. Mark Clayton" wrote in message
...

"Adrian" wrote in message
om...
Dhropta Guli wrote:
Is there a limit on the length of the cable from a sat dish to the
reciever? I'd like to install a dish at the bottom of my garden
(swimbo won't agree to anywhere else) but it's 75 feet from the
house. Would it work?
Ta
Bob

Dear Mr Guli

If the total cable length is 30 metres the loss at the top of the satellite
IF band will be 9dB if you use ordinary CT100 cable. This is negligible
because the LNB output exceeds the signal needed by the receiver by 25dB
approx. The loss with CT125 would be 7.5dB by the way. But you need to keep
the cable out of permanently damp places. If it is underground it will fail
gradually and will be no good after a few years. Thread it through a length
of 20mm blue alcathene water pipe, or run it along the fence.

Bill

"Bill Wright" wrote in message
...

"R. Mark Clayton" wrote in message
...

"Adrian" wrote in message
om...
Dhropta Guli wrote:
Is there a limit on the length of the cable from a sat dish to the
reciever? I'd like to install a dish at the bottom of my garden
(swimbo won't agree to anywhere else) but it's 75 feet from the
house. Would it work?
Ta
Bob

Dear Mr Guli

If the total cable length is 30 metres the loss at the top of the
satellite IF band will be 9dB if you use ordinary CT100 cable. This is
negligible because the LNB output exceeds the signal needed by the
receiver by 25dB approx. The loss with CT125 would be 7.5dB by the way.
But you need to keep the cable out of permanently damp places. If it is
underground it will fail gradually and will be no good after a few years.
Thread it through a length of 20mm blue alcathene water pipe, or run it
along the fence.

Bill

I forgot to say. If you do put the cable in a tube, ensure that water cannot
collect in a low point. In practice this means that there can't be a low
point unless it is drained.

Bill

In message , Bill Wright
writes

"Bill Wright" wrote in message
.. .

"R. Mark Clayton" wrote in message
...

"Adrian" wrote in message
om...
Dhropta Guli wrote:
Is there a limit on the length of the cable from a sat dish to the
reciever? I'd like to install a dish at the bottom of my garden
(swimbo won't agree to anywhere else) but it's 75 feet from the
house. Would it work?
Ta
Bob

Dear Mr Guli

If the total cable length is 30 metres the loss at the top of the
satellite IF band will be 9dB if you use ordinary CT100 cable. This is
negligible because the LNB output exceeds the signal needed by the
receiver by 25dB approx. The loss with CT125 would be 7.5dB by the way.
But you need to keep the cable out of permanently damp places. If it is
underground it will fail gradually and will be no good after a few years.
Thread it through a length of 20mm blue alcathene water pipe, or run it
along the fence.

Bill

I forgot to say. If you do put the cable in a tube, ensure that water cannot
collect in a low point. In practice this means that there can't be a low
point unless it is drained.

Bill

I've had 100' of old BICC 363 semi-airspaced coax (used for cable TV in
the early 60s) running down the garden for over 20 years, and is still
seems fine. Most is simply lying on the soil, beside a fence.

About 15' was buried in some garden hose. I needed to re-route this bit
and (not surprisingly) found the hose filled with water. Fortunately, I
had sealed the end of the coax before I pulled it out of the pipe.

I will replaced the coax in a buried duct consisting of a length of 68mm
drainpipe (downspout). This presently carries a long run of 1" flexible
piping which connects a rainwater interceptor in a downspout to a water
butt. The drainpipe will eventually also carry a low voltage DC cable.

Other than trying to prevent soil and stones from getting in the
drainpipe, I haven't tried to stop water getting in. I felt it would be
rather awkward to make a 100% seal. Instead, there is a deliberately
'leaky' joint in the centre, and the centre of the shallow trench (which
was dug for the drainpipe) is the lowest part of the underground run. To
act as a crude soakaway, beneath the join is about 6" depth of sand, so
hopefully, the joint will stay leaky, and the drainpipe will not fill
permanently fill with water.
--
Ian

Bill Wright wrote:

I forgot to say. If you do put the cable in a tube, ensure that water
cannot collect in a low point. In practice this means that there can't be
a low point unless it is drained.

Bill

A few years ago a friend of mine decided to put a sink in his workshop in
the basement. He ran the hot & cold pipes along the floor and up to the
taps, soldering the joints along the way. When he turned on the water
supply, he was annoyed to find a slight leak on one of the joints. He
turned off the supply, and then realised he hadn't put any drain taps in at
the lowest position. Just before this, his wife had asked their 6-year-old
son to "See how daddy was getting on". He returned to his mother looking
rather sheepish. When his mother asked him what had happened, he replied "I
heard the F word"!

--
Jeff

"Jeff Layman" wrote in message
...
Bill Wright wrote:

I forgot to say. If you do put the cable in a tube, ensure that water
cannot collect in a low point. In practice this means that there can't be
a low point unless it is drained.

Bill

A few years ago a friend of mine decided to put a sink in his workshop in
the basement. He ran the hot & cold pipes along the floor and up to the
taps, soldering the joints along the way. When he turned on the water
supply, he was annoyed to find a slight leak on one of the joints. He
turned off the supply, and then realised he hadn't put any drain taps in
at the lowest position. Just before this, his wife had asked their
6-year-old son to "See how daddy was getting on". He returned to his
mother looking rather sheepish. When his mother asked him what had
happened, he replied "I heard the F word"!

--
Jeff



Just siphon it out (or blow / suck).

"Ian Jackson" wrote in message
...
I've had 100' of old BICC 363 semi-airspaced coax (used for cable TV in
the early 60s) running down the garden for over 20 years, and is still
seems fine. Most is simply lying on the soil, beside a fence.
That's generally OK. It's when the cable is somewhere that never dries out
that the problems start.

Other than trying to prevent soil and stones from getting in the
drainpipe, I haven't tried to stop water getting in. I felt it would be
rather awkward to make a 100% seal. Instead, there is a deliberately
'leaky' joint in the centre, and the centre of the shallow trench (which
was dug for the drainpipe) is the lowest part of the underground run. To
act as a crude soakaway, beneath the join is about 6" depth of sand, so
hopefully, the joint will stay leaky, and the drainpipe will not fill
permanently fill with water.

I did one last year and we just dug a hole at the low point and filled it
with 3" limestone, and left a drain hole in the pipe.Thing is thougfh,
soakaways only work above the water table.

Bill

"R. Mark Clayton" wrote in message
...

"Jeff Layman" wrote in message
...
Bill Wright wrote:

I forgot to say. If you do put the cable in a tube, ensure that water
cannot collect in a low point. In practice this means that there can't
be
a low point unless it is drained.

Bill

A few years ago a friend of mine decided to put a sink in his workshop in
the basement. He ran the hot & cold pipes along the floor and up to the
taps, soldering the joints along the way. When he turned on the water
supply, he was annoyed to find a slight leak on one of the joints. He
turned off the supply, and then realised he hadn't put any drain taps in
at the lowest position. Just before this, his wife had asked their
6-year-old son to "See how daddy was getting on". He returned to his
mother looking rather sheepish. When his mother asked him what had
happened, he replied "I heard the F word"!

We've got a section of heating pipe in the basement that's below all the
drain cocks. When the radiators have needed to come off we've just accepted
the mopping up. I used to have a problem with the motorhome, in that the low
point never drained and in winter would damage the pump. So we fitted a
drain next to the pump, and no run the motor till all is dry.

Bill

Is there a limit on the length of the cable from a sat dish to the
reciever? I'd like to install a dish at the bottom of my garden (swimbo
won't agree to anywhere else) but it's 75 feet from the house. Would it
work?
Ta
Bob

Adrian wrote:
Dhropta Guli wrote:
Is there a limit on the length of the cable from a sat dish to the
reciever? I'd like to install a dish at the bottom of my garden
(swimbo won't agree to anywhere else) but it's 75 feet from the
house. Would it work?
Ta
Bob

Shouldn't be a problem if you use decent quality coax. It would be a good
idea to put it in some conduit, maybe a length of garden hose.
That's what I was hoping to hear, thanks.
Slightly OT, I an replying to your post but my original post isn't
visible to me, I can usually see my own posts!