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Guest
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 Posted:
Fri Aug 26, 2005 12:08 am Post subject:
Maximum distance dish to tv?? |
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| Quote: | From my house I have no clear views of the southern sky to mount a
Directv dish--- all views are blocked by large trees. My only |
options-- other than clear cutting-- are to place the dish 50-75 yards
away. Question: At that distance will the signal from the dish to the
tv receiver be sufficient? I asked tech support at Directv and the
didn't know! |
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Seth
Guest
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| Posted:
Fri Aug 26, 2005 12:08 am Post subject:
Re: Maximum distance dish to tv?? |
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<Pelorus@gmail.com> wrote in message
news:1125007631.793321.177890@o13g2000cwo.googlegroups.com...
| Quote: | From my house I have no clear views of the southern sky to mount a
Directv dish--- all views are blocked by large trees. My only
options-- other than clear cutting-- are to place the dish 50-75 yards
away. Question: At that distance will the signal from the dish to the
tv receiver be sufficient? I asked tech support at Directv and the
didn't know!
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Should work fine. May want to use RG-11 for that long of a run though. |
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Guest
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| Posted:
Sat Aug 27, 2005 5:38 am Post subject:
Re: Maximum distance dish to tv?? |
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As long as you use a good quality RG 6 coax, you'll be fine.
I've done a few over 350 feet that work just fine -- longest is 435 feet.
<Pelorus@gmail.com> wrote in message
news:1125007631.793321.177890@o13g2000cwo.googlegroups.com...
| Quote: | From my house I have no clear views of the southern sky to mount a
Directv dish--- all views are blocked by large trees. My only
options-- other than clear cutting-- are to place the dish 50-75 yards
away. Question: At that distance will the signal from the dish to the
tv receiver be sufficient? I asked tech support at Directv and the
didn't know!
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Timothy Daniels
Guest
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| Posted:
Sat Aug 27, 2005 8:08 am Post subject:
Re: Maximum distance dish to tv?? |
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How is he supposed to know what "good quality" RG6 coax is?
What brands are "good quality"? Which lines within those brands
are "good quality"?
*TimDaniels*
<agnesspor@comcast.net> wrote:
| Quote: | As long as you use a good quality RG 6 coax, you'll be fine.
I've done a few over 350 feet that work just fine -- longest is 435 feet.
Pelorus@gmail.com> wrote:
From my house I have no clear views of the southern sky to mount a
Directv dish--- all views are blocked by large trees. My only
options-- other than clear cutting-- are to place the dish 50-75 yards
away. Question: At that distance will the signal from the dish to the
tv receiver be sufficient? I asked tech support at Directv and the
didn't know! |
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Greywolf
Guest
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| Posted:
Sat Aug 27, 2005 4:08 pm Post subject:
Re: Maximum distance dish to tv?? |
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<satman@copper.net> wrote in message news:43106233_4@newsfeed.slurp.net...
| Quote: | You should use SOLID COPPER center conductor RG6 . Do not use the copper
plated steel center conductor cable.
That's good advice for really long runs. The OPs run is well under the 200ft |
or so where the need may arise.
Pat |
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Guest
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| Posted:
Sat Aug 27, 2005 4:08 pm Post subject:
Re: Maximum distance dish to tv?? |
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You should use SOLID COPPER center conductor RG6 . Do not use the copper
plated steel center conductor cable. |
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Timothy Daniels
Guest
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| Posted:
Sat Aug 27, 2005 11:36 pm Post subject:
Re: Maximum distance dish to tv?? |
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<satman@copper.net> wrote:
| Quote: | You should use SOLID COPPER center conductor RG6 . Do not use the copper
plated steel center conductor cable.
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Solid copper center conductor helps with DC and 60Hz AC power
transmittal to the LNBs and for multiswitch signaling if the multiswitch
is at the dish. And it also helps in those cases if the braid shield
(the other half of the power circuit) is copper, too (it usually is).
But solid copper conductors matter not a whit at 1-2GHz, the range
of the signals coming from the LNBs. At those frequencies, the
signals travel virtually entirely on the surface of a conductor, and
solid copper is a waste of money.
Of more importance at those frequencies is the continuity of
impedance along the cable - which puts emphasis on the F-
connectors, the consistency of the foam dielectric, and the
lack of tight bends and pressure points along the length of
the cable. Water ingress at weather-caused cracks and bad
connections is also a factor. The factors under most control
by the installer are the F-connectors, bend radii, and the lack
of pressure points.
Good F-connectors are the compression-fit type, with brand
names such as Snap-N-Seal and Digicaon. These connectors
put an even pressure around the cable sheath to prevent the
sharp pressure points which cause impedance discontinuities. -
which in turn cause signal reflections in the cable. They also
have seals which keep water out of the connection. The big
cable companies are even using these now although they
don't the higher frequencies (and higher sensitivity to impedance
discontinuities) that satellite installations do. The compression-
fit connectors do cost more, and the application tools cost a
*lot* more than those for the crimp-fit connectors, but the cable
and the satellite companies feel they're worth the expense.
The cable manufacturers also recommend that bends in the
installed cable are no tighter than bends having radii less than
10 times the diameter of the cable. Since average RG6 has
a diameter of about 0.25", the recommended bend radius
should be no tighter than 2.5" - or about the curvature of a CD's
outer edge. If you can always fit a CD inside the curvature of
a cable bend, it meets specs. The problem with a bend is that
it causes the center conductor to gradually migrate through the
foam, changing a localized change in the density of the foam
and a change in the distance between the center and outer
conductors - both affecting the local impedance.
Pressure points can also be caused by tight staples and tight
cable ties. If you find during installation that the cable cannot
slip freely back and forth under a staple or a cable tie, it's too
tight. Better than staples from a staple gun - even those which
have a plastic sheath over the staple - are the small plastic
blocks that have one or two brads to attach it to a wall or molding.
They distribute the hold-down pressure over a broader area
and are less likely to put a dimple in the cable sheath.
In short, the installation techniques themselves have a great
influence over the signal propagation along a cable in the
range of 1-2 GHz, and those techniques are under the control
of the installer.
*TimDaniels* |
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AGN
Guest
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| Posted:
Mon Aug 29, 2005 7:25 am Post subject:
Re: Maximum distance dish to tv?? |
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"Timothy Daniels" <TDaniels@NoSpamDot.com> wrote in message
news:H46dnRZY3ZQTc5LeRVn-tw@comcast.com...
| Quote: | How is he supposed to know what "good quality" RG6 coax is?
What brands are "good quality"? Which lines within those brands
are "good quality"?
|
Gee, I don't know, maybe do some research like on that deal called the
internet?
| Quote: | *TimDaniels*
agnesspor@comcast.net> wrote:
As long as you use a good quality RG 6 coax, you'll be fine.
I've done a few over 350 feet that work just fine -- longest is 435 feet.
Pelorus@gmail.com> wrote:
From my house I have no clear views of the southern sky to mount a
Directv dish--- all views are blocked by large trees. My only
options-- other than clear cutting-- are to place the dish 50-75 yards
away. Question: At that distance will the signal from the dish to the
tv receiver be sufficient? I asked tech support at Directv and the
didn't know!
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Timothy Daniels
Guest
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| Posted:
Mon Aug 29, 2005 8:08 am Post subject:
Re: Maximum distance dish to tv?? |
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This *is* the Internet! If *you* can't say what "good quality"
cable is and how to find it, how is someone who knows
even less than you supposed to find out?
*TimDaniels*
"AGN" replied:
| Quote: | Gee, I don't know, maybe do some research like on that
deal called the internet?
"Timothy Daniels" wrote:
How is he supposed to know what "good quality" RG6 coax is?
What brands are "good quality"? Which lines within those brands
are "good quality"?
*TimDaniels*
agnesspor@comcast.net> wrote:
As long as you use a good quality RG 6 coax, you'll be fine.
I've done a few over 350 feet that work just fine -- longest is
435 feet.
Pelorus@gmail.com> wrote:
From my house I have no clear views of the southern sky to
mount a Directv dish--- all views are blocked by large trees.
My only options-- other than clear cutting-- are to place the
dish 50-75 yards away. Question: At that distance will the
signal from the dish to the tv receiver be sufficient? I asked
tech support at Directv and the didn't know! |
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AGN
Guest
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| Posted:
Mon Aug 29, 2005 8:08 am Post subject:
Re: Maximum distance dish to tv?? |
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"Timothy Daniels" <TDaniels@NoSpamDot.com> wrote in message
news:vqWdnaQLUJRqDY_eRVn-3g@comcast.com...
| Quote: | This *is* the Internet!
|
Boy are you sharp!
If *you* can't say what "good quality"
| Quote: | cable is and how to find it, how is someone who knows
even less than you supposed to find out?
|
If they can't figure it out, they can call a local satellite dealer who will
know.
| Quote: |
*TimDaniels*
"AGN" replied:
Gee, I don't know, maybe do some research like on that
deal called the internet?
"Timothy Daniels" wrote:
How is he supposed to know what "good quality" RG6 coax is?
What brands are "good quality"? Which lines within those brands
are "good quality"?
*TimDaniels*
agnesspor@comcast.net> wrote:
As long as you use a good quality RG 6 coax, you'll be fine.
I've done a few over 350 feet that work just fine -- longest is
435 feet.
Pelorus@gmail.com> wrote:
From my house I have no clear views of the southern sky to
mount a Directv dish--- all views are blocked by large trees.
My only options-- other than clear cutting-- are to place the
dish 50-75 yards away. Question: At that distance will the
signal from the dish to the tv receiver be sufficient? I asked
tech support at Directv and the didn't know!
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Pelorus
Guest
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| Posted:
Tue Aug 30, 2005 9:38 pm Post subject:
Re: Maximum distance dish to tv?? |
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Tim:
Thank you for the thoroughness of your reply. It gives me confidence
that I can install a Directv system eventhough I have a long run from
dish to tv. Having 3 tv channels with marginal signals at my home in
Southern Vermont has gotten old.
Thanks to all taking the time to respond-- Directv was of little help. |
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Timothy Daniels
Guest
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| Posted:
Tue Aug 30, 2005 10:18 pm Post subject:
Re: Maximum distance dish to tv?? |
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"Pelorus" wrote:
| Quote: | Directv was of little help.
|
Sad, but true. And... there are sound business reasons
for that. DirecTV (like DishNetwork) depends on installers
since most people wouldn't try to install their own dish and
cabling, and DTV and Dish wouldn't want to cut into their
installers' incomes by educating DIYers. Furthermore, it
would cost money to have knowledgeable tech support
personnel to answer the inevitable questions from DIYers
even if the satellite providers offerred a thorough and well
composed tutorial manual at a nominal fee to DIYers. Add
to that liability for installations botched by DIYers and to
accidents causing injury to DIYers as they climb on roofs
and poles to mount their dishes. It's just a no-win situation
for the satellite companies.
And, in the case of multi-dwelling unit (MDU) installations,
such as condo buildings and hotels, both DTV and Dish
*depend* on their professional trained-and-licensed installers
to handle the complex designs for signal management that are
characteristic of such systems. They are so dependent that
they *require* that it be done by specifically MDU-licensed
installers.
In short, the satellite companies really WANT you to use
a professional installer, and they feel that a professionally
installed reception system is in everyone's best interest.
Of course, WE know that we can do a better job that most
professional single family home installers because we can
take more time and we care more, but the satellite companies
have to look at the population as a whole, and the average
DIYer would just produce a kludge that someone else would
have to diagnose and correct, and the satellite company in
the meantime would be blamed for providing a bad signal
and/or bad instructions. So..., we have newsgroups.
*TimDaniels* |
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