Running Coaxial Cable Outside

[Pierutrus]

Re: Running Coaxial Cable Outside

Jlinder,

You are mostly correct....
The MOST correct one to date!

Now a ?...
What's an LNA

Ever heard of a ParaClipsce!

Nice to see your input Jinder...
Keep up the good work.

 

[Pierutrus]

Re: Running Coaxial Cable Outside

Right. If they wanted to replace the drop for some reason or if a tree limb took it out. Having your stuff tied to theirs could create a problem.

Yes it would...

Do it on your own dime!

That means....Run your own as UnregisteredUser said!

Be safe...Not sorry.

 

[Gary H NC]

Re: Running Coaxial Cable Outside

There are 4 items to consider:

For the person running RG-59 for their dish - Dishes have an amplifier at the horn called the LNB. These help compensate for the loss in the cable. At the receiver you just need a signal that is high enough to feed the receiver.

The LNB is probably giving you enough signal so that you see no problems. On the other hand you might see less rain fade if you use the better cable. You will probably run into problems if you wanted to split the signal to 2 different receivers.

(The other problem with sat communications is the S/N ratio of the received signal. If everything else is working fine, like the cable run, when you experience rain fade or the dish moves the signal goes down. As long as you are above the threshold you should be fine. Since more and more sat signals are going digital you typically see no problems until you hit that threshold, then the signal dies quickly)

The LNB decides what polarity to use for each channel.
The Sat receiver feeds either 13 or 18 volts to the LNB depending on the channel.So like channel 100 is 13 volts,channel 101 is 18 volts and so on up through the channel range.They have always been a digital signal since the small type dishes came out.
The RG59 was never designed to carry voltage and the higher MHZ signal.
Thats also why you can not split any cable runs from the dish and feed 2 receivers.If you do both will only work on the 13 volt side or the 18 volt side at the same time.Thats why they designed the multi switch,2 leads from the LNB into the switch,one for 18 volt and the other line for 13 volts.The multi switch then feeds the needed signal to each receiver depending on what channel its on.
Its hard to explain but i had about 7 years training trouble shooting commercial sat. systems.I still have all my certifications and try to read up on it.
Any digital signal will either have picture or no picture at all. It looks the same at 100% signal strength that it does at 40% Until it gets so low it pixelizes and freezes.
Rain fade is mostly from out of adjustment dishes except for extremely heavy rain that just blocks the line of sight totally from the satellite.
The cable sheild is more critical to cable tv signals to keep bleed over from other signal types with analog.

jlinder is pretty well on target but the sat systems are a little more complicated...

 

[jlinder]

Re: Running Coaxial Cable Outside

Jlinder,

You are mostly correct....
The MOST correct one to date!

Now a ?...
What's an LNA

LNA = Low Noise Amplfier
LNB = Low Noise Block converter
LNC = Low Noise Converter

Signals received on a dish are extremely low level. An amplifier is placed right at the receive horn to offset this. (LNA)

Then you have the problem of xmitting the signal down the wire. C-band (4GHz) or Ku band (12GHz) does not like to go down wire. (waveguide is typically used at those frequencies). To get around that the amplifier is combined with a converter that takes the signals down to 900-1450MHz (L-band)

These amplifiers are also measured in how noisy they are (electrical noise). The lower the better. This is usually given in dB and is the ratio of the output noise of the amp to what you would get from a passive resister at the same temperature as the amp (typically referenced to about 290 deg Kelvin.)

Hope that is not too detailed.

 

[NSBCraig]

Re: Running Coaxial Cable Outside

Satellite and cable are completely different situations.

Your satellite is a closed system all on it's lonesome.

When you hook up to a cable system you are then part of that system.

Any cable you connect and the quantity of cables and jacks takes power from the neighborhood system.

This is why they charge for extra jacks.

It is not an infinite power source.

So if your cable installer says it's no good it's for a reason,showing him the door would be silly at best.

(Why would you even want to buy outdated technology and install it in your house)

 

[wuttja]

Re: Running Coaxial Cable Outside

A good place that I use to buy good quality cables for cheap is monoprice.com. They have RG6 coax here and all kinds of other fun cables. I had one cable that was bad, I emailed customer service and they immediately sent me a new one and just told me to toss the old one away. No questions asked, nothing to send back, just great service. I was stunned!
I don't know all the technicalities that the others referred to, but I know where to buy it!

 

[jlinder]

Re: Running Coaxial Cable Outside

But sat receivers and cable have the same principles. The receivers accept a fairly wide range of signal level.

The signal coming from the cable company is typically a good bit higher than the minimum needed. This gives them leeway in case the level drops or the various channels have some that are low, some high.

You can usually divide the signal in 2 - this is a 3DB loss . Fairly often you can go to a 4 way split with a 6DB loss without problems.

After that you probably want to look into an amp.

 

[muskyone]

Re: Running Coaxial Cable Outside

first off we do not use flooded cable for ariel use its for underground.
we dont use rg 59 anymore becuse of signal loss
signal leakage will mess up your internet or the guy next doors
dont attach to the exsisting drop with ty wraps if it hurts the drop and thay have to come out you will be charged im guessing you have charter call them and see how much thay would charge you to do it.
as a contractor that sweeps systems if i came through and your house had a problem id cut your drop down at the pole.
but 99 percent of the time if you use good rg6 good f fittings you should have no problems.

 

[ezbtr]

Re: Running Coaxial Cable Outside

wow what great info guys, but has anyone addressed proper grounding on outdoor cabling for electrical strikes?

 

[i386]

Re: Running Coaxial Cable Outside

wow what great info guys, but has anyone addressed proper grounding on outdoor cabling for electrical strikes?

Nope, but it's very important. Your cable guy will normally take care of this when the drop is installed. You should check though. If a suitable ground isn't nearby he may have skipped that step.