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1GHz or 2GHz Splitter

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Old 12-25-2009, 12:21 PM   #1
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Default 1GHz or 2GHz Splitter

When would I use a 1GHz splitter and When would I use a 2GHz splitter?
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Old 12-25-2009, 01:20 PM   #2
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What frequencies are you working with?

OTA is all under 1 GHz.
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Old 12-25-2009, 01:54 PM   #3
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What frequencies are you working with?

OTA is all under 1 GHz.
It would be for OTA. Would there be some reason not to use a 2 GHz splitter as apposed to a 1 GHz? 8 Way is what I am looking into. I still am not sure about the 8 way splitter with a amplifier. Meaning they put out from what I can till about 3.5 db from each port but is it 3.5 or 3.5 onto of what is coming into the splitter if you are using a antenna amp?
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Old 12-25-2009, 02:39 PM   #4
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It would be for OTA. Would there be some reason not to use a 2 GHz splitter as apposed to a 1 GHz?
No reason not to, other than it may cost you a bit more. I think a 2 GHz splitter will handle the higher freq's of some cable TV transmissions???

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8 Way is what I am looking into. I still am not sure about the 8 way splitter with a amplifier. Meaning they put out from what I can till about 3.5 db from each port but is it 3.5 or 3.5 onto of what is coming into the splitter if you are using a antenna amp?
Not sure what you're trying to say here - are we having a little Christmas cheer? lol
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Old 12-25-2009, 04:38 PM   #5
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Originally Posted by cush42 View Post
It would be for OTA. Would there be some reason not to use a 2 GHz splitter as apposed to a 1 GHz? 8 Way is what I am looking into. I still am not sure about the 8 way splitter with a amplifier. Meaning they put out from what I can till about 3.5 db from each port but is it 3.5 or 3.5 onto of what is coming into the splitter if you are using a antenna amp?
Your loss is going to be the equivalence of taking a raw signal and splitting it 8 ways. 3.5 Db would only split it one way.

If for some silly reason you felt that you needed to split it 8 ways, what you need then is a distribution amplifier, not a splitter.

8 ways would be like trying to start your own cable company.

Without knowing your street level address and your antenna set up and the length of wire in your system, there is no way for us to give you anything more then a uneducated guess as to what it would do to your reception.
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Old 12-26-2009, 02:24 AM   #6
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Yes, you will have to be more specific to the actual situation you are in...are you taking output from an antenna and trying to split it to 8 (?) TV's? Or 8 apartments? Or is it cable or sat? As said, a 1 Ghz is fine for OTA, if cable is being used you might want to go to 2 Ghz, but here I am guessing again.
Describe the entire project.
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Old 12-26-2009, 08:26 AM   #7
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Yes, you will have to be more specific to the actual situation you are in...are you taking output from an antenna and trying to split it to 8 (?) TV's? Or 8 apartments? Or is it cable or sat? As said, a 1 Ghz is fine for OTA, if cable is being used you might want to go to 2 Ghz, but here I am guessing again.
Describe the entire project.
What I am interested in doing is to run a cable service to (8) different wall service locations in my house. Two of the cable runs would be 50', two at 20', two at 15', one at 10', one at 20'. The 8 way splitter would be mounted just after my Katz amplifier which is now set a 20db output. I am thinking that a 8 way distribution amplifier but (IF) that is the case which one? Now just to add frosting on the cake, each of these cable runs would be off of a diplexer from my Dish Network DPP44 Switch and the 8 way splitter into the wall outlet and then another diplexer.
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Old 12-26-2009, 11:30 AM   #8
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What I am interested in doing is to run a cable service to (8) different wall service locations in my house. Two of the cable runs would be 50', two at 20', two at 15', one at 10', one at 20'. The 8 way splitter would be mounted just after my Katz amplifier which is now set a 20db output. I am thinking that a 8 way distribution amplifier but (IF) that is the case which one? Now just to add frosting on the cake, each of these cable runs would be off of a diplexer from my Dish Network DPP44 Switch and the 8 way splitter into the wall outlet and then another diplexer.
Again, I can only make generalizations, but if your reception is coming from a outdoors antenna, then splitting it 8 ways is not a good idea, unless you live in a city and the signals are fairly strong.

Diplexers - in general are power hogs and you loose half the signal inside of it. Without a proper address, there is no way to give advice for your situation.

You know that if you only have one receiver that you can only watch one channel at a time with a Sat Dish.

I am not impressed with most amplifiers except pre amplifiers.

Using some type of integrated amplifier usually just injects more noise into the situation and does not really help out reception.

Maybe I am not understanding what you are trying to do or guessing in the wrong direction.

Two cable runs at 50' = 100 feet of wire, two at 20 = 40, two at 15 = 30, one at 10 and one at 30 = 30.

The total system run is 200 feet. No matter if the televisions are on or off the loss rate for the entire system would be the loss at X frequency at 200 feet. If the loss rate of your wire is 7 Db at 700 Mhz - the upper end of channel 51, which is the highest channel transmitted over air then you would have 14 db of loss before adding in the loss rate of the splitter.

http://www.tvtower.com/Commercial%20...equencies.html

A 8 way splitter would have the effect of taking a signal and splitting it 8 ways, or a loss of about say 26 db.

26 + 14 = 40 db of loss in your entire system.

I doubt if you are going to find a pre amplifier with more then 26 db with a low noise factor, so the distribution amplifier after the pre amplifier would have to be very quiet to work the way you intend.

I would try this one - http://www.solidsignal.com/pview.asp...u=020572034180

Solid Signal has a very good return policy and I have never had a problem with their customer service dept.
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Old 12-26-2009, 01:17 PM   #9
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Again, I can only make generalizations, but if your reception is coming from a outdoors antenna, then splitting it 8 ways is not a good idea, unless you live in a city and the signals are fairly strong.

Diplexers - in general are power hogs and you loose half the signal inside of it. Without a proper address, there is no way to give advice for your situation.

You know that if you only have one receiver that you can only watch one channel at a time with a Sat Dish.

I am not impressed with most amplifiers except pre amplifiers.

Using some type of integrated amplifier usually just injects more noise into the situation and does not really help out reception.

Maybe I am not understanding what you are trying to do or guessing in the wrong direction.

Two cable runs at 50' = 100 feet of wire, two at 20 = 40, two at 15 = 30, one at 10 and one at 30 = 30.

The total system run is 200 feet. No matter if the televisions are on or off the loss rate for the entire system would be the loss at X frequency at 200 feet. If the loss rate of your wire is 7 Db at 700 Mhz - the upper end of channel 51, which is the highest channel transmitted over air then you would have 14 db of loss before adding in the loss rate of the splitter.

http://www.tvtower.com/Commercial%20...equencies.html

A 8 way splitter would have the effect of taking a signal and splitting it 8 ways, or a loss of about say 26 db.

26 + 14 = 40 db of loss in your entire system.

I doubt if you are going to find a pre amplifier with more then 26 db with a low noise factor, so the distribution amplifier after the pre amplifier would have to be very quiet to work the way you intend.

I would try this one - http://www.solidsignal.com/pview.asp...u=020572034180

Solid Signal has a very good return policy and I have never had a problem with their customer service dept.
My Zip code is 68354 = Location
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Old 12-26-2009, 01:42 PM   #10
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Firstly, there is nothing wrong with trying to service 8 locations.

Quote:
JB Antennaman:
Diplexers - in general are power hogs and you loose half the signal inside of it.
To my understanding this is not correct: They are similar to a UVSJ or HLSJ in that they are filtered, and you only suffer the actual insertion loss of the unit itself, or ~0.5dB. Since he will be using two (one to combine and another to separate at his TVs) we can figure on ~1.0dB loss for these...

Quote:
The total system run is 200 feet. No matter if the televisions are on or off the loss rate for the entire system would be the loss at X frequency at 200 feet.
Also wrong: His longest cable run is 50', thus incurring 3~3.5dB loss @ 700 MHz. Why would you add all the cable in the system together??? Didn't we go thru this once before?

Quote:
A 8 way splitter would have the effect of taking a signal and splitting it 8 ways, or a loss of about say 26 db.
And we have a tri-fecta!
dB = 10*LOG (Pwr In/ Pwr Out)
An 8-way division is 9.03dB before insertion loss of the device itself, which we can assume to be in the neighborhood of ~1.5dB. So the total loss on the splitter is ~10.5dB

The way I see it he needs to make up for ~15dB of distribution losses, worst case. (Plus some given amount of cable from the antenna to the 8-way, which he didn't mention.)
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Old 12-26-2009, 02:00 PM   #11
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Diplexers are not "power hogs". They are low-loss devices, usually under 2 dB and often better for the design pass-band. The devices commonly known as the UVSJ, the HLSJ, and TV/SAT diplexer are just three specific examples of diplexers.

An 8-way passive splitter should be around 11 dB loss per port, not 26.

A decent quality RG6 100' long would drop around 6 dB at 700 Mhz, about the highest frequency now of interest for OTA reception.

For someone who claims to know so much about this stuff, you sure got the basics wrong....

Last edited by projectsho89; 12-26-2009 at 02:28 PM.
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Old 12-26-2009, 02:06 PM   #12
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It would be for OTA. Would there be some reason not to use a 2 GHz splitter as apposed to a 1 GHz? 8 Way is what I am looking into. I still am not sure about the 8 way splitter with a amplifier. Meaning they put out from what I can till about 3.5 db from each port but is it 3.5 or 3.5 onto of what is coming into the splitter if you are using a antenna amp?
An 8-way distribution amp with 3.5 dB gain per port would provide output so you could drive 60' (or so) of cable (on all 8 ports) and still a signal level about the same at the end of that run the same as the input to the amplifier was. Internally, it's just an amplifier with around 15-16 dB gain and an eight port passive splitter.

Have you considered a 3X8 (or similar) satellite multi-switch? You can feed the amplified (if necessary) antenna signal straight into it then only need a TV/Sat diplexer at each destination port. I'm not versed (at all) on Dish systems, so I don't know if there's a suitable one for your specific equipment.

Last edited by projectsho89; 12-26-2009 at 02:31 PM.
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Old 12-26-2009, 09:59 PM   #13
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I think some people needs to go back to school or do some reading.

When doing a link budget, you add together all loss.

Any wire connected to the system after the splitter is added to the equation due to the fact that it becomes a drag on the system.

As I have said before, so I will say again, it does not matter if the televisions are turned on or not, the wire connected to the system drags down the system and the loss inside of the splitter, not looked at from the perspective of one port, but as a whole - is a lot more then 10 Db of loss.

Duplexers by design have a 3db loss ( 1/2 the power). If your were in a high signal area for the over the air tv a duplexer would be fine, but where you are you need all the signal at the receiver (tv) that you can get, loosing half the signal is not a good thing.

http://www.hdtvprimer.com/ANTENNAS/G...ml#capacitance

http://www.hdtvprimer.com/ANTENNAS/basics.html

http://www.hdtvprimer.com/ANTENNAS/G...html#splitters

This is what they say, but I do not believe it! - "This device will allow a satellite dish and an over-the-air antenna to share the same cable. The loss in the device will not be 3dB, but there will be some small loss".

Anytime you make or break a connector, you will have a loss of about 1 DB, 2 connectors - 2 Db etc... A diplexer cannot amplify something when it is not powered to begin with - like a amplifier.

As I have said before, so I will say again. A street level address is needed to look at your situation, not a generic zip code.

Even the street level address will not show trees that grew or buildings that were built after the Google Earth pictures were took.
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Old 12-27-2009, 06:08 AM   #14
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My goodness, Cush, I do believe you've opened a can of worms here....
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Old 12-27-2009, 07:59 AM   #15
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Yes, someone DOES need to go back to school.

Why do you keep bringing up "duplexers"? They are not the subject under discussion. This discussion is about splitters and, to some extent, diplexers. "Duplexers", yet another type of device, are not under discussion

A link budget must be done from the signal origin point to the destination point for each specific path the signal must travel. A short signal path with minimal lossy devices does not "drag down" the rest of the paths when there are multiple paths. The losses in parallel cable paths are not summed with each after the splitter, they must be calculated separately for each path after the splitter and then summed with the common "upstream" losses.

Quote:
This is what they say, but I do not believe it! - "This device will allow a satellite dish and an over-the-air antenna to share the same cable. The loss in the device will not be 3dB, but there will be some small loss".
Go do some dedicated research on diplexers. Just because you don't believe it ( a minority of one), doesn't mean it isn't correct (which it is).

Last edited by projectsho89; 12-27-2009 at 08:19 AM.
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