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Can someone tell me the difference between a Directional coupler and splitter..

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Old 05-12-2007, 12:27 PM   #1
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Default Can someone tell me the difference between a Directional coupler and splitter..

in layman's terms? I assume they are not the same. I have HDTV and Roadrunner through TWC coming into my apartment. It hits a Directional Coupler where I assume the cable modem feed runs off. The other output goes to a 4-way splitter in another room(although I only count 3 cable TV connections in my entire apartment).

Since I have a TV close to my computer, I split the signal from the coupler before it goes to my cable modem. Should I be using a Directional coupler here instead of a splitter?

I also seem to have a problem getting a 1080i signal on my HDTV the furthest away from where the cable enters the apartment (longest run). 720p is fine but when I use 1080i, TV has good signal for a few minutes and then starts to shake and then signal becomes intermittent and unwatchable. My other two locations get 1080i signals fine. My cable company tells me my problem is with my TV but I kind of doubt that. I had problems with BOTH 720p and 1080i signals for years and only recently did TWC admit that they had infrastructure issues and they were upgrading the system, so I only had good HD cable for about 6 months.

So do you think the 1080i problem with the long run has to do with weak signal strength? Would replacing the 1GHz splitter with a 2GHz splitter help? If not, a bi-directional signal booster?

Thanks much in advance for your responses!
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Old 05-12-2007, 02:43 PM   #2
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The 2 ghz splitter could help but not because of the extra bandwidth, but because of most 2 ghz splitters have less loss than 1 ghz splitters. Find a low loss splitter. Also a bi-directional amp could help your situation.

As far as the difference in the directional coupler and a splitter, maybe one of the cable guys will chime in.
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Old 05-12-2007, 04:10 PM   #3
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A directional coupler taps part of the available signal to the outlet, while a spiltter is a device that takes a signal and splits it in 1/2 and each leg is reduced by 50 percent from the input in a two way splitter.

The Directional Coupler, allows the 'trunk' signal to pass thru with minimum loss and the tap being a value needed to achieve the proper level to the device.
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Old 05-12-2007, 04:41 PM   #4
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Thanks dick, and welcome to the forum.

I guess that insures the larger signal is dedicated to the internet modem and it would actually hurt the signal path that feeds the TV.
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Old 05-12-2007, 08:13 PM   #5
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Quote:
Originally Posted by rbinck View Post
Thanks dick, and welcome to the forum.

I guess that insures the larger signal is dedicated to the internet modem and it would actually hurt the signal path that feeds the TV.
Your right, the modem requires a higher signal for error free operation.

Aside from being in TV I spent 7 years in the cable industry as a supervisor of head end operations for GE Cable, so splitters and DC's are something I worked with daily.

Thank you, the group is very good, I have been lurking for a while. Just purchased a Samsung DLP 71" to enjoy the HD programming.
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Old 05-13-2007, 09:58 AM   #6
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Quote:
Originally Posted by dick890 View Post
Your right, the modem requires a higher signal for error free operation.

Aside from being in TV I spent 7 years in the cable industry as a supervisor of head end operations for GE Cable, so splitters and DC's are something I worked with daily.

Thank you, the group is very good, I have been lurking for a while. Just purchased a Samsung DLP 71" to enjoy the HD programming.
Thanks for the explanation. SO that means the tap goes to my cable tv and the trunk to my cable modem?

Well, I guess I'll start by getting a 2GHz splitter for my cable connections and then work my way up if that doesn't work. Thanks very much.

Last edited by rhony2; 05-13-2007 at 10:02 AM.
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