joerizo
join:2008-12-07
Keller, TX
|  [ONT] Adding Digital Adapters and use of Splitters/Amplifiers
Hello All,
I have read several threads regarding splitters and amplifiers, but none have really addresses my overall requirements. First off a little background.
I have a fairly large property with more than one residence. The main house is where the ONT is installed. I have a guest house/home theater at the rear of my property approximately 150' from the ONT.
Currently I have a PDI 5-1000 MHZ 8 way splitter with 12.5dB outputs each that I am assuming was installed by Verizon. Off of this splitter I have:
1 Router
2 HDTV DVR
3 HDTV DVR
4 SD STB
5 SD STB
6 HDTV DVR (150' Cable run)
7 Digital Adapter Output (discussed below)
8 Unused, but with 75ohm terminator
Up until this past week I had been using Charter for my analog output to the guest house. Now that I am starting my move to Digital I ordered and received a Digital Adapter from Verizon. I was told that I could install as many of these as I wanted to. I need to install 3 to start off with, but I am doing my testing with just the one I received.
I would like to run leg leg #7 above to a splitter that will run 3 digital adapters. The run is long (150') so it looks like this: 8-way -> 150' cable -> 3-way - 30' cable to each TV and digital adapter.
The problem I have is that my 3 way splitter will only work if I use the 3.5dB output. I can't get the adapter to work off the 7dB output. I tried to use a 2-way splitter off the main cable run, but no joy there.
Anyway, I need help in designing this thing the right way.
How can I split that 12.5dB output to support 3 digital adapters?
Should I be using an amp on the digital adapter leg to support the 3 TVs?
Thanks for your help.
Joe |
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keyboards
join:2001-02-14
Doylestown, PA
 ·Verizon FIOS
 ·Comcast
| Re: [ONT] Adding Digital Adapters and use of Splitters/Amplifier
Unless I misunderstood your configuration I believe you have 2 options:
1 - If you are only using digital adapters then you can use an amplifier on that leg since they do not require the MOCA signal.
2 - Your other option would be to change the splitting at the ONT to a 2-way splitter with one leg running the 150' and the other going to a 6-way splitter. Now you should be able to place a 4-way on the end of the 150' run to feed tour 3 adapters and the HDTV DVR.
The first option might be best since I don't know the input sensitivity of the adapters and there will be loss at the high frequencies due to the long coax run (I assume that the long runs are RG-6 - RG-11 would be better, but not easily done in a home setting).
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REMEMBER: Stupidity should be painful !! |
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GeekGirl1
The Medium IS the Message
Premium
join:2007-01-28
Morrisville, PA
4 edits | Take a look at the discussion over in this thread: »10 way splitter
There's enough info in that thread for you to figure it out. You're starting with an 8-way divider (12 dB drop), an ONT of +18 dBmV output power and need to get about + 5 dBmV to the adapter.
The thread includes links to coax loss calculators.
Update:
That run of 180' total (150' + 30') to the digital adapters looks about 11 dB of loss using RG-6/U (even more with RG-59). With your 8-way divider, that brings the total loss to about 21 dB (11 dB + 10 dB (approx.)) for the coax and 8-way divider.
That brings the signal level to about -3 dBmV = +18 dBmV - 21 dB, which is already on the low end of working. Adding that extra 3 dB splitter pushes it off the bottom end and explains why the adapter is not happy.
Can you re-arrange your 8-way divider to free up another input? That would give you the 3 outputs needed for your digital adapters. Critial here is that the router can easily be put on the same leg as one of your other DVRs with a splitter. It doesn't need a dedicated output.
Alternative:
1 HDTV DVR + Router (add splitter here)
2 HDTV DVR
3 SD STB
4 SD STB
5 HDTV DVR (150' Cable Run)
6 Digital Adapter #1 (180' Run)
7 Digital Adapter #2 (180' Run)
8 Digital Adapter #3 (180' Run)
Update: After looking at Keyboards' option 2, this configuration is not as good. Suggest using the 2-way, as adding an amplifier is much more costly and you'll need to find a spot to mount it near AC power. |
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