Thank you in advance for your help.
I have been having terrible problems with my cable modem dropping its connection. When it drops, the modem thinks the cable isn’t plugged in. I’ve called the cable company techs and they can’t see the modem at all when this happens. Unplugging the modem and plugging it back in usually doesn’t help though unplugging the actual coax and then plugging it back in often does. It will usually reconnect in a matter of hours if nothing is done.
The problem started when I got my Avermedia Combo PC tuner card and installed a 4-way splitter to accommodate it.
This is what I have found out:
Cable wiring – The cable comes out of the drop box and goes to the roof where it is split once with a low quality splitter. One cable, the irrelevant one to this posting, goes to the second bedroom and the other relevant one winds around the roof and eventually into the wall where it comes out in the living room. The cable run is probably 75 – 125 feet from the drop box on the side of the house by the time it pokes through the living room wall. At this point, the living room cable is split via a Monster 2400mhz 4-way splitter where it is fed into a cable modem, HDTV, and two PC tuner ports.
It turns out that the dropped cable modem internet is probably due to the long cable run and 2-way + 4-way splitters in the path. Here are my cable modem measurements with the setup described:
Signal to Noise Ratio: 35.6 dB
Power Level: -10.4 dBmV
Power: 51.2 dBmV
Talking with the cable company, it seems that the appropriate Downstream Power Level should be between 0 and -10 and upstream should be between 40 and 50. A downstream of -10.4 is weaker than what it should be and Upstream of 51.2 is likewise not strong enough. This would explain why the problem was introduced with the introduction of the 4-way splitter. When using the same setup with the only difference being a 2-way splitter in the living room the readings were:
Signal to Noise Ratio: 36.4 dB
Power Level: -7.1 dBmV
Power: 47.4 dBmV
These readings are all within normal tolerances.
As a result of this, I rewired my cable. The drop box is on the exterior of the living room wall. I made a hole near the drop box directly into the living room.
The cable now runs as follows:
Drop box --> through the wall on a 10 foot cable --> High quality 2-Way 2400mhz splitter
2-Way splitter Output 1 --> Goes to Cable modem on 6 ft RG6
2-Way splitter Output 2 --> Goes to input on PCT 1 Port +15db Amplifier
--> Monster 2400mhz 4-way splitter --> HDTV, 2 to PC tuner
4-Way splitter Output 4 --> Uses the old cable to the roof to connect to the second bedroom
With this new setup, everything has been running smoothly so far, though I have just installed it today so only time will tell. The cable modem is now only separated from the drop box by 10 feet of cable and one 2-way splitter as supposed to between 75 and 125 feet of cable, a 2-way splitter , and a 4-way splitter.
The new readings are
Signal to Noise Ratio: 37.1 dB
Power Level: 1.3 dBmV
Power: 42.7 dBmV
Here’s my question: When I originally purchased the PCT amplifier two days ago, I imagined it running the lengths of cable as it was previously setup (to the roof, splitter, long cable, living room, splitter). This is why I purchased the one port version. There was only one cable running to the roof. All the splitting was done up there.
It was only while I was impatiently waiting that I decided to drill the hole in the wall and came upon my newer, superior cable run setup.
I can still return the PCT amplifier. How much benefit would I get by returning the 1 port amplifier and purchasing the four port version instead?
Is there any difference between 1 Port Drop Amp
--> 4-way splitter vs. 4
Port drop amp
Is there a loss because there is an extra cable involved in the 1 Port Drop Amp
--> 4-way splitter setup
Is it worth returning the 1 Port version
for the 4-Port?
Thank you for all of your help.